The Cascading Style Sheets (CSS) implementation in Mozilla Firefox 4.x through 10.0, Firefox ESR 10.x before 10.0.3, Thunderbird 5.0 through 10.0, Thunderbird ESR 10.x before 10.0.3, and SeaMonkey before 2.8 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via dynamic modification of a keyframe followed by access to the cssText of the keyframe.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15066
https://bugzilla.mozilla.org/show_bug.cgi?id=723446
http://www.ubuntu.com/usn/USN-1400-5
http://www.ubuntu.com/usn/USN-1400-4
http://www.ubuntu.com/usn/USN-1400-3
http://www.ubuntu.com/usn/USN-1400-2
http://www.ubuntu.com/usn/USN-1400-1
http://www.securitytracker.com/id?1026804
http://www.securitytracker.com/id?1026803
http://www.securitytracker.com/id?1026801
http://www.mozilla.org/security/announce/2012/mfsa2012-17.html
http://www.mandriva.com/security/advisories?name=MDVSA-2012:032
http://secunia.com/advisories/49055
http://secunia.com/advisories/48629
http://secunia.com/advisories/48561
http://secunia.com/advisories/48553
http://secunia.com/advisories/48513
http://secunia.com/advisories/48496
http://secunia.com/advisories/48402
http://secunia.com/advisories/48359
http://rhn.redhat.com/errata/RHSA-2012-0388.html
http://rhn.redhat.com/errata/RHSA-2012-0387.html
http://lists.opensuse.org/opensuse-updates/2012-03/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2012-03/msg00014.html