The getUserMedia permission implementation in Mozilla Firefox before 22.0 references the URL of a top-level document instead of the URL of a specific page, which makes it easier for remote attackers to trick users into permitting camera or microphone access via a crafted web site that uses IFRAME elements.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16791
https://bugzilla.mozilla.org/show_bug.cgi?id=876044
http://www.ubuntu.com/usn/USN-1890-1
http://www.mozilla.org/security/announce/2013/mfsa2013-60.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00005.html