seeing is believing

Microsoft Edge FillFromPrototypes Type Confusion

Microsoft Edge FillFromPrototypes Type Confusion
Posted Nov 18, 2016
Authored by Google Security Research, natashenka

JavascriptArray::FillFromPrototypes is a method that is used by several Javascript functions available in the browser to set the native elements of an array to the values provide by its prototype. This function calls JavascriptArray::ForEachOwnMissingArrayIndexOfObject with the prototype of the object as a parameter, and if the prototype of the object is an array, it assumes that it is a Var array. While arrays are generally converted to var arrays if they are set as an object's prototype, if an object's prototype is a Proxy object, it can return a parent prototype that is a native int array. This can lead to type confusing, allowing an integer to be treated as an absolute pointer, when JavascriptArray::FillFromPrototypes is called.

tags | exploit, javascript
advisories | CVE-2016-7201
MD5 | b19c83ae2ea66b65599361a571b8fa62

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