The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbird before 16.0, Thunderbird ESR 10.x before 10.0.8, and SeaMonkey before 2.13 does not prevent access to properties of a prototype for a standard class, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted web site.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16946
https://exchange.xforce.ibmcloud.com/vulnerabilities/79154
https://bugzilla.mozilla.org/show_bug.cgi?id=780370
http://www.ubuntu.com/usn/USN-1611-1
http://www.securityfocus.com/bid/56120
http://www.mozilla.org/security/announce/2012/mfsa2012-83.html
http://www.mandriva.com/security/advisories?name=MDVSA-2012:163
http://secunia.com/advisories/55318
http://secunia.com/advisories/50984
http://secunia.com/advisories/50904
http://secunia.com/advisories/50892
http://rhn.redhat.com/errata/RHSA-2012-1351.html
http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html