Ubuntu Security Notice USN-1953-1
18th September, 2013
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.
- 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.
The problem can be corrected by updating your system to the following package version:
- 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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.