Ubuntu Update for policykit-1 USN-1953-1

Solution
Please Install the Updated Packages.
Insight
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.
Affected
policykit-1 on Ubuntu 13.04 , Ubuntu 12.10 , Ubuntu 12.04 LTS , Ubuntu 10.04 LTS
References