Mozilla Firefox before 3.6.26 and 4.x through 6.0, Thunderbird before 3.1.18 and 5.0 through 6.0, and SeaMonkey before 2.4 do not properly enforce the IPv6 literal address syntax, which allows remote attackers to obtain sensitive information by making XMLHttpRequest calls through a proxy and reading the error messages.
lists.opensuse.org/opensuse-security-announce/2012-02/msg00003.html
lists.opensuse.org/opensuse-security-announce/2012-02/msg00007.html
lists.opensuse.org/opensuse-security-announce/2012-02/msg00011.html
www.debian.org/security/2012/dsa-2400
www.debian.org/security/2012/dsa-2402
www.debian.org/security/2012/dsa-2406
www.mandriva.com/security/advisories?name=MDVSA-2012:013
www.mozilla.org/security/announce/2012/mfsa2012-02.html
bugzilla.mozilla.org/show_bug.cgi?id=504014
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14814