CVE-2023-31239
📋 TL;DR
A stack-based buffer overflow vulnerability in Fuji Electric V-Server and V-Server Lite SCADA software allows remote code execution when a user opens a malicious VPR file. This affects V-Server v4.0.15.0 and earlier, and V-Server Lite v4.0.15.0 and earlier. Attackers can exploit this to gain control of affected systems.
💻 Affected Systems
- V-Server
- V-Server Lite
📦 What is this software?
V Server by Fujielectric
V Server by Fujielectric
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control, potentially leading to industrial process disruption, data theft, or ransomware deployment.
Likely Case
Local privilege escalation leading to unauthorized access to SCADA systems and potential manipulation of industrial processes.
If Mitigated
Limited impact if proper network segmentation and user awareness training prevent malicious VPR file execution.
🎯 Exploit Status
Exploitation requires user to open malicious file. No authentication bypass needed if user can be tricked into opening file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.0.16.0 or later
Vendor Advisory: https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php
Restart Required: Yes
Instructions:
1. Download updated version from Fuji Electric website. 2. Backup configuration files. 3. Uninstall current version. 4. Install updated version. 5. Restore configuration files. 6. Restart system.
🔧 Temporary Workarounds
Restrict VPR file execution
windowsBlock execution of VPR files from untrusted sources using application whitelisting or file extension blocking.
User awareness training
allTrain users to never open VPR files from unknown or untrusted sources.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate V-Server systems from untrusted networks.
- Deploy application control solutions to prevent execution of unauthorized VPR files.
🔍 How to Verify
Check if Vulnerable:
Check V-Server version in Help > About menu. If version is 4.0.15.0 or earlier, system is vulnerable.Check Version:
Check Help > About menu in V-Server application GUIVerify Fix Applied:
Verify version is 4.0.16.0 or later in Help > About menu after patching.📡 Detection & Monitoring
Log Indicators:
- Unexpected VPR file access events
- Process creation from V-Server with unusual parameters
- Memory access violations in application logs
Network Indicators:
- Unusual outbound connections from V-Server systems
- File transfers to V-Server systems containing VPR files
SIEM Query:
source="V-Server" AND (event_type="file_access" AND file_extension="vpr") OR (process_name="V-Server.exe" AND memory_violation="true")