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Full authentication bypass if SASL authorization username is specified

Critical
foxcpp published GHSA-4g76-w3xw-2x6w Mar 13, 2023

Package

gomod github.com/foxcpp/maddy (Go)

Affected versions

<=0.6.2,>=0.2.0

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

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

CVE ID

CVE-2023-27582

Weaknesses