1. Ubuntu Security Notices
  2. USN-5825-2

USN-5825-2: PAM regressions

Publication date

6 February 2023

Overview

USN-5825-1 caused some minor regressions in PAM.

Releases

Packages

  • pam - Pluggable Authentication Modules

Details

USN-5825-1 fixed vulnerabilities in PAM. Unfortunately that update was
incomplete and could introduce a regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that PAM did not correctly restrict login from an IP
address that is not resolvable via DNS. An attacker could possibly use this
issue to bypass authentication.

USN-5825-1 fixed vulnerabilities in PAM. Unfortunately that update was
incomplete and could introduce a regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that PAM did not correctly restrict login from an IP
address that is not resolvable via DNS. An attacker could possibly use this
issue to bypass authentication.

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
22.10 kinetic libpam-modules –  1.5.2-2ubuntu1.3
22.04 jammy libpam-modules –  1.4.0-11ubuntu2.3
20.04 focal libpam-modules –  1.3.1-5ubuntu4.6
18.04 bionic libpam-modules –  1.1.8-3.6ubuntu2.18.04.6
16.04 xenial libpam-modules –  1.1.8-3.2ubuntu2.3+esm4  
14.04 trusty libpam-modules –  1.1.8-1ubuntu2.2+esm3  

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References

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