Secunia Security Advisory – Simon L. Nielsen has reported a vulnerability in portupgrade, which can be exploited by malicious, local users to perform certain actions on a vulnerable system with escalated privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/37136/sa14903.txt
Source: https://packetstormsecurity.com/files/37136/Secunia-Security-Advisory-14903.html