Secunia Security Advisory – Debian has issued an update for xfree86. This fixes a vulnerability, which potentially can be exploited by malicious, local users to gain escalated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/40189/sa16905.txt
Source: https://packetstormsecurity.com/files/40189/Secunia-Security-Advisory-16905.html