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In Bouncy Castle JCE Provider it is possible to inject extra elements in the sequence making up the signature and still have it validate

High severity GitHub Reviewed Published Oct 17, 2018 to the GitHub Advisory Database • Updated May 24, 2024

Package

maven org.bouncycastle:bcprov-jdk14 (Maven)

Affected versions

>= 1.38, < 1.56

Patched versions

1.56
maven org.bouncycastle:bcprov-jdk15 (Maven)
>= 1.38, < 1.56
1.56

Description

In Bouncy Castle JCE Provider version 1.55 and earlier the DSA does not fully validate ASN.1 encoding of signature on verification. It is possible to inject extra elements in the sequence making up the signature and still have it validate, which in some cases may allow the introduction of 'invisible' data into a signed structure.

References

Published by the National Vulnerability Database Jun 1, 2018
Published to the GitHub Advisory Database Oct 17, 2018
Reviewed Jun 16, 2020
Last updated May 24, 2024

Severity

High
7.5
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weaknesses

CVE ID

CVE-2016-1000338

GHSA ID

GHSA-4vhj-98r6-424h

Source code

Credits

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