NEWS.md

ClamAV News

Note: This file refers to the source tarball. Things described here may differ slightly from the binary packages.

0.103.5

ClamAV 0.103.5 is a critical patch release with the following fixes:

• CVE-2022-20698: Fix for invalid pointer read that may cause a crash. Affects 0.104.1, 0.103.4 and prior when ClamAV is compiled with libjson-c and the CL_SCAN_GENERAL_COLLECT_METADATA scan option (the clamscan --gen-json option) is enabled.

  Cisco would like to thank Laurent Delosieres of ManoMano for reporting this vulnerability.

• Fixed ability to disable the file size limit with libclamav C API, like this:

    cl_engine_set_num(engine, CL_ENGINE_MAX_FILESIZE, 0);

  This issue didn't impact ClamD or ClamScan which also can disable the limit by setting it to zero using MaxFileSize 0 in clamd.conf for ClamD, or clamscan --max-filesize=0 for ClamScan.

  Note: Internally, the max file size is still set to 2 GiB. Disabling the limit for a scan will fall back on the internal 2 GiB limitation.

• Increased the maximum line length for ClamAV config files from 512 bytes to 1024 bytes to allow for longer config option strings.

• SigTool: Fix insufficient buffer size for --list-sigs that caused a failure when listing a database containing one or more very long signatures. This fix was backported from 0.104.

Special thanks to the following for code contributions and bug reports:

• Laurent Delosieres

0.103.4

ClamAV 0.103.4 is a critical patch release with the following fixes:

• FreshClam:

  • Add a 24-hour cool-down for FreshClam clients that have received an HTTP 403 (Forbidden) response from the CDN. This is to reduce the volume of 403-response data served to blocked FreshClam clients that are configured with a tight update-loop.
  • Fixed a bug where FreshClam treats an empty CDIFF as an incremental update failure instead of as an intentional request to download the whole CVD.

• ClamDScan: Fix a scan error when broken symlinks are encountered on macOS with "FollowDirectorySymlinks" and "FollowFileSymlinks" options disabled.

• Overhauled the scan recursion / nested archive extraction logic and added new limits on embedded file-type recognition performed during the "raw" scan of each file. This limits embedded file-type misidentification and prevents detecting embedded file content that is found/extracted and scanned at other layers in the scanning process.

• Fix an issue with the FMap module that failed to read from some nested files.

• Fixed an issue where failing to load some rules from a Yara file containing multiple rules may cause a crash.

• Fixed assorted compiler warnings.

• Fixed assorted Coverity static code analysis issues.

• Scan limits:

  • Added virus-name suffixes to the alerts that trigger when a scan limit has been exceeded. Rather than simply Heuristics.Limits.Exceeded, you may now see limit-specific virus-names, to include:
    • Heuristics.Limits.Exceeded.MaxFileSize
    • Heuristics.Limits.Exceeded.MaxScanSize
    • Heuristics.Limits.Exceeded.MaxFiles
    • Heuristics.Limits.Exceeded.MaxRecursion
    • Heuristics.Limits.Exceeded.MaxScanTime
  • Renamed the Heuristics.Email.ExceedsMax.* alerts to align with the other limit alerts names. These alerts include:
    • Heuristics.Limits.Exceeded.EmailLineFoldcnt
    • Heuristics.Limits.Exceeded.EmailHeaderBytes
    • Heuristics.Limits.Exceeded.EmailHeaders
    • Heuristics.Limits.Exceeded.EmailMIMEPartsPerMessage
    • Heuristics.Limits.Exceeded.EmailMIMEArguments
  • Fixed an issue where the Email-related scan limits would alert even when the "AlertExceedsMax" (--alert-exceeds-max) scan option is not enabled.
  • Fixes an issue in the Zip parser where exceeding the "MaxFiles" limit or the "MaxFileSize" limit would abort the scan but would fail to alert. The Zip scan limit issues were independently identified and reported by Aaron Leliaert and Max Allan.

• Fixed a leak in the Email parser when using the --gen-json scan option.

• Fixed an issue where a failure to record metadata in the Email parser when using the --gen-json scan option could cause the Email parser to abort the scan early and fail to extract and scan additional content.

• Fixed a file name memory leak in the Zip parser.

• Fixed an issue where certain signature patterns may cause a crash or cause unintended matches on some systems when converting characters to uppercase if a UTF-8 unicode single-byte grapheme becomes a multi-byte grapheme. Patch courtesy of Andrea De Pasquale.

Other fixes backported from 0.104.0:

• Fixed a crash in programs that use libclamav when the programs don't set a callback for the "virus found" event. Patch courtesy of Markus Strehle.

• Added checks to the the SIS archive parser to prevent an SIS file entry from pointing to the archive, which would result in a loop. This was not an actual infinite loop, as ClamAV's scan recursion limit limits the depth of nested archive extraction.

• ClamOnAcc: Fixed a socket file descriptor leak that could result in a crash when all available file descriptors are exhausted.

• FreshClam: Fixed an issue where FreshClam would download a CVD repeatedly if a zero-byte CDIFF is downloaded or if the incremental update failed and if the CVD downloaded after that is older than advertised. Patch courtesy of Andrew Williams.

• ClamDScan:

  • Fixed a memory leak of the scan target filename when using the --fdpass or --stream options.
  • Fixed an issue where ClamDScan would fail to scan any file after excluding a file with the "ExcludePath" option when using when using the --multiscan (-m) option along with either --fdpass or --stream. Also fixed a memory leak of the accidentally-excluded paths in this case.
  • Fixed a single file path memory leak when using --fdpass.
  • Fixed an issue where the "ExcludePath" regex may fail to exclude absolute paths when the scan is invoked with a relative path.

Special thanks to the following for code contributions and bug reports:

• Aaron Leliaert
• Andrea De Pasquale
• Andrew Williams
• Markus Strehle
• Max Allan

0.103.3

ClamAV 0.103.3 is a patch release with the following fixes:

• Fixed a scan performance issue when ENGINE_OPTIONS_FORCE_TO_DISK is enabled. This issue did not impacted most users but for those affected it caused every scanned file to be copied to the temp directory before the scan.

• Fix ClamDScan crashes when using the --fdpass --multiscan command-line options in combination with the ClamD ExcludePath config file options.

• Fixed an issue where the mirrors.dat file is owned by root when starting as root (or with sudo) and using daemon-mode. File ownership will be set to the DatabaseOwner just before FreshClam switches to run as that user.

• Renamed the mirrors.dat file to freshclam.dat.

  We used to recommend deleting mirrors.dat if FreshClam failed to update. This is because mirrors.dat used to keep track of offline mirrors and network interruptions were known to cause FreshClam to think that all mirrors were offline. ClamAV now uses a paid CDN instead of a mirror network, and the new FreshClam DAT file no longer stores that kind of information. The UUID used in ClamAV's HTTP User-Agent is stored in the FreshClam DAT file and we want the UUID to persist between runs, even if there was a failure.

  Unfortunately, some users have FreshClam configured to automatically delete mirrors.dat if FreshClam failed. Renaming mirrors.dat to freshclam.dat should make it so those scripts don't delete important FreshClam data.

• Disabled the HTTPUserAgent config option if the DatabaseMirror uses clamav.net. This will prevent users from being inadvertently blocked and will ensure that we can keep better metrics on which ClamAV versions are being used.

  This change effectively deprecates the HTTPUserAgent option for most users.

• Moved the detection for Heuristics.PNG.CVE-2010-1205 behind the ClamScan --alert-broken-media option (ClamD AlertBrokenMedia yes) option. This type of PNG issue appears to be common enough to be an annoyance, and the CVE is old enough that no one should be vulnerable at this point.

• Fix ClamSubmit failures after changes to Cloudflare "__cfduid" cookies. See: https://blog.cloudflare.com/deprecating-cfduid-cookie/

Special thanks to the following for code contributions and bug reports:

• Stephen Agate
• Tom Briden

0.103.2

ClamAV 0.103.2 is a security patch release with the following fixes:

• CVE-2021-1386: Fix for UnRAR DLL load privilege escalation. Affects 0.103.1 and prior on Windows only.

• CVE-2021-1252: Fix for Excel XLM parser infinite loop. Affects 0.103.0 and 0.103.1 only.

• CVE-2021-1404: Fix for PDF parser buffer over-read; possible crash. Affects 0.103.0 and 0.103.1 only.

• CVE-2021-1405: Fix for mail parser NULL-dereference crash. Affects 0.103.1 and prior.

• Fix possible memory leak in PNG parser.

• Fix ClamOnAcc scan on file-creation race condition so files are scanned after their contents are written.

• FreshClam: Deprecate the SafeBrowsing config option. The SafeBrowsing option will no longer do anything.

  For more details, see: https://blog.clamav.net/2020/06/the-future-of-clamav-safebrowsing.html

  Tip: If creating and hosting your own safebrowing.gdb database, you can use the DatabaseCustomURL option in freshclam.conf to download it.

• FreshClam: Improved HTTP 304, 403, & 429 handling.

• FreshClam: Add back the mirrors.dat file to the database directory. This new mirrors.dat file will store:

  • A randomly generated UUID for the FreshClam User-Agent.
  • A retry-after timestamp that so FreshClam won't try to update after having received an HTTP 429 response until the Retry-After timeout has expired.

• FreshClam will now exit with a failure in daemon mode if an HTTP 403 (Forbidden) was received, because retrying later won't help any. The FreshClam user will have to take actions to get unblocked.

• Fix the FreshClam mirror-sync issue where a downloaded database is "older than the version advertised."

  If a new CVD download gets a version that is older than advertised, FreshClam will keep the older version and retry the update so that the incremental update process (CDIFF patch process) will update to the latest version.

0.103.1

ClamAV 0.103.1 is a patch release with the following fixes and improvements.

Notable changes

• Added a new scan option to alert on broken media (graphics) file formats. This feature mitigates the risk of malformed media files intended to exploit vulnerabilities in other software. At present media validation exists for JPEG, TIFF, PNG, and GIF files. To enable this feature, set AlertBrokenMedia yes in clamd.conf, or use the --alert-broken-media option when using clamscan. These options are disabled by default in this patch release, but may be enabled in a subsequent release. Application developers may enable this scan option by enabling CL_SCAN_HEURISTIC_BROKEN_MEDIA for the heuristic scan option bit field.

• Added CL_TYPE_TIFF, CL_TYPE_JPEG types to match GIF, PNG typing behavior. BMP and JPEG 2000 files will continue to detect as CL_TYPE_GRAPHICS because ClamAV does not yet have BMP or JPEG 2000 format checking capabilities.

Bug fixes

• Fixed PNG parser logic bugs that caused an excess of parsing errors and fixed a stack exhaustion issue affecting some systems when scanning PNG files. PNG file type detection was disabled via signature database update for ClamAV version 0.103.0 to mitigate the effects from these bugs.

• Fixed an issue where PNG and GIF files no longer work with Target:5 graphics signatures if detected as CL_TYPE_PNG/GIF rather than as CL_TYPE_GRAPHICS. Target types now support up to 10 possible file types to make way for additional graphics types in future releases.

• Fixed clamonacc's --fdpass option.

  File descriptor passing (or "fd-passing") is a mechanism by which clamonacc and clamdscan may transfer an open file to clamd to scan, even if clamd is running as a non-privileged user and wouldn't otherwise have read-access to the file. This enables clamd to scan all files without having to run clamd as root. If possible, clamd should never be run as root so as to mitigate the risk in case clamd is somehow compromised while scanning malware.

  Interprocess file descriptor passing for clamonacc was broken since version 0.102.0 due to a bug introduced by the switch to curl for communicating with clamd. On Linux, passing file descriptors from one process to another is handled by the kernel, so we reverted clamonacc to use standard system calls for socket communication when fd passing is enabled.

• Fixed a clamonacc stack corruption issue on some systems when using an older version of libcurl. Patch courtesy of Emilio Pozuelo Monfort.

• Allow clamscan and clamdscan scans to proceed even if the realpath lookup failed. This alleviates an issue on Windows scanning files hosted on file- systems that do not support the GetMappedFileNameW() API such as on ImDisk RAM-disks.

• Fixed freshclam --on-update-execute=EXIT_1 temporary directory cleanup issue.

• clamd's log output and VirusEvent now provide the scan target's file path instead of a file descriptor. The clamd socket API for submitting a scan by FD-passing doesn't include a file path, this feature works by looking up the file path by file descriptor. This feature works on Mac and Linux but is not yet implemented for other UNIX operating systems. FD-passing is not available for Windows.

• Fixed an issue where freshclam database validation didn't work correctly when run in daemon mode on Linux/Unix.

Other improvements

• Scanning JPEG, TIFF, PNG, and GIF files will no longer return "parse" errors when file format validation fails. Instead, the scan will alert with the "Heuristics.Broken.Media" signature prefix and a descriptive suffix to indicate the issue, provided that the "alert broken media" feature is enabled.

• GIF format validation will no longer fail if the GIF image is missing the trailer byte, as this appears to be a relatively common issue in otherwise functional GIF files.

• Added a TIFF dynamic configuration (DCONF) option, which was missing. This will allow us to disable TIFF format validation via signature database update in the event that it proves to be problematic. This feature already exists for many other file types.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Emilio Pozuelo Monfort

0.103.0

ClamAV 0.103.0 includes the following improvements and changes.

Major changes

• Clamd can now reload the signature database without blocking scanning. This multi-threaded database reload improvement was made possible thanks to a community effort.

  Non-blocking database reloads are now the default behavior. Some systems that are more contrained on RAM may need to disable non-blocking reloads as it will temporarily consume 2x as much memory. For this purpose we have added a new clamd config option ConcurrentDatabaseReload which may be set to no.

  Special thanks to the following for making this feature a reality:

  • Alberto Wu
  • Alexander Sulfrian
  • Arjen de Korte
  • David Heidelberg
  • Ged Haywood
  • Julius Plenz
  • Michael Orlitzky

  Thank you all for your patience waiting for this feature.

Notable changes

• The DLP module has been enhanced with additional credit card ranges and a new engine option which allows ClamAV to alert only on credit cards (and not, for instance, gift cards) when scannning with the DLP module. This feature enhancement was made by John Schember, with input from Alexander Sulfrian.

• Support for Adobe Reader X PDF encryption, an overhaul of PNG scanning to detect PNG specific exploits, and a major change to GIF parsing which makes it more tolerant to problematic files and adds the ability to scan overlays, all thanks to work and patches submitted by Aldo Mazzeo.

• clamdtop.exe now available for Windows users. Functionality is somewhat limited when compared with clamdtop on Linux. PDCurses is required to build clamdtop.exe for ClamAV on Windows.

• The phishing detection module will now print "Suspicious link found!" along with the "Real URL" and "Display URL" each time phishing is detected. In a future version, we would like to print out alert-related metadata like this at the end of a scan, but for now this detail will help users understand why a given file is being flagged as phishing.

• Added new experimental CMake build tooling. CMake is not yet recommended for production builds. Our team would appreciate any assistance improving the CMake build tooling so we can one day deprecate Autotools and remove the Visual Studio solutions.

  Please see the new CMake installation instructions for detailed instructions on how to build ClamAV with CMake.

• Added --ping and --wait options to the clamdscan and clamonacc client applications.

  The --ping (-p) command will attempt to ping clamd up to a specified maximum number of attempts at an optional interval. If the interval isn't specified, a default 1-second interval is used. It will exit with status code 0 when it receives a PONG from clamd or status code 21 if the timeout expires before it receives a response.

  Example: clamdscan -p 120 will attempt to ping clamd 120 at a 1 second interval.

  The --wait (-w) command will wait up to 30 seconds for clamd to start. This option may be used in tandem with the --ping option to customize the max # of attempts and the attempt interval. As with --ping, the scanning client may exit with status code 21 if the timeout expires before a connection is made to clamd.

  Example: clamdscan -p 30:2 -w <file> will attempt a scan, waiting up to 60 seconds for clamd to start and receive the scan request.

  The ping-and-wait feature is particularly useful for those wishing to start clamd and start clamonacc at startup, ensuring that clamd is ready before clamonacc starts. It is also useful for those wishing to start clamd immediately before initiating scans with clamdscan rather than having the clamd service run continuously.

• Added Excel 4.0 (XLM) macro detection and extraction support. Significantly improved VBA detection and extraction as well. Work courtesy of Jonas Zaddach.

  This support not yet added to sigtool, as the VBA extraction feature in sigtool is separate from the one used for scanning and will still need to be updated or replaced in the future.

• Improvements to the layout and legitibility of temp files created during a scan. Improvements to legitibility and content of the metadata JSON generated during a scan.

  To review the scan temp files and metadata JSON, run:

  clamscan --tempdir=<path> --leave-temps --gen-json <target>

  Viewing the scan temp files and metadata.json file provides some insight into how ClamAV analyzes a given file and can also be useful to analysts for initial triage of potentially malicious files.

Other improvements

• Added ability for freshclam and clamsubmit to override default use of openssl CA bundle with a custom CA bundle. On Linux/Unix platforms (excluding macOS), users may specify a custom CA bundle by setting the CURL_CA_BUNDLE environment variable. On macOS and Windows, users are expected to add CA certificates to their respective system's keychain/certificate store. Patch courtesy of Sebastian A. Siewior

• clamscan and clamdscan now print the scan start and end dates in the scan summary.

• The clamonacc on-access scanning daemon for Linux now installs to sbin instead of bin.

• Improvements to the freshclam progress bar so the width of the text does not shift around as information changes and will not spill exceed 80-characters even on very slow connections. Time is now displayed in Xm XXs (or Xh XXm) for values of 60 seconds or more. Bytes display now changes units at the proper 1024 B/KiB instead of 2048 B/KiB. Patch courtesy of Zachary Murden.

