Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly perform a cast of an unspecified variable during use of the instanceof operator on a JavaScript object, which allows remote attackers to execute arbitrary code or cause a denial of service (assertion failure) via a crafted web site.
lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html
osvdb.org/86097
secunia.com/advisories/50856
secunia.com/advisories/50892
secunia.com/advisories/50904
secunia.com/advisories/50935
secunia.com/advisories/50984
www.mozilla.org/security/announce/2012/mfsa2012-80.html
www.ubuntu.com/usn/USN-1611-1
bugzilla.mozilla.org/show_bug.cgi?id=783867
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16814