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Ubuntu Security Notice USN-6588-2
March 26, 2024
pam vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)
Summary:
PAM could be made to stop responding if it opened a specially crafted file.
Software Description:
- pam: Pluggable Authentication Modules
Details:
USN-6588-1 fixed a vulnerability in PAM. This update
provides the corresponding updates for Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, and Ubuntu 18.04 LTS.
Original advisory 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libpam-modules                  1.1.8-3.6ubuntu2.18.04.6+esm1
Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   libpam-modules                  1.1.8-3.2ubuntu2.3+esm5
Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   libpam-modules                  1.1.8-1ubuntu2.2+esm4
In general, a standard system update will make all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6588-2
   https://ubuntu.com/security/notices/USN-6588-1
   CVE-2024-22365