CVE-2020-10038
📋 TL;DR
This vulnerability allows unauthenticated attackers to execute administrative commands on Siemens SICAM devices via the web server. Affected systems include SICAM MMU, SGU, and T devices running vulnerable versions. Attackers with network access can gain administrative control without credentials.
💻 Affected Systems
- SICAM MMU
- SICAM SGU
- SICAM T
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of industrial control systems, allowing attackers to modify configurations, disrupt operations, or use devices as footholds into critical infrastructure networks.
Likely Case
Unauthorized administrative access leading to configuration changes, data manipulation, or service disruption of affected SICAM devices.
If Mitigated
Limited impact if devices are properly segmented and access-controlled, though the vulnerability remains exploitable within allowed network segments.
🎯 Exploit Status
Exploitation requires only web access to the device. No authentication or special tools needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SICAM MMU: V2.05 or later, SICAM T: V2.18 or later, SICAM SGU: No fixed version - consider replacement
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-305120.pdf
Restart Required: Yes
Instructions:
1. Download firmware updates from Siemens support portal. 2. Backup device configuration. 3. Apply firmware update following Siemens documentation. 4. Verify update completion and restore configuration if needed.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SICAM devices in separate network segments with strict access controls.
Web Server Disablement
allDisable web server interface if not required for operations.
🧯 If You Can't Patch
- Implement strict network access controls to limit web server access to authorized IPs only
- Deploy web application firewall (WAF) rules to block unauthorized administrative command execution
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. Compare against vulnerable versions: MMU < V2.05, SGU any version, T < V2.18.Check Version:
Check via web interface at http://device-ip/status or consult Siemens documentation for CLI commands.Verify Fix Applied:
Verify firmware version shows MMU >= V2.05 or T >= V2.18. For SGU, no fixed version exists - consider device replacement.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated administrative commands in web server logs
- Configuration changes without authenticated user sessions
Network Indicators:
- HTTP requests to administrative endpoints without authentication headers
- Unusual administrative commands from unexpected source IPs
SIEM Query:
source="sicam-web" AND (action="admin_command" OR uri="/admin/*") AND NOT user!="anonymous"