CVE-2019-10925
📋 TL;DR
This vulnerability in SIMATIC MV400 family devices allows authenticated attackers to escalate privileges via specially crafted requests to the integrated webserver. Attackers with network access and valid credentials can compromise device integrity and availability without user interaction. Affected are all SIMATIC MV400 family versions before V7.0.6.
💻 Affected Systems
- SIMATIC MV400 family
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to modify configurations, disrupt operations, or use device as pivot point in industrial network
Likely Case
Unauthorized privilege escalation leading to configuration changes, service disruption, or data manipulation
If Mitigated
Limited impact if proper network segmentation and access controls prevent attacker access
🎯 Exploit Status
Exploitation requires valid credentials but no user interaction; no public exploit code known at advisory publication
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V7.0.6
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-816980.pdf
Restart Required: Yes
Instructions:
1. Download firmware V7.0.6 from Siemens support portal. 2. Backup current configuration. 3. Apply firmware update via web interface or TIA Portal. 4. Restart device. 5. Verify version is V7.0.6 or higher.
🔧 Temporary Workarounds
Network Segmentation
allIsolate SIMATIC MV400 devices in separate network segments with strict access controls
Credential Hardening
allImplement strong password policies, multi-factor authentication, and regular credential rotation
🧯 If You Can't Patch
- Implement strict network access controls to limit connections to authorized IPs only
- Monitor for unusual authentication attempts or privilege escalation patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or TIA Portal; versions below V7.0.6 are vulnerableCheck Version:
Check via web interface at http://<device-ip>/ or using TIA Portal diagnostic toolsVerify Fix Applied:
Verify firmware version is V7.0.6 or higher in device settings📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful login and privilege changes
- Unusual request patterns to webserver endpoints
Network Indicators:
- Unusual traffic patterns to device webserver from unexpected sources
- Requests with crafted parameters targeting privilege escalation
SIEM Query:
source_ip="device_ip" AND (http_user_agent CONTAINS "unusual" OR http_request CONTAINS "privilege" OR "escalation")🔗 References
- http://www.securityfocus.com/bid/108725
- https://cert-portal.siemens.com/productcert/pdf/ssa-816980.pdf
- https://ics-cert.us-cert.gov/advisories/ICSA-19-162-02
- http://www.securityfocus.com/bid/108725
- https://cert-portal.siemens.com/productcert/pdf/ssa-816980.pdf
- https://ics-cert.us-cert.gov/advisories/ICSA-19-162-02
