cups-browsed in cups-filters 1.0.41 before 1.0.51 allows remote IPP printers to execute arbitrary commands via shell metacharacters in the (1) model or (2) PDL, related to "System V interface scripts generated for queues."
https://bugzilla.redhat.com/show_bug.cgi?id=1083326
http://www.ubuntu.com/usn/USN-2210-1
http://secunia.com/advisories/57530
http://seclists.org/oss-sec/2014/q2/13
http://lists.fedoraproject.org/pipermail/package-announce/2014-April/131485.html
http://bzr.linuxfoundation.org/loggerhead/openprinting/cups-filters/revision/7188#NEWS