CVE-2022-42784
📋 TL;DR
This vulnerability affects Siemens LOGO! programmable logic controllers (PLCs) and allows attackers to perform electromagnetic fault injection attacks. Successful exploitation could enable firmware dumping, memory manipulation, and certificate injection, potentially allowing device impersonation and unauthorized communication. All LOGO! devices running firmware version V8.3 or higher are affected.
💻 Affected Systems
- LOGO! 12/24RCE (6ED1052-1MD08-0BA1)
- LOGO! 12/24RCEo (6ED1052-2MD08-0BA1)
- LOGO! 230RCE (6ED1052-1FB08-0BA1)
- LOGO! 230RCEo (6ED1052-2FB08-0BA1)
- LOGO! 24CE (6ED1052-1CC08-0BA1)
- LOGO! 24CEo (6ED1052-2CC08-0BA1)
- LOGO! 24RCE (6ED1052-1HB08-0BA1)
- LOGO! 24RCEo (6ED1052-2HB08-0BA1)
- SIPLUS LOGO! 12/24RCE (6AG1052-1MD08-7BA1)
- SIPLUS LOGO! 12/24RCEo (6AG1052-2MD08-7BA1)
- SIPLUS LOGO! 230RCE (6AG1052-1FB08-7BA1)
- SIPLUS LOGO! 230RCEo (6AG1052-2FB08-7BA1)
- SIPLUS LOGO! 24CE (6AG1052-1CC08-7BA1)
- SIPLUS LOGO! 24CEo (6AG1052-2CC08-7BA1)
- SIPLUS LOGO! 24RCE (6AG1052-1HB08-7BA1)
- SIPLUS LOGO! 24RCEo (6AG1052-2HB08-7BA1)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could dump firmware, manipulate device memory, inject custom certificates signed by the product CA, impersonate legitimate devices, and potentially gain full control over industrial processes.
Likely Case
Skilled attackers with physical access could extract firmware secrets, manipulate device behavior, or create rogue devices that appear legitimate to the network.
If Mitigated
With proper physical security controls and network segmentation, the impact is limited to isolated systems with no ability to propagate to other network segments.
🎯 Exploit Status
Exploitation requires physical access and specialized electromagnetic fault injection equipment. No authentication is needed once physical access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to firmware version V8.4 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-844582.html
Restart Required: Yes
Instructions:
1. Download firmware update from Siemens Industry Online Support
2. Connect to LOGO! device using LOGO! Soft Comfort software
3. Backup current configuration and program
4. Upload new firmware version V8.4 or later
5. Restart the device
6. Restore configuration and program
7. Verify firmware version is updated
🔧 Temporary Workarounds
Physical Security Enhancement
allImplement strict physical access controls to prevent unauthorized personnel from accessing LOGO! devices
Network Segmentation
allIsolate LOGO! devices in separate network segments with strict firewall rules to limit communication
🧯 If You Can't Patch
- Implement strict physical security controls including locked cabinets, surveillance, and access logging
- Deploy network monitoring to detect anomalous device communications or certificate changes
- Consider replacing vulnerable devices with updated models if critical systems are affected
🔍 How to Verify
Check if Vulnerable:
Check device firmware version through LOGO! Soft Comfort software or web interface. If version is V8.3 or higher, the device is vulnerable.Check Version:
Use LOGO! Soft Comfort software: Connect to device → Device → Device Information → Check Firmware VersionVerify Fix Applied:
After updating, verify firmware version shows V8.4 or later in LOGO! Soft Comfort software or device interface.📡 Detection & Monitoring
Log Indicators:
- Unexpected device restarts or firmware update attempts
- Certificate changes or new certificate installations
- Unusual physical access logs to device locations
Network Indicators:
- Unexpected certificate-based authentication attempts
- Communication from devices with unusual certificates
- Traffic patterns inconsistent with normal PLC operations
SIEM Query:
Search for: (device_type="LOGO! PLC") AND (event_type="firmware_update" OR "certificate_change" OR "unexpected_restart")