• Improve column alignment and line wrap rendering for ClamdTOP. Also fixed an issue on Windows where ClamdTOP would occasionally disconnect from clamd and fail to reconnect. Patch courtesy of Zachary Murden.

• Improvements to the AutoIT parser.

• Loosened the curl version requirements in order to build and use clamonacc. You may now build ClamAV with any version of libcurl. However clamonacc's file descriptor-passing (FD-passing) capability will only be available with libcurl 7.40 or newer. FD-passing is ordinarily the default way to perform scans with clamonacc as it is significantly faster than streaming.

• Added LZMA and BZip2 decompression routines to the bytecode signature API.

• Disabled embedded type recognition for specific archive and disk image file types. This change reduces file type misclassification and improves scan time performance by reducing duplicated file scanning.

• Use pkg-config to detect libpcre2-8 before resorting to pcre2-config or pcre-config. Patch courtesy of Michael Orlitzky.

Bug fixes

• Fixed issue scanning directories on Windows with clamdscan.exe that was introduced when mitigating against symlink quarantine attacks.

• Fixed behavior of freshclam --quiet option. Patch courtesy of Reio Remma.

• Fixed behavior of freshclam's OnUpdateExecute, OnErrorExecute, and OnOutdatedExecute config options on Windows when in daemon-mode so it can handle multiple arguments. Patch courtesy of Zachary Murden.

• Fixed an error in the heuristic alert mechanism that would cause a single detection within an archive to alert once for every subsequent file scanned, potentially resulting in thousands of alerts for a single scan.

• Fixed clamd, clamav-milter, and freshclam to create PID files before dropping privileges, to avoid the possibility of an unprivileged user from changing the PID file so that a service manager will kill a different process. This change does make the services unable to clean up the PID file on exit.

• Fixed the false positive (.fp) signature feature. In prior versions, the hash in a false positive signature would be checked only against the current layer of a file being scanned. In 0.103, every file layer is hashed, and the hashes for each in the scan recursion list are checked. This ensures that .fp signatures containing a hash for any layer in the scan leading up to the alert will negate the alert.

  As an example, a hash for a zip containing the file which alerts would not prevent the detection in prior versions. Only the hash of the embedded file would work. For some file types where the outermost is always an archive, eg. docx files, this made .fp signatures next to useless. For certain file types where the scanned content was a normalized version of the original content, eg. HTML, the normalized version was never hashed and this meant that .fp signatures never worked.

• Fixed Trusted & Revoked Windows executable (PE) file signature rules (.crb) maximum functionality level (FLEVEL) which had been being treated as the minimum FLEVEL. These signatures enable ClamAV to trust executables that are digitally signed by trusted publishers, or to alert on executables signed with compromised signing-certificates. The minimum and maximum FLEVELS enable or disable signatures at load time depending on the current ClamAV version.

• Fixed a bug wherein you could not build ClamAV with --enable-libclamav-only if curl was not installed on the system.

• Various other bug fixes, improvements, and documentation improvements.

New Requirements

• Autotools (automake, autoconf, m4, pkg-config, libtool) are now required in order to build from a Git clone because the files generated by these tools have been removed from the Git repository. To generate theses files before you compile ClamAV, run autogen.sh. Users building with Autotools from the release tarball should be unaffected.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Aldo Mazzeo
• Ángel
• Antonino Cangialosi
• Clement Lecigne
• Jamie Biggar
• Jan Smutny
• Jim Klimov
• John Schember
• Jonathan Sabbe
• lutianxiong
• Michael Orlitzky
• Reio Remma
• Sebastian A. Siewior
• Zachary Murden

0.102.4

ClamAV 0.102.4 is a bug patch release to address the following issues.

• CVE-2020-3350: Fix a vulnerability wherein a malicious user could replace a scan target's directory with a symlink to another path to trick clamscan, clamdscan, or clamonacc into removing or moving a different file (eg. a critical system file). The issue would affect users that use the --move or --remove options for clamscan, clamdscan, and clamonacc.

  For more information about AV quarantine attacks using links, see the RACK911 Lab's report.

• CVE-2020-3327: Fix a vulnerability in the ARJ archive parsing module in ClamAV 0.102.3 that could cause a Denial-of-Service (DoS) condition. Improper bounds checking results in an out-of-bounds read which could cause a crash. The previous fix for this CVE in 0.102.3 was incomplete. This fix correctly resolves the issue.

• CVE-2020-3481: Fix a vulnerability in the EGG archive module in ClamAV 0.102.0 - 0.102.3 could cause a Denial-of-Service (DoS) condition. Improper error handling may result in a crash due to a NULL pointer dereference. This vulnerability is mitigated for those using the official ClamAV signature databases because the file type signatures in daily.cvd will not enable the EGG archive parser in versions affected by the vulnerability.

0.102.3

ClamAV 0.102.3 is a bug patch release to address the following issues.

• CVE-2020-3327: Fix a vulnerability in the ARJ archive parsing module in ClamAV 0.102.2 that could cause a Denial-of-Service (DoS) condition. Improper bounds checking of an unsigned variable results in an out-of-bounds read which causes a crash.

  Special thanks to Daehui Chang and Fady Othman for helping identify the ARJ parsing vulnerability.

• CVE-2020-3341: Fix a vulnerability in the PDF parsing module in ClamAV 0.101 - 0.102.2 that could cause a Denial-of-Service (DoS) condition. Improper size checking of a buffer used to initialize AES decryption routines results in an out-of- bounds read which may cause a crash. Bug found by OSS-Fuzz.

• Fix "Attempt to allocate 0 bytes" error when parsing some PDF documents.

• Fix a couple of minor memory leaks.

• Updated libclamunrar to UnRAR 5.9.2.

0.102.2

ClamAV 0.102.2 is a bug patch release to address the following issues.

• CVE-2020-3123: An Denial-of-Service (DoS) condition may occur when using the optional credit card data-loss-prevention (DLP) feature. Improper bounds checking of an unsigned variable resulted in an out-of-bounds read which causes a crash.

• Significantly improved scan speed of PDF files on Windows.

• Re-applied a fix to alleviate file access issues when scanning RAR files in downstream projects that use libclamav where the scanning engine is operating in a low-privelege process. This bug was originally fixed in 0.101.2 and the fix was mistakenly omitted from 0.102.0.

• Fixed an issue wherein freshclam failed to update if the database version downloaded is 1 version older than advertised. This situation may occur after a new database version is published. The issue affected users downloading the whole CVD database file.

• Changed the default freshclam ReceiveTimeout setting to 0 (infinite). The ReceiveTimeout had caused needless database update failures for users with slower internet connections.

• Correctly display number of kilobytes (KiB) in progress bar and reduced the size of the progress bar to accomodate 80-char width terminals.

• Fixed an issue where running freshclam manually causes a daemonized freshclam process to fail when it updates because the manual instance deletes the temporary download directory. FreshClam temporary files will now download to a unique directory created at the time of an update instead of using a hardcoded directory created/destroyed at the program start/exit.

• Fixed behavior of freshclam's OnOutdatedExecute config option when in foreground mode. Previously it would run the OnUpdateExecute command instead. Patch courtesy of Antoine Deschênes.

• Fixes a memory leak in the error condition handling for the email parser.

• Improved bound checking and error handling in ARJ archive parser.

• Improved error handling in PDF parser.

• Fix for memory leak in byte-compare signature handler.

• Updates to the unit test suite to support libcheck 0.13.

• Updates to support autoconf 2.69 and automake 1.15.

Special thanks to the following for code contributions and bug reports:

• Antoine Deschênes
• Eric Lindblad
• Gianluigi Tiesi
• Tuomo Soini

0.102.1

ClamAV 0.102.1 is a security patch release to address the following issues.

• Fix for the following vulnerability affecting 0.102.0 and 0.101.4 and prior:

  • CVE-2019-15961 A Denial-of-Service (DoS) vulnerability may occur when scanning a specially crafted email file as a result of excessively long scan times. The issue is resolved by implementing several maximums in parsing MIME messages and by optimizing use of memory allocation.

• Build system fixes to build clamav-milter, to correctly link with libxml2 when detected, and to correctly detect fanotify for on-access scanning feature support.

• Signature load time is significantly reduced by changing to a more efficient algorithm for loading signature patterns and allocating the AC trie. Patch courtesy of Alberto Wu.

• Introduced a new configure option to statically link libjson-c with libclamav. Static linking with libjson is highly recommended to prevent crashes in applications that use libclamav alongside another JSON parsing library.

• Null-dereference fix in email parser when using the --gen-json metadata option.

• Fixes for Authenticode parsing and certificate signature (.crb database) bugs.

Special thanks to the following for code contributions and bug reports:

• Alberto Wu
• Joran Dirk Greef
• Reio Remma

0.102.0

ClamAV 0.102.0 includes an assortment improvements and a couple of significant changes.

Major changes

• The On-Access Scanning feature has been migrated out of clamd and into a brand new utility named clamonacc. This utility is similar to clamdscan and clamav-milter in that it acts as a client to clamd. This separation from clamd means that clamd no longer needs to run with root privileges while scanning potentially malicious files. Instead, clamd may drop privileges to run under an account that does not have super-user. In addition to improving the security posture of running clamd with On-Access enabled, this update fixed a few outstanding defects:
  • On-Access scanning for created and moved files (Extra-Scanning) is fixed.
  • VirusEvent for On-Access scans is fixed.
  • With clamonacc, it is now possible to copy, move, or remove a file if the scan triggered an alert, just like with clamdscan. For details on how to use the new clamonacc On-Access scanner, please refer to the user manual on ClamAV.net, and keep an eye out for a new blog post on the topic
• The freshclam database update utility has undergone a significant update. This includes:
  • Added support for HTTPS.
  • Support for database mirrors hosted on ports other than 80.
  • Removal of the mirror management feature (mirrors.dat).
  • An all new libfreshclam library API.

Notable changes

• Added support for extracting ESTsoft .egg archives. This feature is new code developed from scratch using ESTsoft's Egg-archive specification and without referencing the UnEgg library provided by ESTsoft. This was necessary because the UnEgg library's license includes restrictions limiting the commercial use of the UnEgg library.

• The documentation has moved!

  • Users should navigate to ClamAV.net to view the documentation online.
  • The documentation will continue to be provided in HTML format with each release for offline viewing in the docs/html directory.
  • The new home for the documentation markdown is in our ClamAV FAQ Github repository

• To remediate future denial of service conditions caused by excessive scan times, we introduced a scan time limit. The default value is 2 minutes (120000 milliseconds).

  To customize the time limit:

  • use the clamscan --max-scantime option
  • use the clamd MaxScanTime config option

  Libclamav users may customize the time limit using the cl_engine_set_num function. For example:

      cl_engine_set_num(engine, CL_ENGINE_MAX_SCANTIME, time_limit_milliseconds)

Other improvements

• Improved Windows executable Authenticode handling, enabling both whitelisting and blacklisting of files based on code-signing certificates. Additional improvements to Windows executable (PE file) parsing. Work courtesy of Andrew Williams.
• Added support for creating bytecode signatures for Mach-O and ELF executable unpacking. Work courtesy of Jonas Zaddach.
• Re-formatted the entire ClamAV code-base using clang-format in conjunction with our new ClamAV code style specification. See the clamav.net blog post for details.
• Integrated ClamAV with Google's OSS-Fuzz automated fuzzing service with the help of Alex Gaynor. This work has already proven beneficial, enabling us to identify and fix subtle bugs in both legacy code and newly developed code.
• The clamsubmit tool is now available on Windows.
• The clamscan metadata feature (--gen-json) is now available on Windows.
• Significantly reduced number of warnings generated when compiling ClamAV with "-Wall" and "-Wextra" compiler flags and made many subtle improvements to the consistency of variable types throughout the code.
• Updated the majority of third-party dependencies for ClamAV on Windows. The source code for each has been removed from the clamav-devel repository. This means that these dependencies have to be compiled independently of ClamAV. The added build process complexity is offset by significantly reducing the difficulty of releasing ClamAV with newer versions of those dependencies.
• During the 0.102 development period, we've also improved our Continuous Integration (CI) processes. Most recently, we added a CI pipeline definition to the ClamAV Git repository. This chains together our build and quality assurance test suites and enables automatic testing of all proposed changes to ClamAV, with customizable parameters to suit the testing needs of any given code change.
• Added a new clamav-version.h generated header to provide version number macros in text and numerical format for ClamAV, libclamav, and libfreshclam.
• Improved cross-platform buildability of libxml2. Work courtesy of Eneas U de Queiroz with supporting ideas pulled from the work of Jim Klimov.

Bug fixes

• Fix to prevent a possible crash when loading LDB type signature databases and PCRE is not available. Patch courtesy of Tomasz Kojm.
• Fixes to the PDF parser that will improve PDF malware detection efficacy. Patch courtesy of Clement Lecigne.
• Fix for regular expression phishing signatures (PDB R-type signatures).
• Various other bug fixes.

New Requirements

• Libcurl has become a hard-dependency. Libcurl enables HTTPS support for freshclam and clamsubmit as well as communication between clamonacc and clamd.

• Libcurl version >= 7.45 is required when building ClamAV from source with the new On-Access Scanning application (clamonacc). Users on Linux operating systems that package older versions of libcurl (e.g. all versions of CentOS and Debian versions <= 8) have a number of options:

  1. Wait for your package maintainer to provide a newer version of libcurl.
  2. Install a newer version of libcurl from source.
  3. Disable installation of clamonacc and On-Access Scanning capabilities with the ./configure flag --disable-clamonacc.

  Non-Linux users will need to take no actions as they are unaffected by this new requirement.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Alex Gaynor
• Andrew Williams
• Carlo Landmeter
• Chips
• Clement Lecigne
• Eneas U de Queiroz
• Jim Klimov
• Joe Cooper
• Jonas Zaddach
• Markus Kolb
• Orion Poplawski
• Ørjan Malde
• Paul Arthur
• Rick Wang
• Romain Chollet
• Rosen Penev
• Thomas Jarosch
• Tomasz Kojm
• Tuomo Soini

Finally, we'd like to thank Joe McGrath for building our quality assurance test suite and for working diligently to ensure knowledge transfer up until his last day on the team. Working with you was a pleasure, Joe, and we wish you the best of luck in your next adventure!

0.101.5

ClamAV 0.101.5 is a security patch release that addresses the following issues.

• Fix for the following vulnerability affecting 0.102.0 and 0.101.4 and prior:

  • CVE-2019-15961 A Denial-of-Service (DoS) vulnerability may occur when scanning a specially crafted email file as a result of excessively long scan times. The issue is resolved by implementing several maximums in parsing MIME messages and by optimizing use of memory allocation.

• Added the zip scanning improvements found in v0.102.0 where it scans files using zip records from a sorted catalogue which provides deduplication of file records resulting in faster extraction and scan time and reducing the likelihood of alerting on non-malicious duplicate file entries as overlapping files.

• Signature load time is significantly reduced by changing to a more efficient algorithm for loading signature patterns and allocating the AC trie. Patch courtesy of Alberto Wu.

• Introduced a new configure option to statically link libjson-c with libclamav. Static linking with libjson is highly recommended to prevent crashes in applications that use libclamav alongside another JSON parsing library.

• Null-dereference fix in email parser when using the --gen-json metadata option.

Special thanks to the following for code contributions and bug reports:

• Alberto Wu
• Joran Dirk Greef

0.101.4

ClamAV 0.101.4 is a security patch release that addresses the following issues.

• An out of bounds write was possible within ClamAV's NSIS bzip2 library when attempting decompression in cases where the number of selectors exceeded the max limit set by the library (CVE-2019-12900). The issue has been resolved by respecting that limit.

  Thanks to Martin Simmons for reporting the issue here

• The zip bomb vulnerability mitigated in 0.101.3 has been assigned the CVE identifier CVE-2019-12625. Unfortunately, a workaround for the zip-bomb mitigation was immediately identified. To remediate the zip-bomb scantime issue, a scan time limit has been introduced in 0.101.4. This limit now resolves ClamAV's vulnerability to CVE-2019-12625.

  The default scan time limit is 2 minutes (120000 milliseconds).

  To customize the time limit:

  • use the clamscan --max-scantime option
  • use the clamd MaxScanTime config option

  Libclamav users may customize the time limit using the cl_engine_set_num function. For example:

      cl_engine_set_num(engine, CL_ENGINE_MAX_SCANTIME, time_limit_milliseconds)

  Thanks to David Fifield for reviewing the zip-bomb mitigation in 0.101.3 and reporting the issue.

0.101.3

ClamAV 0.101.3 is a patch release to address a vulnerability to non-recursive zip bombs.

A Denial-of-Service (DoS) vulnerability may occur when scanning a zip bomb as a result of excessively long scan times. The issue is resolved by detecting the overlapping local file headers which characterize the non-recursive zip bomb described by David Fifield, here.

Thank you to Hanno Böck for reporting the issue as it relates to ClamAV, here.

Also included in 0.101.3:

• Update of bundled the libmspack library from 0.8alpha to 0.10alpha, to address a buffer overflow vulnerability in libmspack < 0.9.1α.

0.101.2

ClamAV 0.101.2 is a patch release to address a handful of security related bugs.

This patch release is being released alongside the 0.100.3 patch so that users who are unable to upgrade to 0.101 due to libclamav API changes are protected.

This release includes 3 extra security related bug fixes that do not apply to prior versions. In addition, it includes a number of minor bug fixes and improvements.

