Microsoft Edge Chakra JIT - Stack-to-Heap Copy (Incomplete Fix) (1)

/ Here's a snippet of JavascriptArray::BoxStackInstance. To fix issue 1420 , "deepCopy" was introduced. But it only deep-copies the array when "instance-head" is on the stack. So simply by adding a single line of code that allocates "head" to the heap, we can bypass the fix. template T...

Microsoft Edge Chakra JIT - Stack-to-Heap Copy (Incomplete Fix) Exploit

Exploit for windows platform in category dos / poc / Here's a snippet of JavascriptArray::BoxStackInstance. To fix issue 1420 , "deepCopy" was introduced. But it only deep-copies the array when "instance-head" is on the stack. So simply by adding a single line of code that allocates "head" to the...

Microsoft Edge Chakra JIT - Stack-to-Heap Copy (Incomplete Fix) (2)

/ Here's a snippet of JavascriptArray::BoxStackInstance. template T JavascriptArray::BoxStackInstanceT instance, bool deepCopy AssertThreadContext::IsOnStackinstance; // On the stack, the we reserved a pointer before the object as to store the boxed value T boxedInstanceRef = T instance - 1; T...

Microsoft Edge Chakra JIT Stack-To-Heap Copy Bug

Microsoft Edge: Chakra: JIT: stack-to-heap copy bug CVE-2018-0776 If variables don't escape the scope, the variables can be allocated to the stack. However, there are some situations, such as when a bailout happens or accessing to arguments containing stack-allocated variables, where those...

Microsoft Edge Chakra JIT - Stack-to-Heap Copy

/ If variables don't escape the scope, the variables can be allocated to the stack. However, there are some situations, such as when a bailout happens or accessing to arguments containing stack-allocated variables, where those variables should not exist in the stack. In these cases, the...