MEDIUM
Mozilla Firefox before 22.0 does not properly implement certain DocShell inheritance behavior for the sandbox attribute of an IFRAME element, which allows remote attackers to bypass intended access restrictions via a FRAME element within an IFRAME element.
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00003.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00005.html
http://www.mozilla.org/security/announce/2013/mfsa2013-57.html
http://www.ubuntu.com/usn/USN-1890-1
https://bugzilla.mozilla.org/show_bug.cgi?id=849791
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16433