CVE-2021-40333
📋 TL;DR
This CVE describes a weak password requirements vulnerability in Hitachi Energy FOX61x and XCM20 devices that allows attackers to gain unauthorized access to Data Communication Network routing configuration. Affected systems are FOX61x and XCM20 versions prior to R15A, potentially compromising network routing controls.
💻 Affected Systems
- Hitachi Energy FOX61x
- Hitachi Energy XCM20
📦 What is this software?
Fox615 Firmware by Hitachienergy
Xcm20 Firmware by Hitachienergy
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of DCN routing configuration leading to network disruption, data interception, or redirection of critical infrastructure communications.
Likely Case
Unauthorized access to network configuration allowing route manipulation, potential data leakage, and network instability.
If Mitigated
Limited impact with strong network segmentation and monitoring, though configuration access remains a concern.
🎯 Exploit Status
Exploitation requires weak password conditions but is straightforward once identified.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: R15A
Vendor Advisory: https://search.abb.com/library/Download.aspx?DocumentID=8DBD000062
Restart Required: Yes
Instructions:
1. Download R15A firmware from Hitachi Energy support portal. 2. Backup current configuration. 3. Apply firmware update following vendor documentation. 4. Verify successful update and restore configuration if needed.
🔧 Temporary Workarounds
Enforce Strong Password Policy
allImplement and enforce complex password requirements for all administrative accounts.
Network Segmentation
allIsolate affected devices in separate network segments with strict access controls.
🧯 If You Can't Patch
- Implement multi-factor authentication for administrative access
- Deploy network monitoring and alerting for unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is earlier than R15A, device is vulnerable.Check Version:
Check via device web interface or vendor-specific CLI commands (varies by model).Verify Fix Applied:
Confirm firmware version shows R15A or later in device management interface.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts
- Successful logins from unusual IPs
- Configuration change events
Network Indicators:
- Unexpected routing table changes
- Unusual network traffic patterns from device
SIEM Query:
source="fox61x" OR source="xcm20" AND (event_type="auth_failure" OR event_type="config_change")🔗 References
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000062&LanguageCode=en&DocumentPartId=&Action=Launch
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000069&LanguageCode=en&DocumentPartId=&Action=Launch
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000062&LanguageCode=en&DocumentPartId=&Action=Launch
- https://search.abb.com/library/Download.aspx?DocumentID=8DBD000069&LanguageCode=en&DocumentPartId=&Action=Launch
