CVE-2022-45790
📋 TL;DR
CVE-2022-45790 is an authentication bypass vulnerability in Omron's FINS protocol that allows brute-force attacks to access protected memory regions. This could enable attackers to overwrite PLC logic and manipulate industrial processes. Affected systems include Omron PLCs and engineering software using the vulnerable FINS protocol implementation.
💻 Affected Systems
- Omron PLCs with FINS protocol
- Omron engineering software using FINS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems leading to physical process manipulation, equipment damage, production shutdown, or safety system bypass.
Likely Case
Unauthorized access to PLC memory allowing logic modification, parameter changes, or operational disruption.
If Mitigated
Limited impact with proper network segmentation, authentication controls, and monitoring in place.
🎯 Exploit Status
Exploitation requires network access to FINS service and involves brute-forcing authentication. Public tools exist for FINS protocol interaction.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to vendor advisory OMSR-2023-010 for specific versions
Vendor Advisory: https://www.fa.omron.co.jp/product/security/assets/pdf/en/OMSR-2023-010_en.pdf
Restart Required: Yes
Instructions:
1. Review OMSR-2023-010 advisory. 2. Identify affected products. 3. Apply firmware updates from Omron. 4. Restart affected PLCs. 5. Verify patch application.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLC networks from untrusted networks using firewalls
Access Control Lists
linuxRestrict FINS protocol access to authorized IP addresses only
# Example firewall rule (adjust for your environment):
# iptables -A INPUT -p tcp --dport 9600 -s trusted_ip -j ACCEPT
# iptables -A INPUT -p tcp --dport 9600 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PLCs from untrusted networks
- Deploy intrusion detection systems to monitor for brute-force attempts on FINS protocol
🔍 How to Verify
Check if Vulnerable:
Check if system uses Omron PLCs with FINS protocol and if firmware versions match those listed in OMSR-2023-010Check Version:
Use Omron engineering software or consult device documentation for firmware version checkVerify Fix Applied:
Verify firmware version after update matches patched versions in vendor advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts on FINS service
- Unusual memory access patterns in PLC logs
Network Indicators:
- Brute-force patterns on TCP port 9600 (default FINS)
- Unexpected FINS protocol commands from unauthorized sources
SIEM Query:
source_port:9600 AND (event_type:authentication_failure OR event_count > threshold)🔗 References
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-262-05
- https://www.dragos.com/advisory/omron-plc-and-engineering-software-network-and-file-format-access/
- https://www.fa.omron.co.jp/product/security/assets/pdf/en/OMSR-2023-010_en.pdf
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-262-05
- https://www.dragos.com/advisory/omron-plc-and-engineering-software-network-and-file-format-access/
- https://www.fa.omron.co.jp/product/security/assets/pdf/en/OMSR-2023-010_en.pdf
