USN-6588-1: PAM vulnerability

Publication date

17 January 2024

Overview

PAM could be made to stop responding if it opened a specially crafted file.


Packages

  • pam - Pluggable Authentication Modules

Details

Matthias Gerstner discovered that the PAM pam_namespace module incorrectly
handled special files when performing directory checks. A local attacker
could possibly use this issue to cause PAM to stop responding, resulting in
a denial of service.

Matthias Gerstner discovered that the PAM pam_namespace module incorrectly
handled special files when performing directory checks. A local attacker
could possibly use this issue to cause PAM to stop responding, resulting in
a denial of service.

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
23.10 mantic libpam-modules –  1.5.2-6ubuntu1.1
23.04 lunar libpam-modules –  1.5.2-5ubuntu1.1
22.04 jammy libpam-modules –  1.4.0-11ubuntu2.4
20.04 focal libpam-modules –  1.3.1-5ubuntu4.7

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