• Fixes for the following vulnerabilities affecting 0.101.1 and prior:

  • CVE-2019-1787: An out-of-bounds heap read condition may occur when scanning PDF documents. The defect is a failure to correctly keep track of the number of bytes remaining in a buffer when indexing file data.
  • CVE-2019-1789: An out-of-bounds heap read condition may occur when scanning PE files (i.e. Windows EXE and DLL files) that have been packed using Aspack as a result of inadequate bound-checking.
  • CVE-2019-1788: An out-of-bounds heap write condition may occur when scanning OLE2 files such as Microsoft Office 97-2003 documents. The invalid write happens when an invalid pointer is mistakenly used to initialize a 32bit integer to zero. This is likely to crash the application.

• Fixes for the following vulnerabilities affecting 0.101.1 and 0.101.0 only:

  • CVE-2019-1786: An out-of-bounds heap read condition may occur when scanning malformed PDF documents as a result of improper bounds-checking.
  • CVE-2019-1785: A path-traversal write condition may occur as a result of improper input validation when scanning RAR archives. Issue reported by aCaB.
  • CVE-2019-1798: A use-after-free condition may occur as a result of improper error handling when scanning nested RAR archives. Issue reported by David L.

• Fixes for the following assorted bugs:

  • Added checks to prevent shifts from causing undefined behavior in HTML normalizer, UPX unpacker, ARJ extractor, CPIO extractor, OLE2 parser, LZW decompressor used in the PDF parser, Xz decompressor, and UTF-16 to ASCII transcoder.
  • Added checks to prevent integer overflow in UPX unpacker.
  • Fix for minor memory leak in OLE2 parser.
  • Fix to speed up PDF parser when handling truncated (or malformed) PDFs.
  • Fix for memory leak in ARJ decoder failure condition.
  • Fix for potential memory and file descriptor leak in HTML normalization code.

• Removed use of problematic feature that converted file descriptors to file paths. The feature was intended to improve performance when scanning file types, notably RAR archives, for which the API requires a file path. This feature caused issues in environments where the ClamAV engine is run in a low-permissions or sandboxed process. RAR archives are still supported with this change, but performance may suffer slightly if the file path is not provided in calls to cl_scandesc_callback().

  • Added filename and tempfile names to scandesc calls in clamd.
  • Added general scan option CL_SCAN_GENERAL_UNPRIVILEGED to treat the scan engine as unprivileged, meaning that the scan engine will not have read access to the file. Provided file paths are for logging purposes only.
  • Added ability to create a temp file when scanning RAR archives when the process does not have read access to the file path provided (i.e. unprivileged is set, or an access check fails).

Thank you to the Google OSS-Fuzz project for identifying and reporting many of the bugs patched in this release.

Additional thanks to the following community members for submitting bug reports:

• aCaB
• David L.

0.101.1

ClamAV 0.101.1 is an urgent patch release to address an issue in 0.101.0 specifically for developers that depend on libclamav.

The issue in 0.101.0 is that clamav.h required supporting headers that were not provided on make install.

To address this issue, the internal cltypes.h header has been replaced by a clamav-types.h that is generated on ./configure and will be installed alongside clamav.h.

Other changes

• Increased the default CommandReadTimeout to reduce the chance of mail loss if using clamav-milter with the TCP socket. Contribution by Scott Kitterman.
• Fixes for --with-libjson and --with-libcurl to correctly accept library install path arguments.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Scott Kitterman

0.101.0

ClamAV 0.101.0 is a feature release with an assortment of improvements that we've cooked up over the past 6 months.

Some of the more obvious changes

• Our user manual has been converted from latex/pdf/html into Markdown! Markdown is easier to read & edit than latex, and is easier to contribute to as it eliminates the need to generate documents (the PDF, HTML). Find the user manual under docs/UserManual[.md]. Check it out!
• Support for RAR v5 archive extraction! We replaced the legacy C-based unrar implementation with RarLabs UnRAR 5.6.5 library. Licensing is the same as before, although our libclamunrar_iface supporting library has changed from LGPL to the BSD 3-Clause license.
• Libclamav API changes:
  • The following scanning functions now require a filename argument. This will enable ClamAV to report more details warning and error information in the future, and will also allow for more sensible temp file names. The filename argument may be NULL if a filename is not available.
    • cl_scandesc
    • cl_scandesc_callback
    • cl_scanmap_callback
  • Scanning options have been converted from a single flag bit-field into a structure of multiple categorized flag bit-fields. This change enabled us to add new scanning options requested by the community. In addition, the name of each scan option has changed a little. As a result, the API changes will require libclamav users to modify how they initialize and pass scan options into calls such as cl_scandesc(). For details:
    • example code
    • documentation
  • With our move to openssl versions >1.0.1, the cl_cleanup_crypto() function has been deprecated. This is because cleanup of open-ssl init functions is now handled by an auto-deinit procedure within the openssl library, meaning the call to EVP_cleanup() may cause problems to processes external to Clam.
  • CL_SCAN_HEURISTIC_ENCRYPTED scan option was replaced by 2 new scan options:
    • CL_SCAN_HEURISTIC_ENCRYPTED_ARCHIVE
    • CL_SCAN_HEURISTIC_ENCRYPTED_DOC
• clamd.conf and command line interface (CLI) changes:

  • As in 0.100.2, the clamd.conf OnAccessExtraScanning has been temporarily disabled in order to prevent resource cleanup issues from impacting clamd stability. As noted below, OnAccessExtraScanning is an opt-in minor feature of on-access scanning on Linux systems and its loss does not significantly impact the effectiveness of on-access scanning. The option still exists, but the feature will not be enabled and a warning will show if LogVerbose is enabled. For details, see: https://bugzilla.clamav.net/show_bug.cgi?id=12048

  • "Heuristic Alerts" (aka "Algorithmic Detection") options have been changed to make the names more consistent. The original options are deprecated in 0.101, and will be removed in a future feature release.

  • In addition, two new scan options were added to alert specifically on encrypted archives or encrypted docs. Previous functionality did both, even though it claimed to be specific to archives:

  • Scan option details:

    Old clamd.conf option	New clamd.conf option
    AlgorithmicDetection	HeuristicAlerts
    DetectBrokenExecutables	AlertBrokenExecutables
    PhishingAlwaysBlockCloak	AlertPhishingCloak
    PhishingAlwaysBlockSSLMismatch	AlertPhishingSSLMismatch
    PartitionIntersection	AlertPartitionIntersection
    BlockMax	AlertExceedsMax
    OLE2BlockMacros	AlertOLE2Macros
    ArchiveBlockEncrypted	AlertEncrypted
    	AlertEncryptedArchive
    	AlertEncryptedDoc

    Old clamscan option	New clamscan option
    --algorithmic-detection	--heuristic-alerts
    --detect-broken	--alert-broken
    --phishing-cloak	--alert-phishing-cloak
    --phishing-ssl	--alert-phishing-ssl
    --partition-intersection	--alert-partition-intersection
    --block-max	--alert-exceeds-max
    --block-macros	--alert-macros
    --block-encrypted	--alert-encrypted
    	--alert-encrypted-archive
    	--alert-encrypted-doc

Some more subtle improvements

• Logical signatures have been extended with a new subsignature type which allows for numerical byte sequence comparison. For those familiar with Snort, this byte comparison feature works similarly to the byte_extract and byte_test feature, in that it allows signature writers to extract and compare a specified number of bytes (offset from a match) against another numeric value. You can read more about this feature, see how it works, and look over examples in our documentation.

• Backwards compatibility improvements for detecting the OpenSSL dependency.

• FreshClam updated to match exit codes defined in the freshclam.1 man page.

• Upgrade from libmspack 0.5alpha to libmspack 0.7.1alpha. As a reminder, we support system-installed versions of libmspack. However, at this time the ClamAV-provided version of libmspack provides additional abilities to parse broken or non-standard CAB files beyond what the stock libmspack 0.7.1alpha provides. We are working with the upstream project to incorporate our modifications, and hopefully these changes will appear in a future release of libmspack.

• Updated the bundled 3rd party library libxml2 included for Windows builds to version 2.9.8.

• Updated the bundled 3rd party library pcre included for Windows builds to pcre2 version 10.31.

• Upgraded Aspack PE unpacking capability with support up to version 2.42.

• Improvements to PDF parsing capability.

• Replaced the Windows installer with a new installer built using InnoSetup 5.

• Improved curl-config detection logic. GitHub pull-request by Thomas Petazzoni.

• Added file type CL_TYPE_LNK to more easily identify Windows Shortcut files when writing signatures.

• Improved parsing of Windows executable (PE) Authenticode signatures. Pull- request by Andrew Williams.

  • Added support for Authenticode signature properties commonly used by Windows system files. These files are now much more likely to be whitelisted correctly.
  • Signature parsing now works correctly on big endian systems.

• Some simplification to freshclam mirror management code, including changes to reduce timeout on ignoring mirrors after errors, and to make freshclam more tolerant when there is a delay between the time the new signature database content is announced and the time that the content-delivery-network has the content available for download.

• Email MIME Header parsing changes to accept argument values with unbalanced quotes. Improvement should improve detection of attachments on malformed emails. GitHub pull-request by monnerat.

• Included the config filename when reporting errors parsing ClamAV configs. GitHub pull-request by Josh Soref.

• Improvement to build scripts for clamav-milter. GitHub pull-request by Renato Botelho.

Other changes

• Removed option handler for AllowSupplementaryGroups from libfreshclam. This option was previously deprecated from freshclam in ClamAV 0.100.0 but remained in libfreshclam by mistake.
• In older versions of pcre2 and in pcre, a higher PCRERecMatchLimit may cause clamd to crash on select files. We have lowered the default PCRERecMatchLimit to 2000 to reduce the likelihood of a crash and have added warnings to recommend using pcre2 v10.30 or higher to eliminate the issue.

Supporting infrastructure

As you might imagine, ClamAV is much more than just the tarball or EXE you download and install. Here at Talos, we've been working hard on the support infrastructure that's so easy to take for granted.

• Test Frameworks

  • Feature Testing: Throughout the development of ClamAV 0.101, our quality assurance engineers have been hard at work rebuilding our QA automation framework in Python from the ground up to test ClamAV features on 32-and-64bit versions:

    • Linux: Ubuntu, Debian, CentOS, Fedora
    • FreeBSD 11
    • Windows 10

    In addition to building out the framework, they've written over 260 individual feature tests to validate correctness of the new features going into 0.101 as well as to validate many existing features.

  • Build Acceptance Testing: Another major task accomplished during the development of 0.101 was the creation of a build acceptance test framework that we run from our Jenkins CI server.

    Similar to the feature testing framework, our build acceptance framework tests accross 64bit and 32bit (where available):

    • macOS 10 (.10, .11, .13)
    • Windows (7, 10)
    • Debian (8, 9), Ubuntu (16.04, 18.04), CentOS (6, 7)
    • FreeBSD (10, 11)

    This pipeline creates our release materials including the Windows installers, and then validates that the basic install, update, start, scan, and stop procedures all work as expected each time commits are made to our development branches.

• Signature Database Distribution: During the course of ClamAV 0.101 development, our web and ops teams have been able to migrate us from a network of third-party mirrors over to use the services of CloudFlare to provide a more unified content-delivery-network.

  With CloudFlare, some users in geographic regions that had few mirrors will notice much improved signature update speeds and reliability. In addition, we're excited to be able to finally see user metrics that will help us continue to improve ClamAV.

  We are of course grateful to all of the community members who have donated their server bandwidth to mirror the ClamAV signature databases over the years. Thank-you so much!

• Development Processes: As many of you know, ClamAV 0.100 was in development for a good two years. Not only was this frustrating for users awaiting new features and bug-fixes, it also made for a difficult transition for users that weren't expecting two years worth of change when 0.100 landed.

  We have learned from the experience and are committed to providing shorter and more responsive ClamAV development cycles.

  ClamAV 0.101 is the first of many smaller feature releases where we created a roadmap with distinct deadlines and with specific planned features. We based the feature list on both community requests and our own needs and then executed that plan.

  We're very proud of ClamAV 0.101 and we hope you enjoy it.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Andrew Williams
• Craig Andrews
• Josh Soref
• monnerat
• Renato Botelho
• tchernomax
• Thomas Petazzoni

0.100.2

ClamAV 0.100.2 is a patch release to address a set of vulnerabilities.

• Fixes for the following ClamAV vulnerabilities:
  • CVE-2018-15378: Vulnerability in ClamAV's MEW unpacking feature that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. Reported by Secunia Research at Flexera.
  • Fix for a 2-byte buffer over-read bug in ClamAV's PDF parsing code. Reported by Alex Gaynor.
• Fixes for the following vulnerabilities in bundled third-party libraries:
  • CVE-2018-14680: An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. It does not reject blank CHM filenames.
  • CVE-2018-14681: An issue was discovered in kwajd_read_headers in mspack/kwajd.c in libmspack before 0.7alpha. Bad KWAJ file header extensions could cause a one or two byte overwrite.
  • CVE-2018-14682: An issue was discovered in mspack/chmd.c in libmspack before 0.7alpha. There is an off-by-one error in the TOLOWER() macro for CHM decompression.
  • Additionally, 0.100.2 reverted 0.100.1's patch for CVE-2018-14679, and applied libmspack's version of the fix in its place.
• Other changes:
  • Some users have reported freshclam signature update failures as a result of a delay between the time the new signature database content is announced and the time that the content-delivery-network has the content available for download. To mitigate these errors, this patch release includes some modifications to freshclam to make it more lenient, and to reduce the time that freshclam will ignore a mirror when it detects an issue.
  • On-Access "Extra Scanning", an opt-in minor feature of OnAccess scanning on Linux systems, has been disabled due to a known issue with resource cleanup. OnAccessExtraScanning will be re-enabled in a future release when the issue is resolved. In the mean-time, users who enabled the feature in clamd.conf will see a warning informing them that the feature is not active. For details, see: https://bugzilla.clamav.net/show_bug.cgi?id=12048

Thank you to the following ClamAV community members for your code submissions and bug reports!

• Alex Gaynor
• Hiroya Ito
• Laurent Delosieres, Secunia Research at Flexera

0.100.1

ClamAV 0.100.1 is a hotfix release to patch a set of vulnerabilities.

• Fixes for the following CVE's:
  • CVE-2017-16932: Vulnerability in libxml2 dependency (affects ClamAV on Windows only).
  • CVE-2018-0360: HWP integer overflow, infinite loop vulnerability. Reported by Secunia Research at Flexera.
  • CVE-2018-0361: ClamAV PDF object length check, unreasonably long time to parse relatively small file. Reported by aCaB.
• Fixes for a few additional bugs:
  • Buffer over-read in unRAR code due to missing max value checks in table initialization. Reported by Rui Reis.
  • Libmspack heap buffer over-read in CHM parser. Reported by Hanno Böck.
  • PDF parser bugs reported by Alex Gaynor.
    • Buffer length checks when reading integers from non-NULL terminated strings.
    • Buffer length tracking when reading strings from dictionary objects.
• HTTPS support for clamsubmit.
• Fix for DNS resolution for users on IPv4-only machines where IPv6 is not available or is link-local only. Patch provided by Guilherme Benkenstein.

Thank you to the following ClamAV community members for your code submissions and bug reports!

• aCaB
• Alex Gaynor
• Guilherme Benkenstein
• Hanno Böck
• Rui Reis
• Laurent Delosieres, Secunia Research at Flexera

0.100.0

ClamAV 0.100.0 is a feature release which includes many code submissions from the ClamAV community. As always, it can be downloaded from our downloads page on clamav.net. Some of the more prominent submissions include:

• Interfaces to the Prelude SIEM open source package for collecting ClamAV virus events.
• Support for Visual Studio 2015 for Windows builds. Please note that we have deprecated support for Windows XP, and while Vista may still work, we no longer test ClamAV on Windows XP or Vista.
• Support libmspack internal code or as a shared object library. The internal library is the default and includes modifications to enable parsing of CAB files that do not entirely adhere to the CAB file format.
• Linking with OpenSSL 1.1.0.
• Deprecation of the AllowSupplementaryGroups parameter statement in clamd, clamav-milter, and freshclam. Use of supplementary is now in effect by default.
• Numerous bug fixes, typo corrections, and compiler warning fixes.

Additionally, we have introduced important changes and new features in ClamAV 0.100, including but not limited to:

• Deprecating internal LLVM code support. The configure script has changed to search the system for an installed instance of the LLVM development libraries, and to otherwise use the bytecode interpreter for ClamAV bytecode signatures. To use the LLVM Just-In-Time compiler for executing bytecode signatures, please ensure that the LLVM development package at version 3.6 or lower is installed. Using the deprecated LLVM code is possible with the command: ./configure --with-system-llvm=no, but it no longer compiles on all platforms.
• Compute and check PE import table hash (a.k.a. "imphash") signatures.
• Support file property collection and analysis for MHTML files.
• Raw scanning of PostScript files.
• Fix clamsubmit to use the new virus and false positive submission web interface.
• Optionally, flag files with the virus "Heuristics.Limits.Exceeded" when size limitations are exceeded.
• Improved decoders for PDF files.
• Reduced number of compile time warnings.
• Improved support for C++11.
• Improved detection of system installed libraries.
• Fixes to ClamAV's Container system and the introduction of Intermediates for more descriptive signatures.
• Improvements to clamd's On-Access scanning capabilities for Linux.

Acknowledgements

The ClamAV team thanks the following individuals for their code submissions:

• Andreas Schulze
• Anthony Chan
• Bill Parker
• Chris Miserva
• Daniel J. Luke
• Georgy Salnikov
• James Ralston
• Jonas Zaddach
• Keith Jones
• Marc Deslauriers
• Mark Allan
• Matthew Boedicker
• Michael Pelletier
• Ningirsu
• Sebastian Andrzej Siewior
• Stephen Welker
• Tuomo Soini

Known Issues

ClamAV has an active issue queue and enjoys continual improvement but as sad as I am to say it, we couldn't address every bug in this release. I want to draw your attention a couple bugs in particular so as not to frustrate users setting up ClamAV:

• Platform: macOS:

  • Bug: If you attempt to build ClamAV with a system installed LLVM you may receive a linker error. We recently changed default linking behavior to prefer dynamic linking over static linking. As a result, we've uncovered a bug in building on macOS where dynamic linking against the LLVM libraries fails. To work around this bug, please add the --with-llvm-linking=static option to your ./configure call.

