Secunia Security Advisory – Ubuntu has issued an update for xorg-server. This fixes a security issue and a vulnerability, which can be exploited by malicious, local users to bypass certain security restrictions and by malicious people to potentially compromise a user’s system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/89708/sa39834.txt
Source: https://packetstormsecurity.com/files/89708/Secunia-Security-Advisory-39834.html