Yello, The recent release of Firefox 32 fixes another interesting image parsing issue found by afl [1]: following a refactoring of memory management code, the past few versions of the browser ended up using uninitialized memory for certain types of truncated images, which is easily measurable with a simple <canvas> + toDataURL() harness that examines all the fuzzer-generated test cases.
Depending on a variety of factors, problems like that may leak secrets across web origins, or more prosaically, may help attackers bypass security measures such as ASLR. Here's a short proof-of-concept that should work if you haven't updated to 32 yet: http://lcamtuf.coredump.cx/ffgif/ This is tracked as CVE-2014-1564, Mozilla bug 1045977, MFSA 2014-69. [1] http://code.google.com/p/american-fuzzy-lop/ PS. Mildly interesting: http://www.chromium.org/Home/chromium-security/client-identification-mechanisms _______________________________________________ Sent through the Full Disclosure mailing list http://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
