CVE-2022-2502
📋 TL;DR
A buffer overflow vulnerability in the HCI IEC 60870-5-104 function of RTU500 series products allows remote attackers to cause targeted CMU units to reboot by sending specially crafted messages. This affects RTU500 systems configured with IEC 62351-5 support and the separately licensed 'Advanced security' feature. The vulnerability results from missing input validation in industrial control system components.
💻 Affected Systems
- RTU500 series
📦 What is this software?
Rtu500 Firmware by Hitachienergy
Rtu500 Firmware by Hitachienergy
Rtu500 Firmware by Hitachienergy
Rtu500 Firmware by Hitachienergy
⚠️ Risk & Real-World Impact
Worst Case
Persistent denial-of-service attacks could disrupt critical industrial operations by repeatedly rebooting RTU500 CMU units, potentially causing process interruptions in SCADA/ICS environments.
Likely Case
Temporary service disruption through CMU reboots, requiring manual intervention to restore normal operations in affected industrial control systems.
If Mitigated
Limited impact with proper network segmentation and security controls, as the vulnerability requires specific licensed features and configurations to be exploitable.
🎯 Exploit Status
Exploitation requires knowledge of IEC 60870-5-104 protocol and access to the network where RTU500 is deployed
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references
Vendor Advisory: https://publisher.hitachienergy.com/preview?DocumentID=8DBD000121&LanguageCode=en&DocumentPartId=&Action=Launch
Restart Required: Yes
Instructions:
1. Contact Hitachi Energy/ABB for specific patch information 2. Apply vendor-provided firmware updates 3. Restart affected RTU500 CMU units 4. Verify configuration changes
🔧 Temporary Workarounds
Disable vulnerable configuration
allRemove IEC 62351-5 support from HCI 60870-5-104 configuration if not required
Network segmentation
allIsolate RTU500 systems in separate network segments with strict access controls
🧯 If You Can't Patch
- Implement strict network access controls to limit communication to RTU500 systems
- Deploy intrusion detection systems monitoring for anomalous IEC 60870-5-104 traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check RTU500 configuration for HCI 60870-5-104 with IEC 62351-5 support and verify 'Advanced security' license is presentCheck Version:
Vendor-specific commands through RTU500 management interfaceVerify Fix Applied:
Verify firmware version against vendor recommendations and confirm IEC 62351-5 configuration is either updated or disabled📡 Detection & Monitoring
Log Indicators:
- Unexpected CMU reboots
- Abnormal IEC 60870-5-104 message patterns
- Buffer overflow error messages
Network Indicators:
- Malformed IEC 60870-5-104 packets
- Unusual traffic patterns to RTU500 ports
- Multiple connection attempts with crafted messages
SIEM Query:
source="rtu500" AND (event_type="reboot" OR error_message="buffer_overflow")