Secunia Security Advisory – Ubuntu has issued an update for ppp. This fixes a vulnerability, 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/48020/sa20967.txt
Source: https://packetstormsecurity.com/files/48020/Secunia-Security-Advisory-20967.html