Ubuntu Security Notice USN-213-1 – Tavis Ormandy discovered a privilege escalation vulnerability in sudo. On executing shell scripts with sudo, the P4 and SHELLOPTS environment variables were not cleaned properly. If sudo is set up to grant limited sudo privileges to normal users this could be exploited to run arbitrary commands as the target user.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/41087/USN-213-1.txt
Source: https://packetstormsecurity.com/files/41087/Ubuntu-Security-Notice-213-1.html