Cryptographic Issues Affecting elliptic package, versions <6.5.3
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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Start learning- Snyk IDSNYK-JS-ELLIPTIC-571484
- published17 Jun 2020
- disclosed5 Jun 2020
- creditUnknown
Introduced: 5 Jun 2020
CVE-2020-13822 (opens in a new tab)How to fix?
Upgrade elliptic to version 6.5.3 or higher.
Overview
elliptic is a fast elliptic-curve cryptography implementation in plain javascript.
Affected versions of this package are vulnerable to Cryptographic Issues. Elliptic allows ECDSA signature malleability via variations in encoding, leading \0 bytes, or integer overflows. This could conceivably have a security-relevant impact if an application relied on a single canonical signature.
PoC
var crypto = require('crypto') var EC = require('elliptic').ec; var ec = new EC('secp256k1');var obj = require("./poc_ecdsa_secp256k1_sha256_test.json");
for (let testGroup of obj.testGroups) {
var key = ec.keyFromPublic(testGroup.key.uncompressed, 'hex'); for(let test of testGroup.tests) { console.log("[*] Test " + test.tcId + " result: " + test.result) msgHash = crypto.createHash('sha256').update(Buffer.from(test.msg, 'hex')).digest(); try { result = key.verify(msgHash, Buffer.from(test.sig, 'hex')); if (result == true) { if (test.result == "valid" || test.result == "acceptable") console.log("Result: PASS"); else console.log("Result: FAIL") } if (result == false) { if (test.result == "valid" || test.result == "acceptable") console.log("Result: FAIL"); else console.log("Result: PASS") } } catch (e) { console.log("ERROR - VERIFY: " + e) if (test.result == "valid" || test.result == "acceptable") console.log("Result: FAIL"); else console.log("Result: PASS") } }
}