CVE-2023-33919
📋 TL;DR
This vulnerability allows authenticated privileged remote attackers to execute arbitrary commands with root privileges on Siemens CP-8031 and CP-8050 MASTER MODULE devices. The command injection occurs through the web interface due to insufficient input validation. Only devices running versions before CPCI85 V05 are affected.
💻 Affected Systems
- Siemens CP-8031 MASTER MODULE
- Siemens CP-8050 MASTER MODULE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with root-level code execution, allowing complete control of affected industrial control devices, potential disruption of industrial processes, and lateral movement within operational technology networks.
Likely Case
Privileged authenticated attackers gaining remote code execution to install malware, exfiltrate sensitive industrial data, or disrupt device functionality.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and monitoring preventing successful exploitation attempts.
🎯 Exploit Status
Exploit details and proof-of-concept code are publicly available. Requires authenticated privileged access but exploitation is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: CPCI85 V05 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-731916.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 successful update and restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from untrusted networks and restrict access to authorized management systems only.
Access Control Hardening
allImplement strong authentication mechanisms, multi-factor authentication if possible, and limit privileged account access.
🧯 If You Can't Patch
- Implement strict network access controls to limit web interface access to only authorized management systems
- Deploy web application firewall (WAF) rules to detect and block command injection attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is below CPCI85 V05, device is vulnerable.Check Version:
Check via device web interface under System Information or use vendor-specific CLI commands for version verification.Verify Fix Applied:
Verify firmware version is CPCI85 V05 or later after applying update.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution patterns in web interface logs
- Multiple failed authentication attempts followed by successful privileged access
- Suspicious system command execution
Network Indicators:
- Unusual outbound connections from industrial control devices
- Traffic patterns indicating command injection attempts to web interface endpoints
SIEM Query:
source="industrial_device_logs" AND (event_type="command_execution" OR event_type="web_interface_access") AND (user="privileged_account" OR command="*;*" OR command="*|*")🔗 References
- http://packetstormsecurity.com/files/173370/Siemens-A8000-CP-8050-CP-8031-Code-Execution-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jul/14
- http://seclists.org/fulldisclosure/2024/Jul/4
- https://cert-portal.siemens.com/productcert/pdf/ssa-731916.pdf
- http://packetstormsecurity.com/files/173370/Siemens-A8000-CP-8050-CP-8031-Code-Execution-Command-Injection.html
- http://seclists.org/fulldisclosure/2023/Jul/14
- http://seclists.org/fulldisclosure/2024/Jul/4
- http://seclists.org/fulldisclosure/2025/Feb/19
- https://cert-portal.siemens.com/productcert/pdf/ssa-731916.pdf
