CVE-2025-66269
📋 TL;DR
This vulnerability allows local attackers with write permissions to directories preceding the UPSilon 2000 service executables to perform path interception and escalate privileges to SYSTEM level. It affects systems running RupsMon and USBMate services from UPSilon 2000 software. Attackers need local access to exploit this unquoted service path vulnerability.
💻 Affected Systems
- UPSilon 2000 software with RupsMon service
- UPSilon 2000 software with USBMate service
⚠️ 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 escalation leading to complete system compromise, data theft, persistence establishment, and lateral movement capabilities.
Likely Case
Local privilege escalation allowing attackers to bypass security controls, install malware, or access sensitive system resources.
If Mitigated
Limited impact if proper directory permissions are enforced and least privilege principles are followed.
🎯 Exploit Status
Exploitation requires local access and write permissions to directories in the service path. Standard unquoted service path exploitation techniques apply.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.megatec.com.tw/software-download/
Restart Required: Yes
Instructions:
1. Check vendor website for updated software. 2. If patch available, download and install. 3. Restart affected services or system. 4. Verify service paths are properly quoted.
🔧 Temporary Workarounds
Quote Service Paths
windowsModify service configurations to use quoted paths for executables
sc config "RupsMon" binPath= "\"C:\Program Files\UPSilon2000\RupsMon.exe\""
sc config "USBMate" binPath= "\"C:\Program Files\UPSilon2000\USBMate.exe\""
Restrict Directory Permissions
windowsRemove write permissions from directories preceding service executables
icacls "C:\Program Files" /deny "Users:(OI)(CI)W"
icacls "C:\Program Files\UPSilon2000" /deny "Users:(OI)(CI)W"
🧯 If You Can't Patch
- Run services with least privilege accounts instead of SYSTEM
- Implement strict directory permission controls and audit regularly
🔍 How to Verify
Check if Vulnerable:
Check service configurations: sc qc RupsMon and sc qc USBMate - look for unquoted paths with spaces and check permissions on preceding directoriesCheck Version:
Check software version in Control Panel > Programs or vendor documentationVerify Fix Applied:
Verify service paths are quoted and preceding directories have restricted write permissions📡 Detection & Monitoring
Log Indicators:
- Service path modifications in Windows Event Logs (Event ID 7040)
- Unauthorized privilege escalation attempts
- Unexpected service restarts
Network Indicators:
- None - local exploitation only
SIEM Query:
EventID=7040 AND (ServiceName="RupsMon" OR ServiceName="USBMate")