Secunia Security Advisory – Ilja van Sprundel reported a vulnerability in the passwd application of shadow, which potentially can be exploited by malicious, local users to perform certain actions with escalated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48010/sa20950.txt
Source: https://packetstormsecurity.com/files/48010/Secunia-Security-Advisory-20950.html