CVE-2023-27772
📋 TL;DR
CVE-2023-27772 is a segmentation fault vulnerability in libiec61850's ControlObjectClient_setOrigin() function that can cause denial of service or potentially allow arbitrary code execution. This affects systems using libiec61850 v1.5.1 for IEC 61850 communication in industrial control and energy management systems.
💻 Affected Systems
- libiec61850
📦 What is this software?
Libiec61850 by Mz Automation
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, disruption of critical infrastructure operations, or manipulation of industrial control systems.
Likely Case
Denial of service causing application crashes and disruption of IEC 61850 communication in industrial environments.
If Mitigated
Application crash with limited impact if proper network segmentation and process isolation are implemented.
🎯 Exploit Status
The vulnerability is in a core library function that handles control operations, making exploitation feasible for attackers with network access to affected systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 79a8eaf26070e02044afc4b2ffbfe777dfdf3e0b
Vendor Advisory: https://github.com/mz-automation/libiec61850/commit/79a8eaf26070e02044afc4b2ffbfe777dfdf3e0b
Restart Required: Yes
Instructions:
1. Update libiec61850 to version containing commit 79a8eaf26070e02044afc4b2ffbfe777dfdf3e0b
2. Recompile any applications using libiec61850
3. Restart affected services
4. Test IEC 61850 functionality
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict access to IEC 61850 ports (typically 102) to trusted networks only
iptables -A INPUT -p tcp --dport 102 -s trusted_network -j ACCEPT
iptables -A INPUT -p tcp --dport 102 -j DROP
Process Isolation
linuxRun libiec61850 applications with minimal privileges and in isolated environments
sudo systemctl edit your_service -- add 'User=nobody' and 'Group=nogroup'
sudo setcap -r /path/to/application
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted IEC 61850 clients only
- Deploy intrusion detection systems monitoring for abnormal IEC 61850 traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check libiec61850 version: strings /usr/lib/libiec61850.so | grep 'libiec61850' or check application dependencies for version 1.5.1Check Version:
pkg-config --modversion libiec61850 || strings /usr/lib/libiec61850.so 2>/dev/null | grep -i versionVerify Fix Applied:
Verify the library version is updated and test ControlObjectClient functionality without crashes📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected termination of IEC 61850 services
- Core dumps from libiec61850 processes
Network Indicators:
- Abnormal IEC 61850 MMS traffic patterns
- Multiple connection attempts to port 102 followed by service crashes
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "SIGSEGV") AND "libiec61850"