CVE-2025-66271
📋 TL;DR
This vulnerability in ELECOM Clone for Windows allows local privilege escalation through an unquoted service path. Attackers with write access to the system drive root directory can execute arbitrary code with SYSTEM privileges. This affects users of ELECOM's Clone software on Windows systems.
💻 Affected Systems
- ELECOM Clone for Windows
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Full SYSTEM privilege compromise allowing complete control of the affected system, installation of persistent malware, credential theft, and lateral movement within the network.
Likely Case
Local privilege escalation from a standard user account to SYSTEM privileges, enabling installation of additional malware or backdoors on the compromised system.
If Mitigated
Limited impact if proper access controls prevent unauthorized users from writing to system drive root directories and if endpoint protection blocks suspicious service modifications.
🎯 Exploit Status
Exploitation requires local access and write permissions to system drive root directory. Standard unquoted service path exploitation techniques apply.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version with fix available per vendor advisory
Vendor Advisory: https://www.elecom.co.jp/news/security/20251209-01/
Restart Required: Yes
Instructions:
1. Download updated version from ELECOM website. 2. Uninstall current version. 3. Install updated version. 4. Restart system to ensure service updates take effect.
🔧 Temporary Workarounds
Apply proper service path quoting
windowsManually modify the service configuration to use quoted paths
sc config "ServiceName" binPath= "\"C:\Program Files\ELECOM\Clone\clone.exe\""
Restrict write permissions to system drive root
windowsRemove write permissions for standard users on system drive root directory
icacls C:\ /deny Users:(OI)(CI)W
🧯 If You Can't Patch
- Uninstall ELECOM Clone software if not required
- Implement strict access controls to prevent unauthorized users from writing to system drive root directories
🔍 How to Verify
Check if Vulnerable:
Check if ELECOM Clone service exists with unquoted path: sc qc "ELECOM Clone Service" | findstr BINARY_PATH_NAMECheck Version:
Check program version in Control Panel > Programs and Features or via software interfaceVerify Fix Applied:
Verify service path is quoted and check installed version matches patched version📡 Detection & Monitoring
Log Indicators:
- Windows Event Logs showing service path modifications
- Security logs showing privilege escalation attempts
- Application logs showing unexpected service restarts
Network Indicators:
- Unusual outbound connections from system processes
- Lateral movement attempts from affected systems
SIEM Query:
EventID=7045 AND ServiceName="ELECOM Clone Service" OR ProcessCreation WHERE ImagePath contains "ELECOM" AND ParentImage contains "services.exe"