gfax 0.4.2 and probably other versions creates temporary files insecurely, which allows local users to execute arbitrary commands via unknown vectors.
https://exchange.xforce.ibmcloud.com/vulnerabilities/35403
http://www.securitytracker.com/id?1018335
http://www.securityfocus.com/bid/24780
http://www.debian.org/security/2007/dsa-1329
http://secunia.com/advisories/25967