Ubuntu 22.10 USN-5825-2: Critical PAM Authentication Fix

ubuntu

February 6, 2023

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

Summary

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

Software Description:

- 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.

Topics Covered

security advisory security issue authentication fix pam regression ubuntu 22.10

Update Instructions

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

Ubuntu 22.10:
  libpam-modules                  1.5.2-2ubuntu1.3

Ubuntu 22.04 LTS:
  libpam-modules                  1.4.0-11ubuntu2.3

Ubuntu 20.04 LTS:
  libpam-modules                  1.3.1-5ubuntu4.6

Ubuntu 18.04 LTS:
  libpam-modules                  1.1.8-3.6ubuntu2.18.04.6

Ubuntu 16.04 ESM:
  libpam-modules                  1.1.8-3.2ubuntu2.3+esm4

Ubuntu 14.04 ESM:
  libpam-modules                  1.1.8-1ubuntu2.2+esm3

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