First of all, CVE-2014-1580 (MSFA 2014-78) is a bug that caused Firefox prior to version 33 (released today) to leak bits of uninitialized memory when rendering certain types of truncated images onto <canvas>. Mozilla's advisory is here: https://www.mozilla.org/security/announce/2014/mfsa2014-78.html Bug is here: https://bugzilla.mozilla.org/show_bug.cgi?id=1063733 PoC is here: http://lcamtuf.coredump.cx/ffgif2/ Secondly, MSRC case #19611cz is a seemingly similar issue with Internet Explorer apparently using bits of uninitialized stack data when handling JPEG files with an oddball DHT. You should be able to reproduce with: http://lcamtuf.coredump.cx/iepuzzle/canvas.html This one doesn't have a fix yet; I decided to disclose it because it is easily hit with an existing open-source fuzzer, and because we went past the 90-day mark without making any evident progress on the report. The timeline is captured here: http://lcamtuf.blogspot.com/2014/10/two-more-browser-memory-disclosure-bugs.html Obligatory plug - both of these have been found with: http://code.google.com/p/american-fuzzy-lop/
