Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement the HTML5 Same Origin Policy, which allows remote attackers to conduct cross-site scripting (XSS) attacks by leveraging initial-origin access after document.domain has been set.

References

• https://nvd.nist.gov/vuln/detail/CVE-2012-3985
• https://bugzilla.mozilla.org/show_bug.cgi?id=655649
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16108
• http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html
• http://osvdb.org/86106
• http://secunia.com/advisories/50856
• http://secunia.com/advisories/50892
• http://secunia.com/advisories/50904
• http://secunia.com/advisories/50935
• http://secunia.com/advisories/50984
• http://www.mozilla.org/security/announce/2012/mfsa2012-76.html
• http://www.ubuntu.com/usn/USN-1611-1