Secunia Security Advisory – Debian has issued an update for xfree86. This fixes some vulnerabilities, which 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/53703/sa23789.txt
Source: https://packetstormsecurity.com/files/53703/Secunia-Security-Advisory-23789.html