Cryptographic Issues Affecting elliptic Open this link in a new tab package, versions <6.5.3
Exploit Maturity
Proof of concept
Attack Complexity
High
Confidentiality
High
Integrity
High
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snyk-id
SNYK-JS-ELLIPTIC-571484
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published
17 Jun 2020
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disclosed
5 Jun 2020
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credit
Unknown
Introduced: 5 Jun 2020
CVE-2020-13822 Open this link in a new tabHow to fix?
Upgrade elliptic
to version 6.5.3 or higher.
Overview
elliptic is a Fast elliptic-curve cryptography in a plain javascript implementation.
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")
}
}
}