USN-5825-2: PAM regressions

Releases

• Ubuntu 22.10
• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

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.

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

• libpam-modules - 1.4.0-11ubuntu2.3

Ubuntu 20.04

• libpam-modules - 1.3.1-5ubuntu4.6

Ubuntu 18.04

• libpam-modules - 1.1.8-3.6ubuntu2.18.04.6

Ubuntu 16.04

• libpam-modules - 1.1.8-3.2ubuntu2.3+esm4
  Available with Ubuntu Pro

Ubuntu 14.04

• libpam-modules - 1.1.8-1ubuntu2.2+esm3
  Available with Ubuntu Pro

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

References

• CVE-2022-28321
• https://launchpad.net/bugs/2006073

Related notices

• USN-5825-1: libpam-modules-bin, libpam-runtime, pam, libpam0g-dev, libpam0g, libpam-cracklib, libpam-doc, libpam-modules