USN-4314-1: pam-krb5 vulnerability

31 March 2020

libpam-krb5 vulnerability

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

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM

Summary

pam-krb5 could be made to execute arbitrary code if it received a specially crafted response.

Software Description

  • libpam-krb5 - PAM module for MIT Kerberos

Details

Russ Allbery discovered that pam-krb5 incorrectly handled some responses. An attacker could possibly use this issue to execute arbitrary code.

Update instructions

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

Ubuntu 19.10
libpam-krb5 - 4.8-2ubuntu0.1
Ubuntu 18.04 LTS
libpam-krb5 - 4.8-1ubuntu0.1
Ubuntu 16.04 LTS
libpam-krb5 - 4.7-2ubuntu0.1
Ubuntu 14.04 ESM
libpam-krb5 - 4.6-2ubuntu0.1~esm1
Ubuntu 12.04 ESM
libpam-krb5 - 4.5-3ubuntu0.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References