USN-1953-1: polkit vulnerability

18 September 2013

policykit-1 vulnerability

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

  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS


polkit could be tricked into giving out improper authorization.

Software Description

  • policykit-1 - framework for managing administrative policies and privileges


It was discovered that polkit didn’t allow applications to use the pkcheck tool in a way which prevented a race condition in the UID lookup. A local attacker could use this flaw to possibly escalate privileges.

Update instructions

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

Ubuntu 13.04
policykit-1 - 0.105-1ubuntu1.1
Ubuntu 12.10
policykit-1 - 0.104-2ubuntu1.1
Ubuntu 12.04 LTS
policykit-1 - 0.104-1ubuntu1.1
Ubuntu 10.04 LTS
policykit-1 - 0.96-2ubuntu0.2

To update your system, please follow these instructions:

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