CVE-2022-50978
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to disrupt operations by switching between multiple configuration presets via Modbus TCP. It affects industrial control systems and SCADA devices that use Modbus protocol with vulnerable configuration preset functionality. The attack requires network access to the Modbus TCP port.
💻 Affected Systems
- Innomic IDS industrial devices with Modbus TCP interface
⚠️ Risk & Real-World Impact
Worst Case
Complete operational disruption of industrial processes, potential safety incidents, or equipment damage from unintended configuration changes.
Likely Case
Temporary service disruption, configuration corruption requiring manual intervention, and operational downtime.
If Mitigated
Limited to denial of service with quick recovery possible if proper network segmentation and monitoring are in place.
🎯 Exploit Status
Exploitation requires knowledge of Modbus protocol and target device's configuration preset addresses/registers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in provided references
Vendor Advisory: https://www.innomic.com/.well-known/csaf/white/2026/ids-2026-0001.html
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patched firmware versions. 2. Download firmware from vendor portal. 3. Backup current configuration. 4. Apply firmware update following vendor instructions. 5. Verify update and restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Modbus TCP devices from untrusted networks using firewalls or network segmentation
Access Control Lists
linuxImplement strict IP-based access controls for Modbus TCP port (typically 502)
# Example iptables rule: iptables -A INPUT -p tcp --dport 502 -s trusted_ip -j ACCEPT
# iptables -A INPUT -p tcp --dport 502 -j DROP
🧯 If You Can't Patch
- Implement network monitoring for unusual Modbus traffic patterns
- Deploy intrusion detection systems with Modbus protocol anomaly detection
🔍 How to Verify
Check if Vulnerable:
Test if unauthenticated Modbus TCP connections can write to configuration preset registers using tools like modbus-cli or custom scriptsCheck Version:
Vendor-specific command via device interface or check firmware version in web interface/CLIVerify Fix Applied:
Verify firmware version matches patched version from vendor advisory and retest exploitation attempts📡 Detection & Monitoring
Log Indicators:
- Multiple configuration preset change events in short time
- Unauthorized IP addresses accessing Modbus TCP port
Network Indicators:
- Unusual Modbus function code 06 (Write Single Register) or 16 (Write Multiple Registers) to configuration addresses
- Rapid succession of write operations from single source
SIEM Query:
source_port=502 AND (function_code=06 OR function_code=16) AND dest_ip=[device_ip] | stats count by src_ip | where count > threshold