a2ps 4.13 allows remote attackers to execute arbitrary commands via shell metacharacters in the filename.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17127
http://www.securityfocus.com/archive/1/419765/100/0/threaded
http://www.securiteam.com/unixfocus/5MP0N2KDPA.html
http://www.novell.com/linux/security/advisories/2004_34_xfree86_libs_xshared.html
http://www.mandriva.com/security/advisories?name=MDKSA-2004:140
http://sunsolve.sun.com/search/document.do?assetkey=1-26-57649-1&searchclause=
http://secunia.com/advisories/12375