• Platform: CentOS 6 32bit, older versions of AIX:

  • Bug: On CentOS 6 32bit we observed that specific versions of zlib fail to correctly decompress the CVD signature databases. If you are on an older system such as CentoOS 6 32bit and observe failures loading the signature database, please consider upgrading to a newer version of zlib.

• Platform: Miscellaneous

  • Bug: When cross compiling on certain legacy systems (Solaris, AIX, OSX) against older system libraries that do not support strn functions linking may fail during compile time. While automatic checking is done during configure time to check for unsupported libs, this problem can be manually avoided using the --enable-strni configure flag if it is encountered.

0.99.4

ClamAV 0.99.4 is a hotfix release to patch a set of vulnerabilities.

• fixes for the following CVE's: CVE-2012-6706, CVE-2017-6419, CVE-2017-11423, CVE-2018-0202, and CVE-2018-1000085.
• also included are 2 fixes for file descriptor leaks as well fixes for a handful of other important bugs, including patches to support g++ 6, C++11.

Thank you to the following ClamAV community members for your code submissions and bug reports!

Alberto Garcia Bernhard Vogel Francisco Oca Hanno Böck Jeffrey Yasskin Keith Jones mtowalski Suleman Ali yongji.oy xrym

0.99.3

ClamAV 0.99.3 is a hotfix release to patch a set of vulnerabilities.

• fixes for the following CVE's: CVE-2017-6418, CVE-2017-6420, CVE-2017-12374, CVE-2017-12375, CVE-2017-12376, CVE-2017-12377, CVE-2017-12378, CVE-2017-12379, CVE-2017-12380.
• also included are 2 minor fixes to properly detect openssl install locations on FreeBSD 11, and prevent false warnings about zlib 1.2.1# version numbers.

Thank you to the following ClamAV community members for your code submissions and bug reports!

• Alberto Garcia
• Daniel J. Luke
• Francisco Oca
• Sebastian A. Siewior
• Suleman Ali

Special thanks to Offensive Research at Salesforce.com for responsible disclosure.

0.99.2

ClamAV 0.99.2 is a release of bug fixes and minor enhancements.

• fix ups improving the reliability of several ClamAV file parsers.
• sigtool now decodes file type signatures (e.g., daily.ftm CVD file).
• now supporting libpcre2 in addition to libpcre.
• systemd support for clamd and freshclam. Patch provided by Andreas Cadhalpun.
• fixed builds on Mac OS X 10.10 & 10.11.
• improved debug info for certificate metadata.
• improved freshclam messaging when using a proxy.
• fixed some freshclam functionality when using private mirrors.
• clamd refinements of open file limitations on Solaris. Patch by Jim Morris
• clamav-milter signal handling for improved clean up during termination.

Thank you to the following ClamAV community members for your code submissions and bug reports!

• Brandon Perry
• Sebastian Andrzej Siewior
• Andreas Cadhalpun
• Jim Morris
• Kai Risku
• Bill Parker
• Tomasz Kojm
• Steve Basford
• Daniel J. Luke
• James Ralston
• John Dodson

0.99.1

ClamAV 0.99.1 contains a new feature for parsing Hancom Office files including extracting and scanning embedded objects. ClamAV 0.99.1 also contains important bug fixes. Please see ChangeLog for details.

Thanks to the following community members for code submissions used in ClamAV 0.99.1:

• Jim Morris
• Andreas Cadhalpun
• Mark Allan
• Sebastian Siewior

0.99

ClamAV 0.99 contains major new features and changes. YARA rules, Perl Compatible Regular Expressions, revamped on-access scanning for Linux, and other new features join the many great features of ClamAV:

• Processing of YARA rules(some limitations- see signatures.pdf).
• Support in ClamAV logical signatures for many of the features added for YARA, such as Perl Compatible Regular Expressions, alternate strings, and YARA string attributes. See signatures.pdf for full details.
• New and improved on-access scanning for Linux. See the recent blog post and clamdoc.pdf for details on the new on-access capabilities.
• A new ClamAV API callback function that is invoked when a virus is found. This is intended primarily for applications running in all-match mode. Any applications using all-match mode must use the new callback function to record and report detected viruses.
• Configurable default password list to attempt zip file decryption.
• TIFF file support.
• Upgrade Windows pthread library to 2.9.1.
• A new signature target type for designating signatures to run against files with unknown file types.
• Improved fidelity of the "data loss prevention" heuristic algorithm. Code supplied by Bill Parker.
• Support for LZMA decompression within Adobe Flash files.
• Support for MSO attachments within Microsoft Office 2003 XML files.
• A new sigtool option(--ascii-normalize) allowing signature authors to more easily generate normalized versions of ascii files.
• Windows installation directories changed from \Program Files\Sourcefire
  ClamAV to \Program Files\ClamAV or \Program Files\ClamAV-x64.

PLEASE NOTE: If you are using clamd on-access scanning or have applications using all-match mode, you will want to review the changes and make any necessary adjustments before using ClamAV 0.99. Users of windows binaries need to be aware of the change of installation directories.

Thank you to the ClamAV community members who sent patches and bug reports included for ClamAV 0.99:

• Steve Basford
• Sebastian Andrzej Siewior
• Bill Parker
• Andreas Schulze
• Yann E. Morin
• Andreas Cadhalpun
• Dmitry Marakasov
• Michael Pelletier
• Felix Groebert
• Stephen Welker

0.98.7

ClamAV 0.98.7 is here! This release contains new scanning features and bug fixes.

• Improvements to PDF processing: decryption, escape sequence handling, and file property collection.
• Scanning/analysis of additional Microsoft Office 2003 XML format.
• Fix infinite loop condition on crafted y0da cryptor file. Identified and patch suggested by Sebastian Andrzej Siewior. CVE-2015-2221.
• Fix crash on crafted petite packed file. Reported and patch supplied by Sebastian Andrzej Siewior. CVE-2015-2222.
• Fix false negatives on files within iso9660 containers. This issue was reported by Minzhuan Gong.
• Fix a couple crashes on crafted upack packed file. Identified and patches supplied by Sebastian Andrzej Siewior.
• Fix a crash during algorithmic detection on crafted PE file. Identified and patch supplied by Sebastian Andrzej Siewior.
• Fix an infinite loop condition on a crafted "xz" archive file. This was reported by Dimitri Kirchner and Goulven Guiheux. CVE-2015-2668.
• Fix compilation error after ./configure --disable-pthreads. Reported and fix suggested by John E. Krokes.
• Apply upstream patch for possible heap overflow in Henry Spencer's regex library. CVE-2015-2305.
• Fix crash in upx decoder with crafted file. Discovered and patch supplied by Sebastian Andrzej Siewior. CVE-2015-2170.
• Fix segfault scanning certain HTML files. Reported with sample by Kai Risku.
• Improve detections within xar/pkg files.

As always, we appreciate contributions of bug reports, code fixes, and sample submission from the ClamAV community members:

Sebastian Andrzej Siewior Minzhuan Gong Dimitri Kirchner Goulven Guiheux John E. Krokes Kai Risku

0.98.6

ClamAV 0.98.6 is a bug fix release correcting the following:

• library shared object revisions.
• installation issues on some Mac OS X and FreeBSD platforms.
• includes a patch from Sebastian Andrzej Siewior making ClamAV pid files compatible with systemd.
• Fix a heap out of bounds condition with crafted Yoda's crypter files. This issue was discovered by Felix Groebert of the Google Security Team.
• Fix a heap out of bounds condition with crafted mew packer files. This issue was discovered by Felix Groebert of the Google Security Team.
• Fix a heap out of bounds condition with crafted upx packer files. This issue was discovered by Kevin Szkudlapski of Quarkslab.
• Fix a heap out of bounds condition with crafted upack packer files. This issue was discovered by Sebastian Andrzej Siewior. CVE-2014-9328.
• Compensate a crash due to incorrect compiler optimization when handling crafted petite packer files. This issue was discovered by Sebastian Andrzej Siewior.

Thanks to the following ClamAV community members for code submissions and bug reporting included in ClamAV 0.98.6:

Sebastian Andrzej Siewior Felix Groebert Kevin Szkudlapski Mark Pizzolato Daniel J. Luke

0.98.5

Welcome to ClamAV 0.98.5! ClamAV 0.98.5 includes important new features for collecting and analyzing file properties. Software developers and analysts may collect file property meta data using the ClamAV API for subsequent analysis by ClamAV bytecode programs. Using these features will require that libjson-c is installed, but otherwise libjson-c is not needed.

Look for our upcoming series of blog posts to learn more about using the ClamAV API and bytecode facilities for collecting and analyzing file properties.

ClamAV 0.98.5 also includes these new features and bug fixes:

• Support for the XDP file format and extracting, decoding, and scanning PDF files within XDP files.
• Addition of shared library support for LLVM versions 3.1 - 3.5 for the purpose of just-in-time(JIT) compilation of ClamAV bytecode signatures. Andreas Cadhalpun submitted the patch implementing this support.
• Enhancements to the clambc command line utility to assist ClamAV bytecode signature authors by providing introspection into compiled bytecode programs.
• Resolution of many of the warning messages from ClamAV compilation.
• Improved detection of malicious PE files.
• Security fix for ClamAV crash when using 'clamscan -a'. This issue was identified by Kurt Siefried of Red Hat.
• Security fix for ClamAV crash when scanning maliciously crafted yoda's crypter files. This issue, as well as several other bugs fixed in this release, were identified by Damien Millescamp of Oppida.
• ClamAV 0.98.5 now works with OpenSSL in FIPS compliant mode. Thanks to Reinhard Max for supplying the patch.
• Bug fixes and other feature enhancements. See Changelog or git log for details.

Thanks to the following ClamAV community members for code submissions and bug reporting included in ClamAV 0.98.5:

Andreas Cadhalpun Sebastian Andrzej Siewior Damien Millescamp Reinhard Max Kurt Seifried

0.98.4

ClamAV 0.98.4 is a bug fix release. The following issues are now resolved:

• Various build problems on Solaris, OpenBSD, AIX.
• Crashes of clamd on Windows and Mac OS X platforms when reloading the virus signature database.
• Infinite loop in clamdscan when clamd is not running.
• FreshClam failure on Solaris 10.
• Buffer underruns when handling multi-part MIME email attachments.
• Configuration of OpenSSL on various platforms.
• Name collisions on Ubuntu 14.04, Debian sid, and Slackware 14.1.

Thanks to the following individuals for testing, writing patches, and initiating quality improvements in this release:

Tuomo Soini Scott Kitterman Jim Klimov Curtis Smith Steve Basford Martin Preen Lars Hecking Stuart Henderson Ismail Paruk Larry Rosenbaum Dave Simonson Sebastian Andrzej Siewior

0.98.2

Here are the new features and improvements in ClamAV 0.98.2:

• Support for common raw disk image formats using 512 byte sectors, specifically GPT, APM, and MBR partitioning.
• Experimental support of OpenIOC files. ClamAV will now extract file hashes from OpenIOC files residing in the signature database location, and generate ClamAV hash signatures. ClamAV uses no other OpenIOC features at this time. No OpenIOC files will be delivered through freshclam. See openioc.org and iocbucket.com for additional information about OpenIOC.
• All ClamAV sockets (clamd, freshclam, clamav-milter, clamdscan, clamdtop) now support IPV6 addresses and configuration parameters.
• Use OpenSSL file hash functions for improved performance. OpenSSL is now prerequisite software for ClamAV 0.98.2.
• Improved detection of malware scripts within image files. Issue reported by Maarten Broekman.
• Change to circumvent possible denial of service when processing icons within specially crafted PE files. Icon limits are now in place with corresponding clamd and clamscan configuration parameters. This issue was reported by Joxean Koret.
• Improvements to the fidelity of the ClamAV pattern matcher, an issue reported by Christian Blichmann.
• Opt-in collection of statistics. Statistics collected are: sizes and MD5 hashes of files, PE file section counts and section MD5 hashes, and names and counts of detected viruses. Enable statistics collection with the --enable-stats clamscan flag or StatsEnabled clamd configuration parameter.
• Improvements to ClamAV build process, unit tests, and platform support with assistance and suggestions by Sebastian Andrzej Siewior, Scott Kitterman, and Dave Simonson.
• Patch by Arkadiusz Miskiewicz to improve error handling in freshclam.
• ClamAV 0.98.2 also includes miscellaneous bug fixes and documentation improvements.

Thanks to the following ClamAV community members for sending patches or reporting bugs and issues that are addressed in ClamAV 0.98.2:

Sebastian Andrzej Siewior Scott Kitterman Joxean Koret Arkadiusz Miskiewicz Dave Simonson Maarten Broekman Christian Blichmann

--

REGARDING OPENSSL

In addition, as a special exception, the copyright holders give permission to link the code of portions of this program with the OpenSSL library under certain conditions as described in each individual source file, and distribute linked combinations including the two.

You must obey the GNU General Public License in all respects for all of the code used other than OpenSSL. If you modify file(s) with this exception, you may extend this exception to your version of the file(s), but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. If you delete this exception statement from all source files in the program, then also delete it here.

0.98.1

ClamAV 0.98.1 provides improved support of Mac OS X platform, support for new file types, and quality improvements. These include:

• Extraction, decompression, and scanning of files within Apple Disk Image (DMG) format.

• Extraction, decompression, and scanning of files within Extensible Archive (XAR) format. XAR format is commonly used for software packaging, such as PKG and RPM, as well as general archival.

• Decompression and scanning of files in "Xz" compression format.

• Recognition of Open Office XML formats.

• Improvements and fixes to extraction and scanning of ole formats.

• Option to force all scanned data to disk. This impacts only a few file types where some embedded content is normally scanned in memory. Enabling this option ensures that a file descriptor exists when callback functions are used, at a small performance cost. This should only be needed when callback functions are used that need file access.

• Various improvements to ClamAV configuration, support of third party libraries, and unit tests.

0.98

ClamAV 0.98 includes many new features, across all the different components of ClamAV. There are new scanning options, extensions to the libclamav API, support for additional filetypes, and internal upgrades.

• Signature improvements: New signature targets have been added for PDF files, Flash files and Java class files. (NOTE: Java archive files (JAR) are not part of the Java target.) Hash signatures can now specify a '*' (wildcard) size if the size is unknown. Using wildcard size requires setting the minimum engine FLEVEL to avoid backwards compatibility issues. For more details read the ClamAV Signatures guide.

• Scanning enhancements: New filetypes can be unpacked and scanned, including ISO9660, Flash, and self-extracting 7z files. PDF handling is now more robust and better handles encrypted PDF files.

• Authenticode: ClamAV is now aware of the certificate chains when scanning signed PE files. When the database contains signatures for trusted root certificate authorities, the engine can whitelist PE files with a valid signature. The same database file can also include known compromised certificates to be rejected! This feature can also be disabled in clamd.conf (DisableCertCheck) or the command-line (nocerts).

• New options: Several new options for clamscan and clamd have been added. For example, ClamAV can be set to print infected files and error files, and suppress printing OK results. This can be helpful when scanning large numbers of files. This new option is "-o" for clamscan and "LogClean" for clamd. Check clamd.conf or the clamscan help message for specific details.

• New callbacks added to the API: The libclamav API has additional hooks for developers to use when wrapping ClamAV scanning. These function types are prefixed with "clcb_" and allow developers to add logic at certain steps of the scanning process without directly modifying the library. For more details refer to the clamav.h file.

• More configurable limits: Several hardcoded values are now configurable parameters, providing more options for tuning the engine to match your needs. Check clamd.conf or the clamscan help message for specific details.

• Performance improvements: This release furthers the use of memory maps during scanning and unpacking, continuing the conversion started in prior releases. Complex math functions have been switched from libtommath to tomsfastmath functions. The A/C matcher code has also been optimized to provide a speed boost.

• Support for on-access scanning using Clamuko/Dazuko has been replaced with fanotify. Accordingly, clamd.conf settings related to on-access scanning have had Clamuko removed from the name. Clamuko-specific configuration items have been marked deprecated and should no longer be used.

There are also fixes for other minor issues and code quality changes. Please see the ChangeLog file for details.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.97.8

ClamAV 0.97.8 addresses several reported potential security bugs. Thanks to Felix Groebert of the Google Security Team for finding and reporting these issues.

0.97.7

ClamAV 0.97.7 addresses several reported potential security bugs. Thanks to Felix Groebert, Mateusz Jurczyk and Gynvael Coldwind of the Google Security Team for finding and reporting these issues.

0.97.6

ClamAV 0.97.6 includes minor bug fixes and detection improvements. ClamAV 0.97.6 corrects bug 5252 "CL_EFORMAT: Bad format or broken data ERROR reported as scan result."

0.97.5

ClamAV 0.97.5 addresses possible evasion cases in some archive formats (CVE-2012-1457, CVE-2012-1458, CVE-2012-1459). It also addresses stability issues in portions of the bytecode engine. This release is recommended for all users.

0.97.4

ClamAV 0.97.4 includes minor bugfixes, detection improvements and initial support for on-access scanning under Mac OS X (see contrib/ClamAuth). This update is recommended for all users.

0.97.3

ClamAV 0.97.3 is a minor bugfix release and is recommended for all users. Please refer to the ChangeLog file for details.

