CVE-2021-38413
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on affected Fuji Electric industrial control systems through a stack-based buffer overflow. It affects organizations using V-Server Lite and Tellus Lite V-Simulator software for industrial automation. Successful exploitation could give attackers control over industrial processes.
💻 Affected Systems
- Fuji Electric V-Server Lite
- Fuji Electric Tellus Lite V-Simulator
📦 What is this software?
V Server by Fujielectric
V Simulator by Fujielectric
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems leading to physical damage, production disruption, or safety incidents.
Likely Case
Unauthorized access to industrial control networks, data theft, or disruption of industrial processes.
If Mitigated
Limited impact if systems are isolated, patched, or protected by network segmentation and access controls.
🎯 Exploit Status
Buffer overflow vulnerabilities in industrial control software are attractive targets for sophisticated attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.0.12.0 and later
Vendor Advisory: https://www.cisa.gov/uscert/ics/advisories/icsa-21-299-01
Restart Required: Yes
Instructions:
1. Download v4.0.12.0 or later from Fuji Electric. 2. Backup current configuration. 3. Install update following vendor instructions. 4. Restart system. 5. Verify version update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected systems from untrusted networks using firewalls and VLANs.
Access Control Restrictions
allImplement strict network access controls and disable unnecessary services.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected systems from other networks.
- Deploy intrusion detection/prevention systems specifically configured for ICS protocols.
🔍 How to Verify
Check if Vulnerable:
Check software version in application interface or Windows Programs and Features.Check Version:
Check through application interface or Windows Control Panel > Programs and Features.Verify Fix Applied:
Verify version is v4.0.12.0 or later in application interface.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation
- Unexpected network connections to industrial control ports
- Application crashes
Network Indicators:
- Unusual traffic patterns to industrial control ports
- Protocol anomalies in industrial communications
SIEM Query:
source="industrial_control_system" AND (event_type="crash" OR process_name="v-server" OR port=502 OR port=44818)