CVE-2023-28489
📋 TL;DR
This vulnerability allows unauthenticated remote attackers to execute arbitrary commands on Siemens CP-8031 and CP-8050 MASTER MODULE devices via command injection through the web server on port 443/tcp. The attack requires the 'Remote Operation' parameter to be enabled, which is disabled by default. Organizations using these industrial control system devices are affected.
💻 Affected Systems
- Siemens CP-8031 MASTER MODULE
- Siemens CP-8050 MASTER MODULE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems leading to operational disruption, safety hazards, data theft, or physical damage to critical infrastructure.
Likely Case
Unauthorized access to device configuration, data exfiltration, installation of persistent backdoors, or disruption of industrial processes.
If Mitigated
Limited impact if Remote Operation is disabled and proper network segmentation is in place.
🎯 Exploit Status
Public exploit code available, attack requires minimal technical skill when Remote Operation is enabled.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CPCI85 V05 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-472454.pdf
Restart Required: Yes
Instructions:
1. Download CPCI85 V05 or later firmware from Siemens support portal. 2. Backup device configuration. 3. Apply firmware update following Siemens documentation. 4. Verify update successful and restore configuration if needed.
🔧 Temporary Workarounds
Disable Remote Operation
allDisable the vulnerable Remote Operation parameter to prevent exploitation.
Access device web interface -> Configuration -> Network Settings -> Disable 'Remote Operation' parameter
Restrict Network Access
linuxBlock external access to port 443/tcp on affected devices.
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="0.0.0.0/0" port port="443" protocol="tcp" reject'
firewall-cmd --reload
🧯 If You Can't Patch
- Ensure 'Remote Operation' parameter is disabled on all affected devices
- Implement strict network segmentation and firewall rules to isolate affected devices from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version < CPCI85 V05 AND Remote Operation is enabled, device is vulnerable.Check Version:
Check via device web interface: System Information -> Firmware VersionVerify Fix Applied:
Verify firmware version is CPCI85 V05 or later and Remote Operation status is disabled.📡 Detection & Monitoring
Log Indicators:
- Unusual web server access patterns
- Unexpected command execution attempts in system logs
- Multiple failed authentication attempts followed by successful access
Network Indicators:
- Unusual traffic to port 443/tcp with command injection patterns
- Outbound connections from device to unexpected destinations
SIEM Query:
source="device_logs" AND ("Remote Operation" OR "command injection" OR suspicious_web_requests)🔗 References
- http://packetstormsecurity.com/files/173370/Siemens-A8000-CP-8050-CP-8031-Code-Execution-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jul/14
- https://cert-portal.siemens.com/productcert/pdf/ssa-472454.pdf
- http://packetstormsecurity.com/files/173370/Siemens-A8000-CP-8050-CP-8031-Code-Execution-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jul/14
- https://cert-portal.siemens.com/productcert/pdf/ssa-472454.pdf
