The fbgs framebuffer Postscript/PDF viewer in fbi before 2.01 has a typo that prevents a filter from working correctly, which allows user-assisted attackers to bypass the filter and execute malicious Postscript commands.
https://exchange.xforce.ibmcloud.com/vulnerabilities/28038
http://www.vupen.com/english/advisories/2006/2982
http://www.securityfocus.com/bid/19131
http://www.novell.com/linux/security/advisories/2006_19_sr.html
http://www.debian.org/security/2006/dsa-1124
http://security.gentoo.org/glsa/glsa-200608-22.xml
http://secunia.com/advisories/21599
http://secunia.com/advisories/21459