Skip to content

Full authentication bypass if SASL authorization username is specified

Critical severity GitHub Reviewed Published Mar 13, 2023 in foxcpp/maddy • Updated Mar 14, 2023

Package

gomod github.com/foxcpp/maddy (Go)

Affected versions

>= 0.2.0, < 0.6.3

Patched versions

0.6.3

Description

Impact

maddy 0.2.0 - 0.6.2 allows a full authentication bypass if SASL authorization username is specified when using the PLAIN authentication mechanisms. Instead of validating the specified authorization username, it is accepted as is after checking the credentials for the authentication username.

Patches

maddy 0.6.3 includes the fix for the bug.

Workarounds

There is no way to fix the issue without upgrading.

References

References

@foxcpp foxcpp published to foxcpp/maddy Mar 13, 2023
Published by the National Vulnerability Database Mar 13, 2023
Published to the GitHub Advisory Database Mar 14, 2023
Reviewed Mar 14, 2023
Last updated Mar 14, 2023

Severity

Critical
9.1
/ 10

CVSS base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CVE ID

CVE-2023-27582

GHSA ID

GHSA-4g76-w3xw-2x6w

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.