0.97.2

ClamAV 0.97.2 fixes problems with the bytecode engine, Safebrowsing detection, hash matcher, and other minor issues. Please see the ChangeLog file for details.

0.97.1

This is a bugfix release recommended for all users. Please refer to the ChangeLog file for details.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.97

ClamAV 0.97 brings many improvements, including complete Windows support (all major components compile out-of-box under Visual Studio), support for signatures based on SHA1 and SHA256, better error detection, as well as speed and memory optimizations. The complete list of changes is available in the ChangeLog file. For upgrade notes and tips please see: https://wiki.clamav.net/Main/UpgradeNotes097

With Sourcefire, Inc. acquisition of Immunet Corp., ClamAV for Windows 3.0 has been renamed Immunet 3.0, powered by ClamAV. This release contains the fully integrated LibClamAV 0.97 engine for offline, OnDemand, and OnAccess scanning. Immunet 3.0 users can now utilize the full power of the LibClamAV engine, all the ClamAV signatures, and creation of custom signatures on any platform running Immunet 3.0, powered by ClamAV. If you run Windows systems in your environment and need an AV solution to protect them, give Immunet 3.0, powered by ClamAV a try; you can download it from https://www.clamav.net/download.html#otherversions

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.96.5

ClamAV 0.96.5 includes bugfixes and minor feature enhancements, such as improved handling of detection statistics, better file logging, and support for custom database URLs in freshclam. Please refer to the ChangeLog for details.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.96.4

ClamAV 0.96.4 is a bugfix release recommended for all users.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.96.3

This release fixes problems with the PDF parser and the internal bzip2 library. A complete list of changes is available in the Changelog file.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.96.2

ClamAV 0.96.2 brings a new PDF parser, performance and memory improvements, and a number of bugfixes and minor enhancements. This upgrade is recommended for all users.

0.96.1

This is a bugfix release, please refer to the ChangeLog for the complete list of changes.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.96

This release of ClamAV introduces new malware detection mechanisms and other significant improvements to the scan engine. The key features include:

• The Bytecode Interpreter: the interpreter built into LibClamAV allows the signature writers to create and distribute very complex detection routines and remotely enhance the scanner's functionality

• Heuristic improvements: improve the PE heuristics detection engine by adding support of bogus icons and fake PE header information. In a nutshell, ClamAV can now detect malware that tries to disguise itself as a harmless application by using the most common Windows program icons.

• Signature Improvements: logical signature improvements to allow more detailed matching and referencing groups of signatures. Additionally, improvements to wildcard matching on word boundaries and newlines.

• Support for new archives: 7zip, InstallShield and CPIO. LibClamAV can now transparently unpack and inspect their contents.

• Support for new executable file formats: 64-bit ELF files and OS X Universal Binaries with Mach-O files. Additionally, the PE module can now decompress and inspect executables packed with UPX 3.0.

• Support for DazukoFS in clamd

• Performance improvements: overall performance improvements and memory optimizations for a better overall resource utilization experience.

• Native Windows Support: ClamAV will now build natively under Visual Studio. This will allow 3rd Party application developers on Windows to easily integrate LibClamAV into their applications.

The complete list of changes is available in the ChangeLog file. For upgrade notes and tips please see: https://wiki.clamav.net/Main/UpgradeNotes096

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.95.3

ClamAV 0.95.3 is a bugfix release recommended for all users. Please refer to the ChangeLog included in the source distribution for the list of changes.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.95.2

This version improves handling of archives, adds support for --file-list in clamscan and clamdscan, and fixes various issues found in previous releases.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.95.1

This is a bugfix release only, please see the ChangeLog for details.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.95

ClamAV 0.95 introduces many bugfixes, improvements and additions. To make the transition easier, we put various tips and upgrade notes on this page: https://wiki.clamav.net/Main/UpgradeNotes095. For detailed list of changes and bugfixes, please see the ChangeLog.

The following are the key features of this release:

• Google Safe Browsing support: in addition to the heuristic and signature based phishing detection mechanisms already available in ClamAV, the scanner can now make use of the Google's blacklists of suspected phishing and malware sites. The ClamAV Project distributes a constantly updated Safe Browsing database, which can be automatically fetched by freshclam. For more information, please see freshclam.conf(5) and https://docs.clamav.net/faq/faq-safebrowsing.html.

• New clamav-milter: The program has been redesigned and rewritten from scratch. The most notable difference is that the internal mode has been dropped which means that now a working clamd companion is required. The milter now also has its own configuration file.

• Clamd extensions: The protocol has been extended to lighten the load that clamd puts on the system, solve limitations of the old protocol, and reduce latency when signature updates are received. For more information about the new extensions please see the official documentation and the upgrade notes.

• Improved API: The API used to program ClamAV's engine (libclamav) has been redesigned to use modern object-oriented techniques and solves various API/ABI compatibility issues between old and new releases. You can find more information in Section 6 of clamdoc.pdf and in the upgrade notes.

• ClamdTOP: This is a new program that allows system administrators to monitor clamd. It provides information about the items in the clamd's queue, clamd's memory usage, and the version of the signature database, all in real-time and in nice curses-based interface.

• Memory Pool Allocator: Libclamav now includes its own memory pool allocator based on memory mapping. This new solution replaces the traditional malloc/free system for the copy of the signatures that is kept in memory. As a result, clamd requires much less memory, particularly when signature updates are received and the database is loaded into memory.

• Unified Option Parser: Prior to version 0.95 each program in ClamAV's suite of programs had its own set of runtime options. The new general parser brings consistency of use and validation to these options across the suite. Some command line switches of clamscan have been renamed (the old ones will still be accepted but will have no effect and will result in warnings), please see clamscan(1) and clamscan --help for the details.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.94.2

This is a bugfix release, please refer to the ChangeLog for a complete list of changes.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.94.1

ClamAV 0.94.1 fixes some issues that were found in previous releases and includes one new feature, "Malware Statistics Gathering." This is an optional feature that allows ClamAV users optionally to submit statistics to us about what they detect in the field. We will then use these data to determine what types of malware are the most detected in the field and in what geographic area they are. It will also allow us to publish summary data on www.clamav.net where our users will be able to monitor the latest threats. You can help us by enabling SubmitDetectionStats in freshclam.conf.

For more details, please refer to the ChangeLog

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.94

Sourcefire and the ClamAV team are pleased to announce the release of ClamAV 0.94. The following are the key features and improvements of this version:

• Logical Signatures: The logical signature technology uses operators such as AND, OR and NOT to allow the combination of more than one signature into one entry in the signature database resulting in more detailed and flexible pattern matching.

• Anti-phishing Technology: Users can now change the priority and reporting of ClamAV's heuristic anti-phishing scanner within the detection engine process. They can choose whether, when scanning a suspicious file, ClamAV should stop scanning and report the phish, or continue to scan in case the file contains other malware (clamd: HeuristicScanPrecedence, clamscan: --heuristic-scan-precedence)

• Disassembly Engine: The initial version of the disassembly engine improves ClamAV's detection abilities.

• PUA Detection: Users can now decide which PUA signatures should be loaded (clamd: ExcludePUA, IncludePUA; clamscan: --exclude-pua, --include-pua)

• Data Loss Prevention (DLP): This version includes a new module that, when enabled, scans data for the inclusion of US formated Social Security Numbers and credit card numbers (clamd: StructuredDataDetection, clamscan: --detect-structured; additional fine-tuning options are available)

• IPv6 Support: FreshClam now supports IPv6

• Improved Scanning of Scripts: The normalization of scripts now covers JavaScript

• Improved QA and Unit Testing: The improved QA process now includes API testing and new library of test files in various formats that are tested on a wide variety of systems (try running 'make check' in the source directory)

You may need to run 'ldconfig' after installing this version.

** This version drops the special support for Cygwin. Our QA process showed ** serious problems with ClamAV builds under Cygwin due to some low-level ** incompatibilities in the POSIX compatibility layer, resulting in unreliable ** ClamAV behaviour.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.93.3

This release fixes a problem in handling of .cld files introduced in 0.93.2.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.93.2

This release fixes and re-enables the Petite unpacker, improves database loading and solves some other minor issues.

0.93.1

This version improves handling of PDF, CAB, RTF, OLE2 and HTML files and includes various bugfixes for 0.93 issues.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.93

This release introduces many new features and engine enhancements, please see the notes below for the list of major changes. The most visible one is the new logic in scan limits which affects some command line and config options of clamscan and clamd. Please see clamscan(1) and clamd.conf(5) and the example config file for more information on the new options.

Most important changes include:

• libclamav:

  • New logic in scan limits: provides much more efficient protection against DoS attacks but also results in different command line and config options to clamscan and clamd (see below)
  • New/improved modules: unzip, SIS, cabinet, CHM, SZDD, text normalisator, entity converter
  • Improved filetype detection; filetype definitions can be remotely updated
  • Support for .cld containers (which replace .inc directories)
  • Improved pattern matcher and signature formats
  • More efficient scanning of HTML files
  • Many other improvements

• clamd:

  • NEW CONFIG FILE OPTIONS: MaxScanSize, MaxFileSize, MaxRecursion, MaxFiles
  • ** THE FOLLOWING OPTIONS ARE NO LONGER SUPPORTED **: MailMaxRecursion, ArchiveMaxFileSize, ArchiveMaxRecursion, ArchiveMaxFiles, ArchiveMaxCompressionRatio, ArchiveBlockMax

• clamscan:

  • NEW CMDLINE OPTIONS: --max-filesize, --max-scansize
  • REMOVED OPTIONS: --block-max, --max-space, --max-ratio

• freshclam:

  • NEW CONFIG OPTION CompressLocalDatabase
  • NEW CMDLINE SWITCH --no-warnings
  • main.inc and daily.inc directories are no longer used by ClamAV; please remove them manually from your database directory

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.92.1

This is a bugfix release, please refer to the ChangeLog for a complete list of changes.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.92

This release provides various bugfixes, optimizations and improvements to the scanning engine. The new features include support for ARJ and SFX-ARJ archives, AutoIt, basic SPF parser in clamav-milter (to reduce phishing false-positives), faster scanning and others (see ChangeLog). To get a consistent behaviour of the anti-phishing module on all platforms, libclamav now includes the regex library from OpenBSD.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.91.2

This release fixes various bugs in libclamav, freshclam and clamav-milter, and adds support for PUA (Potentially Unwanted Application) signatures (clamscan: --detect-pua, clamd: DetectPUA).

** Announcement **

Dear ClamAV users,

On August 17, Sourcefire, the creators of Snort, acquired the ClamAV project. The full announcement is available here:

http://www.sourcefire.com/products/clamav/

We'd like to thank everyone in the ClamAV community for their dedication to the project. The acquisition by Sourcefire is a testament to the hard work of the entire ClamAV community in developing cutting edge technology that truly showcases the promise of the open source model. With the additional resources Sourcefire will provide we look forward to working with the community to continue the advancement of ClamAV.

Sourcefire now owns ClamAV project and related trademarks, as well as the source code copyrights held by the five principal members of the ClamAV team. Sourcefire will also assume control of the ClamAV project including: the ClamAV.org domain, web site and web site content; and the ClamAV Sourceforge project page.

What's most important is that from the end-user perspective very little will change beyond the additional resources Sourcefire will provide in our continued efforts to advance the ClamAV technology and improve our ability to interact with the open source community. The core team will continue to lead the advancement of ClamAV and the CVD as employees of Sourcefire. Both the ClamAV engine and the signature database will remain under GPL.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.91.1

This release fixes stability and other issues of 0.91.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.91

ClamAV 0.91 is the first release to enable the anti-phishing technology in default builds. This technology combines heuristics with special signatures and provides effective protection against phishing threats. Other important changes and add-ons in this version include:

• unpacker for NSIS (Nullsoft Scriptable Install System) self-extracting archives
• unpacker for ASPack 2.12
• new implementation of the Aho-Corasick pattern matcher providing better detection for wildcard enabled signatures
• support for nibble matching and floating offsets
• improved handling of .mdb files (fixes long startup times)
• extraction of PE files embedded into other executables
• better handling of PE & UPX
• removed dependency on libcurl (improves stability)
• libclamav.dll available under Windows
• IPv6 support in clamav-milter
• many other improvements and bugfixes

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.90.3

This release fixes some security bugs in libclamav and improves stability under Solaris. Please see ChangeLog for complete list of changes.

If your system is suffering from long clamscan startup times, please consider installing 0.91rc1 which is due to be released shortly after 0.90.3.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.90.2

This release fixes many problems in libclamav and freshclam.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.90.1

This release includes various bugfixes and code enhancements. Please see ChangeLog for complete list of changes.

** Important note **: please run 'ldconfig' after installing this version.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.90

The ClamAV team is proud to announce the long awaited ClamAV 0.90. This version introduces lots of new interesting features and marks a big step forward in the development of our antivirus engine.

The most important change is the introduction of scripted updates. Instead of transferring the whole cvd file at each update, only the differences between the latest cvds and the previous versions will be transferred.

In case the local copy of the latest cvd is corrupted or the scripted update fails for some reason, freshclam will fallback to the old method. Similarly to cvd files, scripted updates are compressed and digitally signed and are already being distributed. They will dramatically reduce traffic on our mirrors and will allow us to release even more updates in the future.

Another noticeable change is the new configuration syntax: you can now turn single options on and off, the old crude hack of "DisableDefaultScanOptions" is no longer required.

Cosmetic changes apart, the 0.9x series introduces lots of new code, but some parts are not compiled in by default because they are not ready for production systems yet. You are encouraged to pass the --enable-experimental flag to ./configure when compiling ClamAV. The experimental code introduces many improvements in terms of detection rate and performances. If you find a bug, please take some time to report it on our bugzilla: https://bugzilla.clamav.net. Your help in testing the new code is really appreciated. The experimental code introduces many improvements in terms of detection rate and performances.

RAR3, SIS and SFX archives support is finally available together with new unpackers and decryptors: pespin, sue, yc, wwpack32, nspack, mew, upack and others. Additionally, ClamAV now includes better mechanisms for scanning ELF, PDF and tar files. The email decoding has been improved to reduce both the memory requirements and the time taken to process attachments.

As part of the Google Summer of Code program, we have introduced support for a new phishing signatures format that has proved very effective in detecting phishing emails. The ClamAV phishing module allows better and more generic detection of phishing emails by searching for URLs in email messages, and comparing the real site with the URL displayed to the user in the message.

On the performance side, support for the MULTISCAN command has been implemented in clamd, allowing to scan multiple files simultaneously. Support for Sensory Networks' NodalCore acceleration technology (https://www.clamav.net/nodalcore/) is now available in ClamAV and will be compiled in if the ncore libraries are detected at compile time. NodalCore acceleration allows highly improved scan speeds on systems equipped with NodalCore cards.

Detailed list of changes:

• libclamav:

  • New unpacker for RAR3, RAR2 and RAR1
  • Rewritten unpackers for Zip and CAB files
  • Support for RAR-SFX, Zip-SFX and CAB-SFX archives
  • New PE parsing model:
    • Accurate virtual and raw size and offset calculations
    • Proper parsing of executables with weird/handcrafted/uncommon headers
    • Proper handling (or skipping) of ghost sections at various places in the code
    • Rebuild improvements for various unpackers
    • Adjusted alignment on rebuilt executables
    • Proper handling of out of sections offsets
    • Broken exe detection now mimics the XPSP2 loader
    • Lots of misc improvements and fixes
  • Support for PE32+ (64-bit) executables
  • Support for MD5 signatures based on PE sections (.mdb)
  • ELF file parser
  • Support for Sensory Networks' NodalCore hardware acceleration technology
  • Advanced phishing detection module (experimental)
  • Signatures are stored in separate trees depending on their target type
  • Algorithmic detection can be controlled with CL_SCAN_GENERAL_HEURISTICS
  • Support for new obfuscators: SUE, Y0da Cryptor, CryptFF
  • Support for new packers: NsPack, wwpack32, MEW, Upack
  • Support for SIS files (SymbianOS packages)
  • Support for PDF and RTF files
  • New encoding and entity normalizer (experimental)

• clamd:

  • New config file parser:
    • all options require arguments (options without args must be now followed by boolean values: (yes, no), (1, 0), or (true, false)
    • optional arguments (as in NotifyClamd) are no longer supported
    • removed "DisableDefaultScanOptions" option (scan options can be configured individually)
  • TCP and local sockets can be operated simultaneously
  • New command: MULTISCAN (scan directory with multiple threads)
  • New option AlgorithmicDetection
  • New option ScanELF
  • New option NodalCoreAcceleration (requires hardware accelerator)
  • New option PhishingSignatures
  • New options to control the phishing module:
    • PhishingRestrictedScan
    • PhishingScanURLs
    • PhishingAlwaysBlockSSLMismatch
    • PhishingAlwaysBlockCloak

• clamav-milter:

  • Black list mode: optionally black lists an IP for a configurable amount of time
  • Black hole mode: detects emails that will be discarded and refrains from scanning them
  • Reporting: ability to report phishing attempts to anti-phishing organisations to help close the sites
  • Improved load balancing for scanning with clusters
  • Removed -b option (enable BOUNCE compile time option to re-enable the option)

• clamscan:

  • New options: --no-phishing-sigs, --no-algorithmic (disable phishing and algorithmic detection respectively)
  • New options to control the phishing module: --no-phishing-scan-urls, --no-phishing-restrictedscan, --phishing-ssl, --phishing-cloak
  • New option: --ncore (requires hardware accelerator)
  • New option: --no-elf
  • New option: --copy

• freshclam:

  • Interpreter for .cdiff files (scripted updates)
  • Initial version of mirror manager
  • New option: --list-mirrors (list details on mirrors accessed by the mirror manager)
  • New option HTTPUserAgent to force different User-Agent header

• sigtool:

  • New option: --utf16-decode (decode UTF16 encoded files)
  • New options: --diff, --run-cdiff, --verify-cdiff (update script management)
  • New option: --mdb (generated .mdb compatible signatures)

• clamconf: initial version of configuration utility for clamd and freshclam

We are happy to announce new interesting software with support for ClamAV:

• AqMail - a POP3 client with additional filtering
• ClamFS - a FUSE-based file system with on-access anti-virus scanning
• c-icap - an ICAP server coded in C with support for ClamAV
• MailCleaner - a complete email filtering gateway
• mod_streamav - a ClamAV based antivirus filter for Apache 2
• pyClamd - a python interface to Clamd

More information at https://www.clamav.net/download.html#tools

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.7

This version improves scanning of mail and tar files.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.6

Changes in this release include better handling of network problems in freshclam and other minor bugfixes.

