Secunia Security Advisory – Gentoo has issued an update for gdm. This fixes a vulnerability, which can be exploited by malicious, local users to bypass certain security restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/47321/sa20636.txt
Source: https://packetstormsecurity.com/files/47321/Secunia-Security-Advisory-20636.html