CVE-2022-43606
📋 TL;DR
A use-of-uninitialized-pointer vulnerability in EIP Stack Group OpENer's Forward Open connection management allows attackers to crash the server by sending specially-crafted EtherNet/IP requests. This affects industrial control systems and devices using vulnerable versions of the OpENer EtherNet/IP stack. The vulnerability requires network access to the target system.
💻 Affected Systems
- EIP Stack Group OpENer
📦 What is this software?
Opener by Opener Project
⚠️ Risk & Real-World Impact
Worst Case
Complete denial of service causing industrial process disruption, potentially leading to safety incidents or production downtime in critical infrastructure.
Likely Case
Service disruption through server crashes requiring manual restart, impacting operational continuity in industrial environments.
If Mitigated
Limited impact with proper network segmentation and monitoring, allowing quick detection and recovery from crashes.
🎯 Exploit Status
Exploit requires sending crafted EtherNet/IP packets to the vulnerable service. Public details available in Talos reports.
🛠️ 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 GitHub repository. 2. Rebuild and redeploy affected applications. 3. Restart services using the updated stack.
🔧 Temporary Workarounds
Network Segmentation
allIsolate EtherNet/IP services from untrusted networks using firewalls or VLANs.
Access Control Lists
allRestrict access to EtherNet/IP ports (typically TCP/UDP 44818) to authorized systems only.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy intrusion detection systems monitoring for EtherNet/IP protocol anomalies
🔍 How to Verify
Check if Vulnerable:
Check OpENer version/commit hash against vulnerable version 58ee13c. Review system logs for crashes related to EtherNet/IP services.Check Version:
Check application documentation or build information for OpENer version detailsVerify Fix Applied:
Verify updated to commit after 58ee13c. Test with EtherNet/IP requests to confirm service stability.📡 Detection & Monitoring
Log Indicators:
- Unexpected service crashes
- Segmentation faults in EtherNet/IP processes
- Connection resets on port 44818
Network Indicators:
- Malformed EtherNet/IP packets
- Multiple connection attempts to port 44818
- Unusual traffic patterns to industrial protocols
SIEM Query:
source="*" ("OpENer" OR "EtherNet/IP") AND ("crash" OR "segfault" OR "abnormal termination")