The ClamAV developers encourage all users to give a try to the latest beta version of 0.90!

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.5

This version fixes a crash in the CHM unpacker and a heap overflow in the function rebuilding PE files after unpacking.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.4

This release fixes a possible heap overflow in the UPX code.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.3

This version fixes handling of large binhex files and multiple alternatives in virus signatures.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.2

This release improves virus detection, fixes zip handling on 64-bit architectures and possible security problem in freshclam.

Following the 0.88.1 release some portals and security related websites published incorrect information on security problems of 0.88. To avoid such incidents in the future, every new ClamAV package will be released together with detailed information about security bugs it fixes.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88.1

This version fixes a number of minor bugs and provides code updates to improve virus detection.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.88

A possible heap overflow in the UPX code has been fixed. General improvements include better zip and mail processing, and support for a self-protection mode. The security of the UPX, FSG and Petite modules has been improved, too.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.87.1

This release includes major bugfixes for problems with handling TNEF attachments, cabinet files and FSG compressed executables.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.87

This version fixes vulnerabilities in handling of UPX and FSG compressed executables. Support for PE files, Zip and Cabinet archives has been improved and other small bugfixes have been made. The new option "--on-outdated-execute" allows freshclam to run a command when system reports a new engine version.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.86.2

Changes in this release include fixes for three possible integer overflows in libclamav, improved scanning of Cabinet and FSG compressed files, better database handling in clamav-milter, and others.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.86.1

A possible crash in the libmspack's Quantum decompressor has been fixed.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.86

This release introduces a number of bugfixes and cleanups. Possible descriptor leaks in archive unpackers and mishandling of fast track uuencoded files have been fixed in libclamav. Database reloading in clamav-milter has been improved.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.85.1

A problem where an email with more than one content-disposition type line, one or more of which was empty, could crash libclamav has been fixed. Other minor bugfixes have been made.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.85

Bugfixes in this release include correct signature offset calculation in large files, proper handling of encrypted zip archives, and others.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.84

This version improves detection of JPEG (MS04-028) based exploits, introduces support for TNEF files and new detection mechanisms. Various bugfixes (including problems with scanning of digest mail files) and improvements have been made.

• libclamav:

  • JPEG exploit detector now also checks embedded Photoshop thumbnail images
  • archive meta-data scanner (improves malware detection within encrypted archives)
  • support for TNEF (winmail.dat) decoding
  • support for all tar archive formats
  • MD5 implementation replaced with a slightly faster one
  • improved database reloading with reference counter
  • database updateable false positive eliminator
  • speed improvements
  • various bugfixes

• clamd:

  • VirusEvent now sets CLAM_VIRUSEVENT_FILENAME and CLAM_VIRUSEVENT_VIRUSNAME environment variables

• clamav-milter:

  • improved database update detection when not --external

• clamscan:

  • new options --include-dir and exclude-dir
  • new option --max-dir-recursion

• freshclam:

  • new directive LocalIPAddress

• contrib:

  • clamdmon 1.0 - clamdwatch replacement written in C

• 3rd party software:

  • hMailServer - open source e-mail server for Microsoft Window
  • pop3.proxy - proxy server for the POP3 protocol
  • HTTP Anti Virus Proxy
  • SmarterMail Filter - ClamAV based plugin for SmarterMail Mail Server
  • smf-clamd - small & fast virus filter for Sendmail
  • Squidclam - replacement for SquidClamAV-Redirector.py written in C
  • QtClamAVclient - remote clamd client based on the Qt Toolkit
  • qpsmtp - flexible smtpd daemon written in Perl

News:

Palo Alto, Calif. March 31st 2005 - Clam AntiVirus, the leading Open Source antivirus toolkit, and Sensory Networks, the leading provider of hardware acceleration for network security applications, announced a partnership to provide hardware acceleration support for the Clam AntiVirus suite. [...] Support for Sensory Networks' NodalCore acceleration in ClamAV will be available in version 0.90 of the software suite in Q3 2005. For more information please visit: http://www.sensorynetworks.com/

The ClamAV project announces the opening of the official merchandise store:

http://www.cafepress.com/clamav/

A big thank you to Finndesign (http://www.finndesign.fi) which volunteered to design the whole line of products, including:

• t-shirts (for women and men)
• golf shirt
• sweatshirt
• coffee mug
• mousepad
• stickers
• scrapbook

By purchasing our merchandise, you contribute to the development of ClamAV.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.83

Due to a high number of bad files produced by broken software, the MS05-002 exploit detector now only checks specific RIFF files. This version also fixes a stability problem of clamav-milter/clamd and improves e-mail scanning.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.82

This release adds generic detection of MS05-002 ("Vulnerability in Cursor and Icon Format Handling Could Allow Remote Code Execution") based exploits. Fixes include correct attachment scanning in e-mails generated by some Internet worms (broken in 0.81), removed false positive "Suspect.Zip" warning on non-standard zip archives created by ICEOWS, better proxy support in freshclam, and speed improvements.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.81

Scan engine improvements were made. The internal mail scanner now supports multipart/partial messages, and support for decoding non-standard mail files was greatly enhanced. clamav-milter by default uses libclamav and scans emails itself without the use of clamd. libclamav can now extract RFC2397 encoded data within HTML documents, block zip archives with modified information in local header, and scan HQX files. PE file structure rebuilding from compressed executables was improved.

Important note to clamdwatch users: please upgrade to the latest version (contrib/clamdwatch) as soon as possible.

• libclamav:

  • major improvements in the mail scanning engine:

  • support for multipart/partial messages

  • improved support for non-standard quoted-printable attachments

  • in some situations it will try to guess a correct mode (e.g. a good type for an incorrect content-type, a best guess for an unknown encoding type, etc.)

  • handling of RFC822 comments in the commands (e.g.: Co(foo)ntent-Type: text/plain)

  • better recovery if memory softlimit is hit

  • new test code that decodes emails without parsing them first (must be enabled manually before compilation)

    • support for extracting RFC2397 encoded data within HTML documents
    • blocking of zip archives with modified information in local header
    • improved PE structure rebuilding from compressed executables
    • improved support for zip archives
    • support for Mac's HQX file format
    • stability and (minor) security fixes
    • a lot of minor improvements, including support for new platforms

• clamd:

  • new directive ExitOnOOM (stop the deamon when libclamav reports an out of memory condition)
  • new directives StreamMinPort and StreamMaxPort (port range specification for a stream mode)
  • support for passing of file descriptors

• clamdscan:

  • added support for --move and --remove

• clamav-milter:

  • by default uses libclamav to scan e-mails
  • new option --external (enables the use of clamd)
  • various optimizations

• freshclam:

  • the DNS mode is now enabled by default (no need for DNSDatabaseInfo in freshclam.conf)
  • --no-dns uses a If-Modified-Since method instead of a range GET
  • added support for AllowSupplementaryGroups

• sigtool:

  • new options --vba and --vba-hex (extract VBA/Word6 macros and optionally display the corresponding hex values; Word6 binary code will be disassembled)

• The list of third party programs with support for ClamAV is growing rapidly. Here are the latest additions (see clamdoc.pdf for details):

  • AVScan - a libclamav based GUI a-v scanner for Unix
  • clamailfilter - a Python script that provides a-v scanning via procmailrc
  • ClamAVPlugin - A ClamAV plugin for SpamAssassin 3.x
  • ClamCour - an e-mail filter for Courier
  • clamfilter - a small, secure, and efficient content filter for Postfix
  • ClamMail - an anti-virus POP3 proxy for Windows
  • ClamShell - a Java GUI for clamscan
  • ClamTk - a perl-tk GUI for ClamAV
  • clapf - a virus scanning and antispam content filter for Postfix
  • D bindings for ClamAV - ClamAV bindings for the D programming language
  • Frox - a transparent FTP proxy
  • KMail - a fully-featured email client now supports ClamAV out of box
  • Mail Avenger - a highly-configurable SMTP server with a-v support
  • Mailnees - a mail content filter for Sendmail and Postfix
  • Maverix - anti-spam and anti-virus solution for AOLServer
  • Moodle - scan files submitted by students for viruses!
  • php-clamav - scan files from within PHP
  • pymavis - a powerful email parser, similar to the old amavis-perl
  • QClam - a simple program to plug ClamAV to a qmail mailbox
  • qmailmrtg7 - display graphs of viruses found by ClamAV
  • qSheff - an e-mail filter for qmail
  • SafeSquid - a feature rich content filtering internet proxy
  • Scrubber - a server-side daemon for filtering mail content
  • simscan - an e-mail and spam filter for qmail
  • smtpfilter - scan SMTP session for viruses
  • snort-inline - scan your network traffic for viruses with ClamAV
  • SquidClamAV Redirector - a Squid helper script which adds virus scanning
  • WRAVLib - a library for a-v integration with Mono/.NET applications

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.80

Stable version. Please read the release notes for the candidate versions below.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.80rc4

Improvements in this release include better JPEG exploit verification, faster base64 decoding, support for GNU tar files, updated on-access scanner, and others.

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.80rc3

This release candidate eliminates possible false positive alerts in UPX/FSG compressed files and clarifies behaviour of default actions in clamd and freshclam.

We encourage users to take advantage of our new mirror structure. In order to download the database from the closest mirror you should configure freshclam to use db.XY.clamav.net where XY is your country code (see http://www.iana.org/cctld/cctld-whois.htm for the full list). Please add the following lines to freshclam.conf:

DNSDatabaseInfo current.cvd.clamav.net
DatabaseMirror db.XY.clamav.net
DatabaseMirror database.clamav.net

DNSDatabaseInfo enables database and software version verification through DNS TXT records, and the second database mirror acts as a fallback in case a connection to the first mirror fails for some reason.

0.80rc2

This update fixes a serious bug in e-mail scanner.

0.80rc

The development version of ClamAV is ready for general testing! New mechanisms have already proved very nasty to Internet worms successfully protecting against the new versions R, S, T, U, V and W of the infamous Mydoom worm and detecting them as Worm.Mydoom.Gen before they were analysed and specific signatures added by the ClamAV database maintainers. That means servers running the new version of ClamAV have detected and blocked 100% of Mydoom attacks!

New features in this release include:

• libclamav

  • Portable Executable analyser (CL_SCAN_PARSE_PE) featuring:
  • UPX decompression (all versions)
  • Petite decompression (2.x)
  • FSG decompression (1.3, 1.31, 1.33)
  • detection of broken executables (CL_SCAN_HEURISTIC_BROKEN)
  • new, memory efficient, pattern matching algorithm (multipattern variant of Boyer-Moore) - it's now primary matcher and Aho-Corasick is only used for regular expression extended signatures
  • new signature format with advanced target type and offset specification
  • support for MD5 based signatures
  • extended regular expression scanner
  • added support for MS cabinet files
  • added support for CHM files
  • added support for POSIX tar archives
  • scanning inside PowerPoint documents
  • HTML normaliser with support for decoding of MS Script Encoder code
  • great improvements in e-mail scanner (now handles even more worm tricks)
  • new method of mail files detection
  • all e-mail attachments are now scanned (previously only the first ten attachments were scanned)
  • added support for scanning URLs in e-mails (CL_SCAN_PARSE_MAILURL)
  • detection of Worm.Mydoom.M.log
  • updated API (still backward compatible but please consult clamdoc.pdf (Section 6) and adapt your software)

• clamd

  • new directive ScanHTML (enables HTML normalisator and ScrEnc decoder)
  • new directive ScanPE (win32 executable analyser and decompressor)
  • new directive DetectBrokenExecutables (try to detect broken executables and mark them as Broken.Executable)
  • new directive MailFollowURLs (try to download and scan files from URLs in mails. BE CAREFUL! DO NOT ENABLE IT ON LOADED MAIL SERVERS)
  • new directive ArchiveBlockMax (archives that exceed limits will be marked as viruses)
  • clamav.conf was renamed clamd.conf

• clamscan

  • mail files are scanned by default, use --no-mail to disable it
  • new option --no-html (disables HTML normalisator)
  • new option --no-pe (disables PE analyser)
  • new option --detect-broken
  • new option --block-max
  • new option --mail-follow-urls (download and scan files from URLs in mails)

• clamdscan

  • now prints warnings if some activated command line options are only supported by clamscan
  • added support for archive scanning in stdin mode

• clamav-milter

  • improved template file format
  • quarantined file names now contain virus names
  • initial support for SESSION mode of clamd

• freshclam:

  • new directive DNSDatabaseInfo that enables ultra lightweight version verification method through DNS (using TXT records). Based on idea by Christopher X. Candreva and enabled by default. (see http://www.gossamer-threads.com/lists/clamav/users/11102)
  • new option --no-dns (quick option to disable DNS method without editing freshclam.conf)

• sigtool

  • removed ability of automatic signature generation (use MD5 sums to create your own signatures, see signatures.pdf for details)
  • new option --md5
  • new option --html-normalise (saves HTML normalisation and decryption results in three html files in current directory)

• configure:

  • new option --disable-gethostbyname_r (try enabling it if clamav-milter compilation fails)
  • new option --disable-dns (try enabling it if freshclam compilation fails)
  • extended regular expression scanner

• documentation

  • included new Mac OS X installation instructions
  • official documentation rewritten and outdated docs removed

• new 3rd party software with support for ClamAV:

  • OdeiaVir - an e-mail filter for qmail and Exim
  • ClamSMTP - a lightweight (written in C) and simple filter for Postfix
  • Protea AntiVirus Tools - a virus filter for Lotus Domino
  • PTSMail Utilities - an e-mail filter for Sendmail
  • mxGuard for IMail - a mail filter for Ipswitch IMail (W32)
  • Zabit - a content and attachment filter for qmail
  • BeClam - ClamAV port for BeOS
  • clamXav - a virus scanner with GUI for Mac OS X

Special thanks to aCaB for his work on UPX, FSG and Petite decompressors.

Thanks to good reaction times on new threats ClamAV was awarded as best security tool for 2004 by Linux Journal: "...With this year's outbreak of e-mail worms for non-Linux platforms, ClamAV has been getting quite a workout, and Linux admins on mailing lists report that database update times are keeping up with or beating the proprietary alternatives." Thanks!

SourceWear.com is selling some very nice t-shirts and polo shirts powered by ClamAV. Wear them and virus writers will stay away from you :- A quarter out of every dollar profited from the sale of these shirts will go to the ClamAV project. Visit http://www.sourcewear.com and click on ClamAV logo!

-- The ClamAV team (https://www.clamav.net/about.html#credits)

0.75

This release fixes detection of e-mails generated by Worm.Mydoom.I.

Important notice for people using ClamAV 0.60:

Our logs show that there is still a small percentage of ClamAV 0.60
installations updating their database. ClamAV 0.60 was released on
July 29th, 2003 and it was the last release to use the old database
format. Starting from version 0.65, released on November 12nd, ClamAV
uses a new database format, which is compressed and digitally signed.
We have been distributing the database in both formats till now, but
we plan to drop support for ClamAV 0.60 on September 1st.

We encourage _all_ users to upgrade to the latest release available.
People running an old version of ClamAV are missing many viruses and
may experience stability problems.

On non-production systems you can try the latest development version.
The new engine not only speeds up the scanning process but also limits
memory usage by about 8 MB ! It's able to scan new formats, including
CAB, CHM, UPX, HTML (normalisation), PowerPoint macros and can detect
annoying e-mails with empty attachments generated by new Bagle variants.

--
The ClamAV team (https://www.clamav.net/about.html#credits)

## 0.74

Bugfixes in this version include crashes with multipart/mixed messages
and corrupted OLE2 and Zip files. Improvements include various optimizations
of mail scanning and clamav-milter and clamdscan behaviour.

New members of our "3rd party software" list:

  - MyClamMailFilter   an e-mail filter for procmail (written in C)
  - clamaktion         scan files from the right-click Konqueror menu
  - QMVC               Qmail Mail and Virus Control
  - pyclamav           Python binding for ClamAV
  - FETCAV             Front End To Clam AntiVirus based on Xdialog
  - Famuko             an on-access scanner working in a userspace
  - SoftlabsAV         a generic anti-virus filter for procmail

Japanese users can take an advantage of the new ClamAV related site:
    http://clamav-jp.sourceforge.jp/
and join the clamav-jp-users mailing list.

--
The ClamAV team (https://www.clamav.net/about.html#credits)

## 0.73

This version fixes memory management problems in the OLE2 decoder and
improves mail scanning.

Thank you for using ClamAV !

--
The ClamAV team (https://www.clamav.net/about.html#credits)

## 0.72

Major bugfixes in this release include crashes with corrupted BinHex messages
and some Excel documents. Protection against archive bombs (not fully
functional since 0.70) was improved and a number of other improvements were
made.

