CVE-2020-18754
📋 TL;DR
CVE-2020-18754 is an information disclosure vulnerability in Dut Computer Control Engineering Co.'s PLC MAC1100 that allows unauthorized access to sensitive data. This affects organizations using the vulnerable PLC models in industrial control systems. Attackers can exploit this to leak configuration data, credentials, or operational information.
💻 Affected Systems
- DCCE PLC MAC1100
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control system with exposure of sensitive operational data, credentials, and configuration files leading to potential physical damage or production disruption.
Likely Case
Unauthorized access to PLC configuration data, network settings, and potentially credentials that could facilitate further attacks on the industrial network.
If Mitigated
Limited exposure of non-critical configuration data with no access to operational controls or sensitive credentials.
🎯 Exploit Status
Public GitHub repository contains proof-of-concept demonstrating information leakage. Exploit requires network access to PLC but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Latest firmware from vendor
Vendor Advisory: Not publicly documented
Restart Required: Yes
Instructions:
1. Contact DCCE for latest firmware. 2. Backup current configuration. 3. Apply firmware update via programming software. 4. Restart PLC. 5. Restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLC from untrusted networks using firewalls and VLANs
Access Control Lists
allImplement strict network access controls to limit who can communicate with PLC
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PLC from untrusted networks
- Deploy intrusion detection systems to monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Test network access to PLC on vulnerable ports and attempt to retrieve configuration data without authenticationCheck Version:
Check firmware version via PLC programming software or web interface if availableVerify Fix Applied:
After patching, attempt same exploit techniques to confirm information is no longer accessible📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to PLC configuration endpoints
- Unusual data retrieval patterns from PLC
Network Indicators:
- Unusual traffic to PLC on configuration ports from unauthorized sources
- Data exfiltration patterns from PLC
SIEM Query:
source_ip=* AND dest_ip=PLC_IP AND (port=502 OR port=80) AND bytes_out > threshold