CVE-2019-13923
📋 TL;DR
This vulnerability allows cross-site scripting (XSS) attacks on Siemens IE/WSN-PA Link WirelessHART Gateways. Attackers can inject malicious scripts via specially crafted links, potentially compromising user sessions and device control. Users must be logged into the web interface for successful exploitation.
💻 Affected Systems
- Siemens IE/WSN-PA Link WirelessHART Gateway
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover, credential theft, installation of persistent backdoors, and lateral movement within industrial control networks.
Likely Case
Session hijacking, unauthorized configuration changes, and potential disruption of WirelessHART network operations.
If Mitigated
Limited to isolated session compromise if proper network segmentation and access controls are implemented.
🎯 Exploit Status
Requires user to be logged into web interface and click malicious link. No public exploits known at advisory publication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to firmware version 4.0.1 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-191683.pdf
Restart Required: Yes
Instructions:
1. Download firmware update from Siemens support portal. 2. Backup current configuration. 3. Apply firmware update via web interface. 4. Restart device. 5. Verify update successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate WirelessHART gateways from untrusted networks and restrict web interface access
Access Control Lists
allImplement strict firewall rules to limit access to gateway web interface
🧯 If You Can't Patch
- Implement strict network segmentation to isolate devices from untrusted networks
- Enforce strong authentication and session management controls
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface > System Information. Versions below 4.0.1 are vulnerable.Check Version:
Access web interface and navigate to System Information pageVerify Fix Applied:
Verify firmware version shows 4.0.1 or later in System Information page.📡 Detection & Monitoring
Log Indicators:
- Unusual web interface access patterns
- Multiple failed login attempts followed by successful login
- Configuration changes from unexpected sources
Network Indicators:
- HTTP requests with suspicious parameters to gateway web interface
- Outbound connections from gateway to unexpected destinations
SIEM Query:
source="gateway_web_logs" AND (uri CONTAINS "script" OR uri CONTAINS "javascript" OR uri CONTAINS "onerror")