Secunia Security Advisory – A vulnerability exists in GNU a2ps 4.x that allows local users to escalate privileges due to insufficient validation of shell escape characters in filenames.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/34181/sa12375.txt
Source: https://packetstormsecurity.com/files/34181/Secunia-Security-Advisory-12375.html