Mozilla Firefox before 21.0, Firefox ESR 17.x before 17.0.6, Thunderbird before 17.0.6, and Thunderbird ESR 17.x before 17.0.6 do not properly initialize data structures for the nsDOMSVGZoomEvent::mPreviousScale and nsDOMSVGZoomEvent::mNewScale functions, which allows remote attackers to obtain sensitive information from process memory via a crafted web site.
http://www.ubuntu.com/usn/USN-1823-1
http://www.ubuntu.com/usn/USN-1822-1
http://www.mozilla.org/security/announce/2013/mfsa2013-47.html
http://www.debian.org/security/2013/dsa-2699
http://rhn.redhat.com/errata/RHSA-2013-0821.html
http://rhn.redhat.com/errata/RHSA-2013-0820.html
http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00008.html
http://lists.opensuse.org/opensuse-security-announce/2013-06/msg00006.html
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2013-05/msg00010.html