CVE-2026-28388 OpenSSL 拒绝服务漏洞

# This is a conceptual PoC to demonstrate the creation of a malformed Delta CRL. # In a real scenario, this would require crafting specific ASN.1 structures. import sys def create_malformed_delta_crl(): """ Simulates the creation of a CRL with Delta CRL Indicator extension but missing the CRL Number extension. """ # Note: Actual exploitation requires constructing a valid ASN.1 CRL structure # with specific extensions present and absent. # This script represents the logic flow. print("[*] Generating malformed Delta CRL structure...") # 1. Create a base CRL structure (simplified) crl_data = {} # 2. Add Delta CRL Indicator extension (Required for the vulnerability path) crl_data['extensions'] = { 'DeltaCRLIndicator': True, # This extension is present 'CRLNumber': None # This extension is MISSING (NULL) } # 3. Serialize and send to target malicious_payload = crl_data return malicious_payload if __name__ == "__main__": payload = create_malformed_delta_crl() print(f"[!] Malformed payload prepared: {payload}") print("[!] Send this to an application processing CRLs with X509_V_FLAG_USE_DELTAS enabled.")