img.pl in Barracuda Spam Firewall running firmware 3.1.16 and 3.1.17 allows remote attackers to execute arbitrary commands via shell metacharacters in the f parameter.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-2848
http://www.securiweb.net/wiki/Ressources/AvisDeSecurite/2005.1
http://www.securitytracker.com/alerts/2005/Sep/1014837.html
http://www.securityfocus.com/bid/14712