CVE-2023-0425
📋 TL;DR
A numeric range comparison vulnerability in ABB Freelance controllers allows attackers to cause denial of service by exploiting missing minimum value checks. This affects AC 700F and AC 900F controller modules across multiple Freelance versions, potentially making industrial control systems inaccessible.
💻 Affected Systems
- ABB Freelance controllers AC 700F
- ABB Freelance controllers AC 900F
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system unavailability causing production stoppage in industrial environments, potentially leading to safety incidents or significant operational disruption.
Likely Case
Controller becomes unresponsive or crashes, requiring manual restart and causing temporary production interruption.
If Mitigated
Limited impact with proper network segmentation and monitoring, allowing quick detection and recovery.
🎯 Exploit Status
Exploitation requires network access to the controller but no authentication. The vulnerability is in numeric range handling logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update available for versions under maintenance (specific version not provided in advisory)
Vendor Advisory: https://search.abb.com/library/Download.aspx?DocumentID=7PAA007517&LanguageCode=en&DocumentPartId=&Action=Launch
Restart Required: Yes
Instructions:
1. Contact ABB support for appropriate update. 2. Schedule maintenance window. 3. Apply update following ABB documentation. 4. Restart controllers. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate controllers in dedicated industrial network segments with strict access controls
Access Control Lists
allImplement network ACLs to restrict access to controller ports from authorized systems only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate controllers from general network traffic
- Deploy industrial intrusion detection systems to monitor for anomalous controller communications
🔍 How to Verify
Check if Vulnerable:
Check controller firmware version against affected versions list. Use ABB engineering tools to verify version.Check Version:
Use ABB Freelance engineering station software to read controller version informationVerify Fix Applied:
After update, verify firmware version is no longer in affected range using ABB engineering tools.📡 Detection & Monitoring
Log Indicators:
- Controller restart events
- Communication timeouts
- Abnormal process variable values
Network Indicators:
- Unexpected traffic to controller ports
- Multiple connection attempts to controller
SIEM Query:
source="industrial_controller" AND (event_type="restart" OR event_type="communication_error")🔗 References
- https://search.abb.com/library/Download.aspx?DocumentID=7PAA007517&LanguageCode=en&DocumentPartId=&Action=Launch&_ga=2.68514131.339223974.1691382343-1911411808.1686627590
- https://search.abb.com/library/Download.aspx?DocumentID=7PAA007517&LanguageCode=en&DocumentPartId=&Action=Launch&_ga=2.68514131.339223974.1691382343-1911411808.1686627590
