t1lib 5.1.2 and earlier, as used in Xpdf before 3.02pl6, teTeX, and other products, uses an invalid pointer in conjunction with a dereference operation, which allows remote attackers to execute arbitrary code via a crafted Type 1 font in a PDF document, as demonstrated by testz.2184122398.pdf.
http://rhn.redhat.com/errata/RHSA-2012-1201.html
http://secunia.com/advisories/43823
http://secunia.com/advisories/47347
http://secunia.com/advisories/48985
http://securityreason.com/securityalert/8171
http://securitytracker.com/id?1025266
https://exchange.xforce.ibmcloud.com/vulnerabilities/66208
https://security.gentoo.org/glsa/201701-57
http://www.kb.cert.org/vuls/id/376500
http://www.kb.cert.org/vuls/id/MAPG-8ECL8X
http://www.mandriva.com/security/advisories?name=MDVSA-2012:002
http://www.mandriva.com/security/advisories?name=MDVSA-2012:144