The ActionScript parameter conversion in the fix for  issue 403  (https://code.google.com/p/google-security-research/issues/detail?id=403) can sometimes access a parameter on the native stack that is uninitialized.

If:

mc.swapDepths();

is called in ActionScript, a parameter array is allocated using alloca(0), which leads to a 16-byte (the minimum size length for alloca in the implementation) that does not get initialized. The conversion function in the UaF check then assumes that at least one parameter has been allocated, and attempts to convert the stack parameter to a string, even though it is a previous value (a UTF string "fffff ... " in the PoC).

A PoC is attached, it is a bit finicky and depends a lot on the specific Flash version. It crashes currently in chrome-unstable, by loading crasher2.swf?num=15, and then immediately loading crasher2.swf?num=4. The num parameter shifts the stack (for nums between 0 and 31), so changing it around should lead to crashes in different browsers.


This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.