--
The ClamAV team (https://www.clamav.net/about.html#credits)

## 0.71

This release fixes all bugs found in 0.70 and introduces a few new features -
the noteworthy changes include:

- libclamav:
  - support nested OLE2 files
  - support Word6 macro code
  - ignore popular file types (media, graphics)
  - support compress.exe (SZDD) compression (test/test.msc)
  - improve virus detection in e-mails

- clamscan:
  - automatically decide (by comparing daily.cvd version numbers) which
    database directory (hardcoded or clamav.conf's one) to use
  - support compression ratio feature (--max-ratio)
  - allow regular expressions in --[in|ex]clude
  - do not overwrite old files in a quarantine directory but add a numerical
    extension to new files
  - respect --tempdir in libclamav
  - fix access problem when calling external unpackers in a superuser mode
  - fix file permission corruption with --deb in a superuser mode

- clamd
  - support log facility specification in syslog's style (LogFacility)
  - new directive LeaveTemporaryFiles (Debug no longer leaves temporary
    files not removed)

- clamav-milter:
  - include the virus name in the 550 rejection
  - support user defined template for virus notifications (--template-file)
  - sort quarantine messages by date
  - improve thread management
  - add X-Virus-Scanned and X-Infected-Received-From: headers
  - improve load balancing (when using remote servers with --server)
  - send 554 after DATA received, not 550
  - save PID (--pidfile)

- documentation:
  - German clamdoc.pdf translation (Rupert Roesler-Schmidt and Karina
    Schwarz, uplink coherent solutions, http://www.uplink.at)
  - new Japanese documentation (Masaki Ogawa)

--
The ClamAV team (https://www.clamav.net/about.html#credits)

## 0.70

The two major changes in this version are new thread manager in clamd
and support for decoding MS Office VBA macros. Both of them have been
implemented by Trog. Besides, there are many improvements and bugfixes
(all listed in ChangeLog), a short summary:

- clamd
  - new thread manager (with better SMP support)
  - on-access scanning now also available on FreeBSD (with Dazuko 2.0)
  - new directive ArchiveBlockEncrypted
  - new directive ReadTimeout (replaces ThreadTimeout)
  - handle SIGHUP (re-open logfile) and SIGUSR2 (reload database)
  - respect TCPAddr in stream scanner

- clamav-milter:
  - TCPWrappers support

- libclamav:
  - support MS Office documents (OLE2) and VBA macro decoding
  - support encrypted archive detection
  - new flags: CL_OLE2, CL_ENCRYPTED (see clamdoc.pdf, Section 6.1)
  - improve virus detection in big files
  - improve support for multipart, bounce and embedded RFC822 messages
  - improve RAR support
  - include backup snprintf implementation

- clamscan:
  - new option: --block-encrypted

- freshclam
  - new option: --pid, -p (write pid file if run as daemon)
  - handle SIGHUP (re-open logfile), SIGTERM (terminate with log message),
    SIGALRM and SIGUSR1 (wake up and check mirror)
  - fix bug with -u and -c handling

- contrib
  - windows clamd client now available with source code

- documentation:
  - new Polish documentation on ClamAV and Samba integration
  - official documentation updated

Special thanks to Dirk Mueller <mueller*kde.org> for his code review,
many bugfixes and cleanups.

Thanks to the help of many companies we have 49 very fast and reliable
virus database mirrors in 22 regions and the number is still growing.
As of March 2004 we attempt to redirect our users to the closest pool
of mirrors by looking at their ip source address when they try to resolve
database.clamav.net. Our DNS servers can answer with a CNAME to:
db.europe.clamav.net, db.america.clamav.net, db.asia.clamav.net or
db.other.clamav.net. Our advanced push-mirroring mechanism (maintained by
Luca Gibelli) allows database maintainers to update all the mirrors in less
than one minute !

There will be no major feature enhancements in the 0.7x series. Our work
will be concentrated on a new scanning engine and preliminary heuristics -
please help us and test CVS snapshots from time to time.

We are happy to announce new programs with support for ClamAV (all of them
have been reviewed by our team - more info in the documentation and
on our website: https://www.clamav.net/download.html#tools):

- ClamWin - a GUI for Windows (!)
- KlamAV - a collection of GUI tools for using ClamAV on KDE
- clamscan-procfilter - a Perl procmail filter
- j-chkmail - a powerful filter for sendmail
- qscanq - Virus Scanning for Qmail
- clamavr - a Ruby binding for ClamAV
- DansGuardian Anti-Virus Plugin
- Viralator - a Perl script that virus scans http downloads
- ClamAssassin - a filter for procmail
- Gadoyanvirus - a filter for Qmail
- OpenProtect - a complete e-mail protection solution
- RevolSys SMTP kit for Postfix - an antispam/antivirus tools installation
- POP3 Virus Scanner Daemon
- mailman-clamav - a virus filter for Mailman
- wbmclamav - a webmin module to manage ClamAV
- Scan Log Analyzer
- mailgraph - a RRDtool frontend for Postfix Statistics
- INSERT - a security toolkit on a credit card size CD
- Local Area Security - a Live CD Linux distribution

--
The ClamAV team (https://www.clamav.net/about.html#credits)
April 17, 2004

## 0.68-1

Fixed RAR support.

## 0.68

This version fixes a crash with some RAR archives generated by the Bagle worm,
also a few important fixes have been backported from CVS.

We strongly encourage users to install the 0.70-rc version (released today).

## 0.67

This release fixes a memory management problem (platform dependent; can lead
to a DoS attack) with messages that only have attachments (reported by Oliver
Brandmueller). It also contains patches for a few problems found in 0.66 and
has better Cygwin support.

## 0.66

This version is a response to the "clamav 0.65 remote DOS exploit" information
published on popular security-related mailing lists. Unfortunately we had
not been contacted by the author before he published that and had to release
this (unplanned) package very quickly (it should be mentioned that CVS version
was not vulnerable to the exploit). Untested code has been disabled also
the Dazuko support is temporarily not available (if you really need it please
use a CVS version or wait for a next stable release). Other noteworthy changes:

- clamd:
  - fixed database timestamp handling (and a double reload problem reported
    by Alex Pleiner and Ole Stanstrup)
  - new directive: ArchiveMaxCompressionRatio
  - new command: SESSION (starts a clamd session and allows to do multiple
    commands per TCP session)
  - new directives: TemporaryDirectory, LogClean (Andrey V. Malyshev)

- clamav-milter: (Nigel Horne)
  - added support for AllowSupplementaryGroups and ThreadTimeout
  - added --quarantine-dir (thanks to Michael Dankov)
  - added --noreject (thanks to Vijay Sarvepalli)
  - added --headers (thanks Leonid Zeitlin)
  - added --sign option

- libclamav:
  - detect Worm.SCO.A bounces (Nigel)
  - prevent buffer overflow in broken uuencoded files (Nigel)
  - scan multipart alternatives that have no boundaries (Nigel)
  - better handling of encapsulated messages (Nigel)
  - locate uuencoded viruses hidden in text portions of multipart/mixed
    mime messages (Nigel)
  - initial support for BinHex (Nigel)
  - fixed a mail recursion loop (problem reported by Alex Kah and Kristof
    Petr)
  - fixed bzip2 memory limit (improper call suggested by the buggy libbz2
    documentation, problem reported by Tomasz Klim)
  - fixed on error descriptor leak in CVD unpacker (Thomas Lamy)
  - fixed memory leak in digital signature verification code (Thomas Lamy)
  - added maximal compression ratio limit (cl_limits->maxratio)

- clamscan:
  - support for multiple arguments on command line (Thomas Lamy)
  - fixed buffer overflow in --move (Denis De Messemacker)
  - removed support for sendfile() under Linux

- freshclam:
  - support for freshclam.conf (that may be optionally merged with
    clamav.conf, command line options overwrite config settings)
  - work-around for potential database downgrade (subtle problem
    in r-r dns handling) - reported by Daniel Mario Vega and patched
    by Luca Gibelli

- sigtool:
  - list virus names with --list-sigs (-l)

- contrib:
  - clamdwatch (by Mike Cathey)
  - windows clamd client with drag&drop support (Nigel Horne)

- documentation:
  - complete clamdoc.pdf French translation by Stephane Jeannenot
  - Polish how-to on ClamAV and Sendmail integration (with clamav-milter)
    by Przemyslaw Holowczyc

News:

ClamAV was the first anti-virus protecting against Worm.SCO.A (aka MyDoom.A) !
The signature was published by Diego d'Ambra in the daily update 105,
26-Jan-2004 20:23 GMT and we were at least two hours faster than "big" AV
vendors:
http://sourceforge.net/mailarchive/forum.php?thread_id=3764826&forum_id=34654
http://www.pcwelt.de/news/viren_bugs/37278/4.html

clamav-devel is finally able to decode OLE2 (Microsoft Office) files and
decompress VBA streams ! The code is developed by Trog, official ClamAV
developer. Also we're testing new clamd implementation that will solve
several important problems (especially that "Time out" related). Please
help us and test the latest CVS version.

The virus database now contains more than 20.000 signatures ! On January 8,
Denis De Messemacker (who joined our team 3 months ago) added signatures for
about 7700 new viruses. Also special thanks go to Tomasz Papszun for his
hard work on daily submissions and forcing us to keep ClamAV quality on
the highest possible level.

New mirroring mechanisms. Luca Gibelli (ClamAV) and mirror administrators
(22 sites) are converting mirrors to new "push mirroring"
method. It uses advanced techniques to ensure all the mirrors are up to date.

We would like to thank our donors:

- Jeremy Garcia (http://www.linuxquestions.org)
- Andries Filmer (http://www.netexpo.nl)
- David Eriksson (http://www.2good.nu)
- Dynamic Network Services, Inc (http://www.dyndns.org)
- epublica
- Invisik Corporation (http://www.invisik.com)
- Keith (http://www.textpad.com)
- Explido Software USA Inc. (http://www.explido.us)
- cheahch from Singapore
- Electric Embers
- Stephane Rault
- Brad Koehn
- David Farrick
- ActiveIntra.net Inc. (http://www.activeintra.net)
- An anonymous donor from Colorado, US

--
Tomasz Kojm <tkojm*clamav.net>
February 10, 2004

## 0.65

IMPORTANT NOTE: The project has been moved into SourceForge. The only official
ClamAV's homepage is www.clamav.net (however clamav.elektrapro.
com still works). We would like to thank ElektraPro.com for
their support for the open-source community  - THANKS !

ClamAV 0.65 introduces a new database container file format (called CVD) with
support for digital signatures and compression. Please remove the old
databases from your database directory before the installation. And the most
important thing: clamd stability has been greatly improved (especially under
FreeBSD) ! Also we have a new mirror infrastructure - you will find all the
details in clamdoc.pdf. If you want to become an official ClamAV mirror
(with entry in database.clamav.net) please read the clamav-mirror-howto.pdf
document and contact our administrator - Luca Gibelli <nervous*clamav.net>.

Noteworthy changes in this version:

- clamd:
  - fixed a race condition in database reloading code (random crashes
    under high load)
  - fixed a race condition with the improperly initialized session start time
    (thanks to Michael Dankov)
  - fixed PidFile permissions (Magnus Ekdahl, bug reported by Tomasz Papszun)
  - fixed LogFile permissions (Magnus Ekdahl)
  - new directive ScanRAR (because RAR support is now disabled by default)
  - new directive VirusEvent
  - new directive FixStaleSocket (Thomas Lamy and Mark Mielke)
  - new directive TCPAddr (Bernard Quatermass, fixed by Damien Curtain)
  - new directive Debug

- clamav-milter: (Nigel Horne <njh*clamav.net>)
  - new --force-scan flag
  - new -P and -q flags by Nicholas M. Kirsch
    WARNING: clamav-milter and our mail scanner are still in high development
    and may be unstable. You should always use the CVS version.

- libclamav:
  - support for a new database container format (CVD) - compressed and
    digitally signed
  - better protection against malformed zip archives (such as Mimail)
  - mail decoder fixes (thanks to Rene Bellora, Bernd Kuhls, Thomas Lamy,
    Tomasz Papszun) (Nigel Horne)
  - memory leak fixes (Thomas Lamy)
  - new scan option CL_DISABLERAR (disables built-in RAR unpacker)

- freshclam:
  - fixed --on-error-execute behaviour (David Woakes)
  - new option --user (-u) USER - run as USER instead of the default user.
    Patch by Damien Curtain.
  - rewritten to use database.clamav.net and CVD

- documentation:
  - new Spanish documentation on ClamAV and Sendmail integration by
    Erick Ivaan Lopez Carreon
  - included clamdoc.pdf Turkish translation by yavuz kaya and �brahim erken
  - included clamav-mirror-howto.pdf by Luca Gibelli
  - included clamd+daemontools HOWTO by Jesse D. Guardiani
  - included signatures.pdf
  - man pages: updated
  - clamdoc.pdf: rewritten

New members of our list of ClamAV certified software (see clamdoc.pdf for
details):
  - cgpav
  - smtp-vilter
  - IVS Milter
  - scanexi
  - Mail::ClamAV
  - OpenAntiVirus samba-vscan
  - Sylpheed Claws
  - nclamd

Thanks to Mia Kalenius and Sergei Pronin we have a new official logo !

Thank you for using ClamAV !

--
Tomasz Kojm <tkojm*clamav.net>
November 12, 2003

## 0.60

Hello again...

This is a new, (very?) stable release of Clam AntiVirus. 0.60 was developed
and stabilized for over seven months and many people had contributed to the
final release. This version introduces many enhancements and a new program:
clamav-milter written by ClamAV developer Nigel Horne. This is a mail scanner
for Sendmail/milter written entirely in C, which uses clamd for virus scanning.
Clamav-milter and clamd duet is a powerful solution for systems where high
performance is required. Please check clamdoc for more detail.

    Many people get confused with ClamAV database status because of
    the OpenAntiVirus update information at:
    http://openantivirus.org/latest.php
    (last update at 17 October, 2002). The ClamAV virus database contains
    the OAV database (with some signatures fixed or removed) but we
    develop it independently of the OAV project. Our database is updated
    frequently (on average 4-5 times a week). You can help (or join) us -
    will find some basic but useful instructions at
    http://clamav.elektrapro.com/doc/signatures.pdf

News from ClamAV world:

- New email address for virus submitting: [email protected]
   You don't need to encrypt a virus sample, but if your system doesn't allow
   you to send infected files just put it into an encrypted zip archive
   (password: virus)

   Special thanks to Nicholas Chua, Diego D'Ambra, Hrvoje Habjanic, Nigel Kukard
   and Chris van Meerendonk for a big number of samples submitted.

- New mailing list: [email protected]
   After each update an email with subject "[clamav-virusdb] Update" and a list
   of viruses added is sent to it. You can set up a procmail rule for freshclam
   to react on such a mails (and update the database just after an update).

- New official mirrors:
  - clamav.ozforces.com: database mirror updated manually (thanks to
    Andrew <[email protected]>)
  - clamav.essentkabel.com: full (automatic) mirror of clamav.elektrapro.com
    (thanks to Chris van Meerendonk <[email protected]>)
  - clamav.linux-sxs.org: database mirror - rsync from clamav.ozforces.com
    (thanks to Douglas J Hunley <[email protected]>)

    FreshClam will automatically use them when the main server is not
    accessible.

- Official port in FreeBSD available ! (maintained by Masahiro Teramoto
   <[email protected]>)

- Unofficial port for OpenBSD is available at:
	http://www.activeintra.net/openbsd/article.php?id=5
  (maintained by Flinn Mueller <[email protected]>)

- there are many new programs that use ClamAV, eg. mod_clamav (Apache
  virus scanning filter), clamdmail or Sagator. You will find more
  info in clamdoc.

Changes:

- libclamav:
  - fixed buffer overflow in unrarlib (patch by Robbert Kouprie
    <[email protected]>)

  - various mbox code updates (fixed memory leak; added support for decoding
    viruses sent in message bodies, detection of viruses that put their
    payloads after the end of message marker (thanks to Stephen White
    <[email protected]> for the bug report and useful CGI tools);

  - zziplib updated to 0.10.81 (some problems with older version were reported
    by Martin Schitter)
  - direct scanning of mbox/maildir files (new directive CL_MAIL)
  - file scanner optimization (patch by Hendrik Muhs
    <[email protected]>)
  - bzip2 support
  - faster detection of malformed Zip archives (eg. 'Zip of Death'), they are
    reported as a viruses
  - fixed strcasecmp() compile problem in zziplib on Free/NetBSD and others

- clamd:
  - fixed descriptor leak in directory scanner - it was causing random
    clamd crashes and locks, especially on highly loaded servers. Reported
    by Kristof Petr <[email protected]>.

  - fixed crash with archive scanning on BSD (increased thread stack size)
    (Nigel Horne)
  - fixed CONTSCAN command (used by clamdscan) - it had archive support
    disabled (hardcoded)
  - fixed SelfCheck option (there was a logic bug, and the option was
    disabled) it now checks a databases time stamps and reloads them
    if needed.
  - fixed possible writing to undefined descriptors (bug found by
    Brian May <[email protected]>)
  - new STREAM command (scanning data on socket) and directives:
    StreamSaveToDisk (save stream to disk to allow scanning within archives),
    StreamMaxLength. This option allows scanning data on socket (might be
    sent from another host), currently only clamav-milter uses this.

