CVE-2024-39589
📋 TL;DR
This vulnerability allows attackers to cause denial of service in OpenPLC Runtime by sending specially crafted EtherNet/IP requests that trigger invalid pointer dereferences. It affects OpenPLC_v3 installations using EtherNet/IP functionality. Industrial control systems using vulnerable OpenPLC versions are at risk.
💻 Affected Systems
- OpenPLC Runtime
📦 What is this software?
Openplc V3 Firmware by Openplcproject
⚠️ Risk & Real-World Impact
Worst Case
Complete PLC runtime crash leading to industrial process disruption, production downtime, and potential safety implications in critical infrastructure.
Likely Case
PLC runtime instability or crash requiring manual restart, causing temporary process interruption.
If Mitigated
Minimal impact with proper network segmentation and monitoring detecting anomalous EtherNet/IP traffic.
🎯 Exploit Status
Exploitation requires sending crafted EtherNet/IP packets to the vulnerable service port.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check OpenPLC repository for commits after 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56a
Vendor Advisory: https://talosintelligence.com/vulnerability_reports/TALOS-2024-2016
Restart Required: Yes
Instructions:
1. Update OpenPLC Runtime to latest version from official repository. 2. Recompile and redeploy the runtime. 3. Restart the OpenPLC service.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to EtherNet/IP port (typically TCP 44818) to trusted devices only.
iptables -A INPUT -p tcp --dport 44818 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 44818 -j DROP
Disable EtherNet/IP
allTurn off EtherNet/IP functionality if not required for operations.
Modify OpenPLC configuration to disable EtherNet/IP server
🧯 If You Can't Patch
- Implement strict network access controls to EtherNet/IP port (TCP 44818)
- Deploy network intrusion detection systems to monitor for anomalous EtherNet/IP traffic
🔍 How to Verify
Check if Vulnerable:
Check OpenPLC version against vulnerable commit hash: git log --oneline | grep 16bf8bac1a36d95b73e7b8722d0edb8b9c5bb56aCheck Version:
git log --oneline -1Verify Fix Applied:
Verify current commit is newer than vulnerable hash: git log --oneline -1📡 Detection & Monitoring
Log Indicators:
- OpenPLC runtime crashes
- Abnormal EtherNet/IP connection attempts
- Memory access violation errors
Network Indicators:
- Unusual volume of EtherNet/IP packets to port 44818
- Malformed EtherNet/IP protocol messages
SIEM Query:
source="openplc.log" AND ("crash" OR "segmentation fault" OR "pointer dereference")