CVE-2012-0447
Mozilla Firefox 4.x through 9.0, Thunderbird 5.0 through 9.0, and SeaMonkey before 2.7 do not properly initialize data for image/vnd.microsoft.icon images, which allows remote attackers to obtain potentially sensitive information by reading a PNG image that was created through conversion from an ICO image.
Date published : 2012-02-01
http://www.mozilla.org/security/announce/2012/mfsa2012-06.html