Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderbird ESR 10.x before 10.0.12 and 17.x before 17.0.2, and SeaMonkey before 2.15 allow remote attackers to spoof the address bar via vectors involving authentication information in the userinfo field of a URL, in conjunction with a 204 (aka No Content) HTTP status code.
lists.opensuse.org/opensuse-security-announce/2013-01/msg00006.html
lists.opensuse.org/opensuse-security-announce/2013-01/msg00007.html
lists.opensuse.org/opensuse-security-announce/2013-01/msg00010.html
lists.opensuse.org/opensuse-security-announce/2013-01/msg00017.html
rhn.redhat.com/errata/RHSA-2013-0144.html
rhn.redhat.com/errata/RHSA-2013-0145.html
www.mozilla.org/security/announce/2013/mfsa2013-04.html
www.ubuntu.com/usn/USN-1681-1
www.ubuntu.com/usn/USN-1681-2
www.ubuntu.com/usn/USN-1681-4
bugzilla.mozilla.org/show_bug.cgi?id=802026
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16827