CVE-2018-14802
📋 TL;DR
This vulnerability in Fuji Electric FRENIC LOADER allows attackers to execute arbitrary code remotely by exploiting improper input validation of user-supplied comments. It affects multiple FRENIC product lines used in industrial control systems. Attackers can gain full control of affected devices without authentication.
💻 Affected Systems
- FRENIC-Mini (C1)
- FRENIC-Mini (C2)
- FRENIC-Eco
- FRENIC-Multi
- FRENIC-MEGA
- FRENIC-Ace
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to modify industrial processes, cause physical damage, disrupt operations, or establish persistent access to industrial networks.
Likely Case
Remote code execution leading to unauthorized control of industrial equipment, data theft, or disruption of manufacturing processes.
If Mitigated
Limited impact if systems are isolated in air-gapped networks with strict access controls and monitoring.
🎯 Exploit Status
CWE-121 (Stack-based Buffer Overflow) suggests straightforward exploitation. ICS-CERT advisory indicates public exploits may exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to FRENIC LOADER version 3.3 v7.3.4.1b or later
Vendor Advisory: https://ics-cert.us-cert.gov/advisories/ICSA-18-270-03
Restart Required: Yes
Instructions:
1. Download updated FRENIC LOADER from Fuji Electric support portal. 2. Backup existing configurations. 3. Install the updated software. 4. Restart affected systems. 5. Verify installation and restore configurations.
🔧 Temporary Workarounds
Network Segmentation
allIsolate FRENIC systems in dedicated industrial network segments with firewall rules blocking unnecessary traffic.
Access Control
allImplement strict access controls to limit who can connect to FRENIC LOADER interfaces.
🧯 If You Can't Patch
- Disconnect affected systems from networks or place behind firewalls with strict inbound/outbound rules
- Implement application whitelisting to prevent execution of unauthorized code
🔍 How to Verify
Check if Vulnerable:
Check FRENIC LOADER version in software interface or About dialog. If version is 3.3 v7.3.4.1a or earlier, system is vulnerable.Check Version:
Check via FRENIC LOADER GUI: Help → About or similar menu optionVerify Fix Applied:
Verify FRENIC LOADER version shows 3.3 v7.3.4.1b or later. Test comment input functionality with boundary values.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from FRENIC LOADER
- Multiple failed comment submissions
- Buffer overflow error messages
Network Indicators:
- Unexpected network connections from FRENIC systems
- Traffic to/from FRENIC LOADER ports (typically 502/TCP Modbus)
SIEM Query:
source="frenic-loader" AND (event_type="buffer_overflow" OR process_name="cmd.exe" OR process_name="powershell.exe")