[USN-4521-1] pam_tacplus vulnerability

Emilia Torino emilia.torino at canonical.com
Mon Sep 21 15:52:18 UTC 2020

Ubuntu Security Notice USN-4521-1
September 21, 2020

libpam-tacplus vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS


pam_tacplus could be made to expose sensitive information.

Software Description:
- libpam-tacplus: PAM module for using TACACS+ as an authentication service


It was discovered that pam_tacplus did not properly manage shared
secrets if DEBUG loglevel and journald are used. A remote attacker could
use this issue to expose sensitive information.

Update instructions:

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

Ubuntu 20.04 LTS:
  libpam-tacplus                  1.3.8-2+deb8u1build0.20.04.1

Ubuntu 18.04 LTS:
  libpam-tacplus                  1.3.8-2+deb8u1build0.18.04.1

Ubuntu 16.04 LTS:
  libpam-tacplus                  1.3.8-2+deb8u1build0.16.04.1

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


Package Information:




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