CVE-2023-47584
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in V-Server and V-Server Lite software versions up to 4.0.18.0. Attackers can exploit this by tricking users into opening malicious VPR files, potentially leading to information disclosure or remote code execution. Organizations using these affected versions for industrial control or monitoring systems are at risk.
💻 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
Full system compromise with attacker gaining complete control over the affected system, potentially leading to data theft, system manipulation, or lateral movement within industrial networks.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive industrial control data or disruption of monitoring operations.
If Mitigated
Limited impact with proper network segmentation and user awareness preventing malicious file execution.
🎯 Exploit Status
Exploitation requires user interaction to open malicious VPR file. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V4.0.19.0 or later
Vendor Advisory: https://hakko-elec.co.jp/site/download/03tellus_inf/index.php
Restart Required: Yes
Instructions:
1. Download latest version from vendor website. 2. Backup configuration files. 3. Uninstall current version. 4. Install updated version. 5. Restore configuration. 6. Restart system.
🔧 Temporary Workarounds
Restrict VPR file execution
windowsBlock execution of VPR files from untrusted sources using application control policies.
Using Windows AppLocker or similar: New-AppLockerPolicy -RuleType Path -Action Deny -Path "*.vpr" -User Everyone
User awareness training
allTrain users to avoid opening VPR files from unknown or untrusted sources.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate V-Server systems from critical networks
- Deploy application whitelisting to prevent execution of unauthorized files
🔍 How to Verify
Check if Vulnerable:
Check Help > About in V-Server application. If version is 4.0.18.0 or earlier, system is vulnerable.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is 4.0.19.0 or later in Help > About menu.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from V-Server executable
- Multiple failed VPR file parsing attempts
- Unexpected network connections from V-Server process
Network Indicators:
- Outbound connections from V-Server to unexpected destinations
- File transfers involving VPR files from untrusted sources
SIEM Query:
Process Creation where Image contains "v-server" AND CommandLine contains ".vpr"🔗 References
- https://hakko-elec.co.jp/site/download/03tellus_inf/index.php
- https://jvn.jp/en/vu/JVNVU93840158/
- https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php
- https://hakko-elec.co.jp/site/download/03tellus_inf/index.php
- https://jvn.jp/en/vu/JVNVU93840158/
- https://monitouch.fujielectric.com/site/download-e/03tellus_inf/index.php
