CVE-2022-43604
📋 TL;DR
CVE-2022-43604 is a critical out-of-bounds write vulnerability in the OpENer EtherNet/IP stack that allows remote attackers to crash servers or execute arbitrary code by sending specially crafted EtherNet/IP requests. This affects industrial control systems and devices using vulnerable versions of the OpENer stack. Organizations using EtherNet/IP communications with affected software are at risk.
💻 Affected Systems
- EIP Stack Group OpENer EtherNet/IP stack
📦 What is this software?
Opener by Opener Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, disruption of industrial processes, and potential physical damage in industrial environments.
Likely Case
Denial of service through server crashes disrupting EtherNet/IP communications and industrial operations.
If Mitigated
Limited impact if network segmentation isolates EtherNet/IP traffic and proper access controls are implemented.
🎯 Exploit Status
Exploitation requires sending specially crafted EtherNet/IP requests to the vulnerable GetAttributeList functionality. The vulnerability is well-documented with public technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in later commits after 58ee13c
Vendor Advisory: https://github.com/EIPStackGroup/OpENer
Restart Required: Yes
Instructions:
1. Update to latest OpENer version from official repository. 2. Recompile and redeploy affected applications. 3. Restart services using the OpENer stack.
🔧 Temporary Workarounds
Network Segmentation
allIsolate EtherNet/IP traffic to trusted networks only
Firewall Rules
linuxBlock unauthorized access to EtherNet/IP ports (typically TCP/UDP 44818)
iptables -A INPUT -p tcp --dport 44818 -j DROP
iptables -A INPUT -p udp --dport 44818 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate EtherNet/IP traffic from untrusted networks
- Deploy intrusion detection systems to monitor for anomalous EtherNet/IP traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check OpENer version and build commit. If using commit 58ee13c or earlier, system is vulnerable.Check Version:
Check application documentation or build information for OpENer version detailsVerify Fix Applied:
Verify OpENer has been updated to a version after commit 58ee13c and test EtherNet/IP functionality.📡 Detection & Monitoring
Log Indicators:
- Unexpected process crashes
- Abnormal EtherNet/IP request patterns
- Memory access violation errors
Network Indicators:
- Malformed EtherNet/IP packets targeting GetAttributeList
- Unusual traffic on port 44818
SIEM Query:
source_port:44818 AND (packet_size:>1500 OR protocol_anomaly:true)