  - new ScanMail directive for scanning into mbox/Maildir files
  - new directive: ArchiveLimitMemoryUsage (limit memory usage with bzip2)
  - new directive: AllowSupplementaryGroups (feature requested by Exiscan
    users)
  - syslog support (LogSyslog) (patch by Hrvoje Habjanic
    <[email protected]>)
  - fixed parser segfault with extra space between option and argument
    in config file (Magnus Ekdahl <[email protected]>)

- clamscan:
  - fixed --remove option (didn't work when the file was scanned with an
    internal unpacker) (patch by Damien Curtain <[email protected]>)
  - --move option for moving infected files into a specified directory
    (by Damien Curtain <[email protected]>)
  - --mbox enables a direct support for mbox files
    (ex. clamscan --mbox /var/spool/mail)
  - fixed --log (-l) option
  - fixed -i option (patch by Magnus Ekdahl <[email protected]>)
  - enabled default archive limits (max-files = 500, max-size = 10M,
    max-recursion = 5)
  - use arj instead of non-free unarj (patch by Magnus Ekdahl)
  - use unzoo instead of non-free zoo (patch by Magnus Ekdahl)
  - removed thread support

freshclam:
  - mirror support (implemented by Damien Curtain <[email protected]>)
  - --proxy-user: proxy authorization support (implemented by Gernot Tenchio
    <[email protected]>)
  - new options --on-error-execute, --on-update-execute
    (ex. freshclam -d -c 6 --on-error-execute "sendsms 23332243 Can't
    update virus database"). Idea by Douglas J Hunley <[email protected]>

configure:
  - --disable-cr (don't link with C reentrant library (needed on some newer
    versions of OpenBSD))

- Enhanced AIX (thanks to Mike Loewen <[email protected]>) and
   Tru64 support (thanks to Christophe Varoqui <[email protected]>)

- documentation:
  - included how-to in Portugese by Alexandre de Jesus Marcolino
  - clamdoc.pdf and system manual updates

Many thanks to Luca 'NERvOus' Gibelli from ElektraPro for his support,
to Ken McKittrick from USA DataNet for a fully accessible FreeBSD box and
to mailing list subscribers for a constructive discussions.

--
Tomasz Kojm
June 21, 2003

## 0.54

Many major changes this time...

- libclamav:
  - fixed segfault with some strange zip archives (there is a bug in zziplib,
    libclamav contains a work around for it) (the problem was reported by
    Oliver Paukstadt <[email protected]>)
  - engine improvements (better support for a detection of new viruses,
    limited memory usage (consumes ~ 5 Mb now))
  - mbox code updated and moved into the library: fixed core dump when an
    embedded message includes a mime header with the line Content-Type:
    without specifying the type of content, fixed (theoretical) memory leak,
    support for multipart/report messages, fixed bug causing some formats to
    fail to scan) (Nigel)
- clamd:
  - new commands: CONTSCAN (it doesn't stop scanning even when virus is
    found), VERSION
  - disable logging of a unnecessary time stamps with LogTime when
    LogVerbose isn't used (patch by Ed Phillips <[email protected]>)
- freshclam:
  - "Cache-Control: no-cache" enabled by default
  - Cygwin support fix
- clamdscan:
  - initial version
- all tools:
  - removed huge printf() in help() (there was a buffer overflow problem with
    --help option under Windows and SCO Unix (reported by Wojciech Noworyta
    <[email protected]> and Nigel respectively)
- configure:
  - allow configuration of the clamav user and group with --with-user and
    --with-group (patch by Patrick Bihan-Faou <[email protected]>)
  - --enable-id-check - it uses the check procedure from Jason Englander
    <[email protected]>, currently it will fail on systems with getent
    which doesn't detect clamav group.
  - do not overwrite the existing config file

There are initial packages for Windows available at:
    http://clamav.elektrapro.com/binary

--tk

## 0.53

This release has removed the limit for a file name length in clamscan. Some
viruses (eg. W32/Yaha.E) are using very long file names, and they were
ignored in mbox mode. Users of AMaViS-ng and other wrappers were not
vulnerable to this problem, because that programs don't use original
attachement file names.

- clamscan:
  - removed limit for a file name length (thanks to Odhiambo Washington
    <[email protected]> for the test files and extensive mbox testing)
  - mbox: adapted to the new changes, enabled thread support (Nigel),
    re-enabled temporary directory removing.

## 0.52

This version contains a portability fixes - it should compile on OpenBSD,
MacOSX and NetBSD (support for them was broken in 0.51).

- clamd: various fixes:
  - drop supplementary groups (suggested by Enrico Scholz
    <[email protected]>) (this has been implemented
    in freshclam, too)
  - work-around for the segmentation fault at QUIT under FreeBSD
  - check timeouts when waiting for threads in RELOAD mode
  - SelfCheck - internal integrity check (by default every 1 hour)
  - fixed problem with directory scanning on non typical file systems
    (bug reported by Jason Englander <[email protected]>)
  - clamd is a system command (clamd.1 -> clamd.8, /usr/local/bin ->
    /usr/local/sbin) (Magnus Ekdahl)
- clamscan:
  - mbox code updates (Nigel Horne) - it fixes some problems on *BSD
    systems (see mailing lists archives for the details)
  - enable core dumping (Nigel Horne) [ with --enable-debug ]
- freshclam:
  - applied http-proxy patch from http://bugs.debian.org/clamav (by
    Martin Lesser <[email protected]>)
  - when configured with --disable-cache, freshclam forces 'no-cache'
    option in proxy servers (patch by Ant La Porte <[email protected]>)

- HPUX (10.20/11.0 tested) support (thanks to Joe Oaks <[email protected]>)
- fixed support for SCO Unix and BeOS (Nigel Horne)
- support/mboxscan: new version with SpamAssassin support (Nigel Horne)
- re-included TrashScan 0.08 (by Trashware <[email protected]>) - the security
  issue has been fixed.
- included "Installing qmail-scanner, Clam Antivirus and SpamAssassin under
  FreeBSD" how-to by Paul Hoadley and Eric Parsonage

## 0.51

OAV database is up to date ! There was a problem with signature parsing,
because some hex strings were upper case. Anyway, I still recommend you
freshclam for a database updating.

- support for the genuine OAV database
- limited memory usage (at the cost of speed, increase CL_MIN_LENGTH in
  libclamav/clamav.h to make it faster, it's safe to set it on 3-4 for
  the OAV database)
- fixed compile problem on TurboLinux 6.5 (probably others, too), the bug
  was reported by Henk Kuipers <[email protected]>.
- clamd: fixed THREXIT (thanks to Piotr Gackiewicz <[email protected]>)
- clamd: fixed serious bug with thread argument type
- clamscan: mbox: don't scan empty attachments (Nigel Horne)
- configure: --with-db1, --with-db2 (suggested by Magnus Ekdahl)

## 0.50

Here it is...
Clam AntiVirus 0.50 contains an anti-virus library - libclamav, a fully
multi-threaded daemon clamd(1) and a quite long list of changes. The
documentation was rewritten and you _should_ review it. By courtesy of
NERvOus <[email protected]> and ElektraPro, there are three mailing lists
available - you can subscribe via www at http://clamav.elektrapro.com/ml.
Please check the manual for more information.

New software:

- libclamav with RAR, Zip and Gzip support built-in. The library is thread
  safe and should be very secure, also. It uses UniquE RAR File
  Library by Christian Scheurer and Johannes Winkelmann (RAR 2.0 support only)
  and zziplib library by Guido Draheim and Tomi Ollila. Both of them are
  included and slightly modified in the clamav sources. You need the zlib
  library for the Zip/Gzip support, though. The API is described with
  examples in the clamdoc.

- clamd: a modern anti-virus daemon. It uses configuration file clamav.conf
  described in the clamav.conf(5) manual. The program was written with
  security as a goal.

- clamuko: on-access scanning under Linux. It utilizes Dazuko kernel module
  (GPL, http://dazuko.org) and is clamd-based.

New features / improvements:

- enhanced scanner engine (better detection of some complex polymorphic
  viruses)

- clamscan: Nigel Horne <[email protected]> has added the ability to scan
  mail attachments in a filter. For example:

  $ clamscan -i --mbox - < /var/spool/mail/john
  /tmp/aa6b9fc06bc477ae/setup.exe: Worm/Klez.H FOUND

  Nigel is the author of the whole mbox code in clamscan. Currently it only
  works in a filter mode, but there are plans to move the code into the
  libclamav and allow clamd using it. Please check support/mboxscan, also.

- clamscan: support for including and excluding multiple patterns with
  --include and --exclude (patch by Alejandro Dubrovsky
  <[email protected]>).
  Example: clamscan --include .exe --include .obj --include .scr /mnt/windows

- clamscan: don't scan /proc files (Linux, st_dev comparing). No more
  /proc/kcore related mails :))

- clamscan: use libclamav's archive support by default (it's enabled by default
  and may be disabled with --disable-archive) and switch to the external
  unpackers (if specified) in the case of libclamav archive code error.

- freshclam: proxy support (via $http_proxy variable and --http-proxy).
  I started implementing proxy support some time ago, but never finished.
  Nigel Horne did the great job and has finished the proxy support !

- freshclam: --daemon-notify. freshclam will send the RELOAD command to the
  daemon after database update (supports both tcp and local sockets, it reads
  clamav.conf to determine the socket type).

- freshclam: support for viruses.db2

Bug fixes:

- freshclam: log 'Database updated' message (thanks to Jeffrey Moskot
  <[email protected]> for the bug report). It now prints a number
  of signatures in a database, also.

- clamscan: fixed compile problem on Solaris 8 and some other systems -
  #include <signal.h> lack in others.c (thanks Mike Loewen
  <[email protected]> for the bug report)

Documentation:

- included Japanese documentation by Masaki Ogawa <[email protected]>

- updated Spanish "Sendmail + Amavis + ClamAv - Como" by Erick I. Lopez
   Carreon <[email protected]>

- rewritten clamdoc, included clamdoc-html, removed PostScript version (.ps)

- Clam-Mutant ;) logo update by Michal Hajduczenia <[email protected]>

- new man pages: clamd(1), clamav.conf(5); others updated

!!!
    Please don't use the oav-update script with this version. It doesn't
update viruses.db2 and supports OpenAntiVirus.org site only (the last
update of the OAV database was 1 July !). Nicholas Chua <[email protected]>
has generated over 200 new signatures, ClamAV's database is also frequently
updated (expecially when new wild virus/worm appears, eg. W32/BugBear.A).

    This software is still in developement (new software == new bugs), however
clamscan should be very stable. You shouldn't use clamd/clamuko (well, clamd is
stable, clamuko isn't) on production systems, yet. Please wait for 0.51 at
least ;). ClamAV 0.50 was tested on Linux and Solaris and should work fine.
There is a problem with clamd on FreeBSD (tested on my FreeBSD 5.0-CURRENT) -
the daemon crashes with Zip/Gzip files (disabling ScanArchive should help).

Enjoy !
--
Tomasz Kojm
October 5, 2002

## 0.24

- fixed threads deadlock in a critical error situation (bug found by David
  Sanchez <[email protected]>)
- fixed sigtool bug (negative seeking)
- fixed potential clamscan segfault in the case of memory allocation error
- unpacker execution error is no longer treated as critical - a few programs
  (eg. Qmail-Scanner, TrashScan) have clamscan command hardcoded with all
  archive options turned on. Now, if unpacker can't be executed, raw file is
  scanned and scan process is continued.
- reverted to pthread.h detection
- TrashScan 0.07 (Trashware <[email protected]>)
- --exclude (regular expressions are not supported !)
  [ex: clamscan --exclude="/proc/kcore" /], but please use it with care.
- included html documentation

IMPORTANT NOTE:
~~~~~~~~~~~~~~~
You will probably have a problem with a default Qmail-Scanner (1.13 or newer)
installation. You need to increase qmail-smtpd softlimit or disable it. You
can force clamscan to use only half of the memory which it uses by default, too.
Please change the following line in the clamscan/matcher.h file:
    #define MIN_LENGTH 5
to:
    #define MIN_LENGTH 3
and recompile the program. Unhappily, scanning may be a little slower in some
cases, but it shouldn't be significant. Then you can safely set the qmail
softlimit to 8 MB. I want to thank Doug Monroe <[email protected]> for
his contribution in the problem analysis.
---

New ClamAV version is in a heavy development. It has currently built-in
support for RAR, Zip, Gzip and tar. The daemon will support only built-in
compression/archive support. Snapshot will be available for a few days.

## 0.23

- fixed compile problem on FreeBSD (thanks to Wieslaw Glod <[email protected]> and
  Ken McKittrick <[email protected]>)
- clamscan reads all .db files from data directory, so you can put your
  own databases there and they won't be overwrited by the updaters. viruses.db
  is still the main database file (if --database isn't used).
- --deb (debian binary packages scanning) by Magnus Ekdahl <[email protected]>
- --remove option, but be careful with it !
- new clam logo ;) (GPL) by Michal Hajduczenia <[email protected]>.
- TrashScan 0.06 (by Trashware <[email protected]>) - a script for scanning
  mail with procmail. I recommend it. (support/trashscan)
- documentation updates

0.30 release will contain a daemon and an anti-virus library (with simple API),
so you can use it directly in your projects. I want to build in zip and rar
support, also.

There are binary packages for AIX available. Please check the documentation.

## 0.22

This release fixes bug with scanning archives in unaccessible directories with
*superuser* priviledges (after dropping priviledges scanner wasn't able to
access the archive, although the same archive was accessible), thanks
for Sergei Pronin <[email protected]> for the problem description. Now all
archives unaccessible directly by the clamav user are copied (with a respect to
--max-space) to the temporary directory. All old filesystem tricks were removed.

Other fixes / improvements:

- better error handling, new error codes
- improved -i (--infected) option
- removed --strange-unzip option
- removed eicar test files and logos from the documentation due to the GPL
  (thanks for Magnus Ekdahl <[email protected]>), ClamAV-Test-Signature is
  used instead
- removed Qmail-Scanner patch, ClamAV is supported by Q-S 1.13 (thanks guys!)
- code cleanups

## 0.21 Release

It fixes following problems:

- database downloading in freshclam/0.20
- malformed amavis-perl patch from 0.20
- clamscan problems with some unzip versions, please try --strange-unzip
  option

ClamAV 0.21 source package contains initial support for NetBSD
(thanks to Marc Baudoin <[email protected]>, Jean-Edouard BABIN
<[email protected]>), better support for Mac OS X (Masaki Ogawa <[email protected]>),
and clamdoc documentation corrected by Dennis Leeuw <[email protected]>.

## 0.20 Release

The most important change in this release is a new, linear pattern matching
algorithm. You will find more informations about it in clamscan/matcher.c -
in the sources and in clamdoc. Summary (since 0.15):

New features:

- fast pattern matching algorithm
- sigtool utility, check `man sigtool` and clamdoc
- Linux: threads autodetection on various architectures
  (Magnus Ekdahl <[email protected]>)
- -i, --infected: clamscan prints only infected files
- 'Data scanned' in summary, size in megabytes with 16 Kb precision
- configure: --with-dbdir sets the database location
- support/sigmake shell script by Dennis Leeuw <[email protected]>
- Spanish "Sendmail+Amavis+ClamAv installation how-to" by
  Erick I. Lopez Carreon <[email protected]>

Updates:

- "Debian GNU/Linux Mail Server v. 0.2.0" by Dennis Leeuw <[email protected]>
- qmail-scanner patch from Kazuhiko <[email protected]>
- general documentation cleanups / updates
- freshclam / Internet database location

Fixes:

- threads autodetection on not-x86 Linux systems
- gcc 3.x support (David Ford <[email protected]>)
- data type fix on Mac OS X (Peter N Lewis <[email protected]>)
- removed -w, --whole-file, now clamscan scans whole files by default
  -w is still supported by internal getopt(), because it is used in
  various patches
- removed --one-virus, still supported by getopt(); removed 'Found viruses'
  from summary, clamscan stops file scanning after first virus
- fixed old problem with scanning stdin
- removed amavisd-patch - strange problems have been reported

OpenAntiVirus Update is a great tool written by Matthew A. Grant
<[email protected]> and it will be the primary updater for ClamAV
in the near future. In contrast to freshclam it has proxy support and many
specific features. Please check clamdoc for more informations and how to
obtain it.

## 0.15 Notes

This version contains minor bugfixes only, such as:
- multiple fixes in freshclam (it has problems, when one of the
  hosts wasn't accessible), there were logic flaws in the code
- fixed problem with password protected archives (unpackers were waiting
  for password)

New features:
- OpenBSD support (thanks to Kamil Andrusz <[email protected]>)
- added support for amavisd, qmail-scanner (see ./support)

There were no major bugs and I was very busy, that's why new version is
released just today. In the next 2 months, clamav development will be much
faster. Here are some of my plans:

~ 0.20 : New pattern-matching algorithm
~ 0.30 : clamlib; clamscan and the daemon based on it

There is a new homepage:
- http://clamav.elektrapro.com

Thanks to ElektraPro.com for sponsoring this site (it's very fast).
Thanks to NERvOus <[email protected]>.

If you are interested in current development versions, please check
snapshots link.

### Resource usage limits in 0.14

Two new features: --max-files, --max-space have been implemented. If you have
enabled one of this options, clamscan monitors resource usage (number of
created files and used space) and stops extractor when it has exceeded
the limit. You should use these options to protect your machine against
Denial of Service attacks. In the near future --max-levels (limit for
recursive archives extracting) and --max-time (spent on checking/extracting
files) will be implemented.

### FreeBSD: AMaViS compile problems

Please check FAQ.

### !!! Strange signatures in VirusSignatures-2002.04.15.10.51.zip !!!

Last version of signatures was ~90 kb, this version is ~474 kb.
But I don't understand, why some signatures are mega-huge. When I decoded
them, they looked like regular files. In CA they were removed from the
database and I probably add them later, in normal sizes.

### Installation :

Please view documentation in ./docs. There are several formats - pdf, ps
and plain latex, if you want to compile it yourself.

You need GNU make (on Solaris you should have gmake).
It was tested only with gcc 2.9x compilers.