Secunia Security Advisory – Gentoo has acknowledged a security issue in portage, 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/70800/sa32228.txt
Source: https://packetstormsecurity.com/files/70800/Secunia-Security-Advisory-32228.html