CVE-2021-37208
📋 TL;DR
This vulnerability allows attackers in a privileged position to execute cross-site scripting (XSS) attacks on affected Siemens RUGGEDCOM industrial network devices. By exploiting improper input sanitization on web server configuration pages, attackers can steal sensitive information or perform unauthorized actions. The vulnerability affects numerous RUGGEDCOM product models across multiple versions.
💻 Affected Systems
- RUGGEDCOM i800
- RUGGEDCOM i800NC
- RUGGEDCOM i801
- RUGGEDCOM i801NC
- RUGGEDCOM i802
- RUGGEDCOM i802NC
- RUGGEDCOM i803
- RUGGEDCOM i803NC
- RUGGEDCOM M2100
- RUGGEDCOM M2100F
- RUGGEDCOM M2100NC
- RUGGEDCOM M2200
- RUGGEDCOM M2200F
- RUGGEDCOM M2200NC
- RUGGEDCOM M969
- RUGGEDCOM M969F
- RUGGEDCOM M969NC
- RUGGEDCOM RMC30
- RUGGEDCOM RMC30NC
- RUGGEDCOM RMC8388 V4.X
- RUGGEDCOM RMC8388 V5.X
- RUGGEDCOM RMC8388NC V4.X
- RUGGEDCOM RMC8388NC V5.X
- RUGGEDCOM RP110
- RUGGEDCOM RP110NC
- RUGGEDCOM RS1600
- RUGGEDCOM RS1600F
- RUGGEDCOM RS1600FNC
- RUGGEDCOM RS1600NC
- RUGGEDCOM RS1600T
- RUGGEDCOM RS1600TNC
- RUGGEDCOM RS400
- RUGGEDCOM RS400F
- RUGGEDCOM RS400NC
- RUGGEDCOM RS401
- RUGGEDCOM RS401NC
- RUGGEDCOM RS416
- RUGGEDCOM RS416F
- RUGGEDCOM RS416NC
- RUGGEDCOM RS416NCv2 V4.X
- RUGGEDCOM RS416NCv2 V5.X
- RUGGEDCOM RS416P
- RUGGEDCOM RS416PF
- RUGGEDCOM RS416PNC
- RUGGEDCOM RS416PNCv2 V4.X
- RUGGEDCOM RS416PNCv2 V5.X
- RUGGEDCOM RS416Pv2 V4.X
- RUGGEDCOM RS416Pv2 V5.X
- RUGGEDCOM RS416v2 V4.X
- RUGGEDCOM RS416v2 V5.X
- RUGGEDCOM RS8000
- RUGGEDCOM RS8000A
- RUGGEDCOM RS8000ANC
- RUGGEDCOM RS8000H
- RUGGEDCOM RS8000HNC
- RUGGEDCOM RS8000NC
- RUGGEDCOM RS8000T
- RUGGEDCOM RS8000TNC
- RUGGEDCOM RS900
- RUGGEDCOM RS900 (32M) V4.X
- RUGGEDCOM RS900 (32M) V5.X
- RUGGEDCOM RS900F
- RUGGEDCOM RS900G
- RUGGEDCOM RS900G (32M) V4.X
- RUGGEDCOM RS900G (32M) V5.X
- RUGGEDCOM RS900GF
- RUGGEDCOM RS900GNC
- RUGGEDCOM RS900GNC(32M) V4.X
- RUGGEDCOM RS900GNC(32M) V5.X
- RUGGEDCOM RS900GP
- RUGGEDCOM RS900GPF
- RUGGEDCOM RS900GPNC
- RUGGEDCOM RS900L
- RUGGEDCOM RS900LNC
- RUGGEDCOM RS900M-GETS-C01
- RUGGEDCOM RS900M-GETS-XX
- RUGGEDCOM RS900M-STND-C01
- RUGGEDCOM RS900M-STND-XX
- RUGGEDCOM RS900MNC-GETS-C01
- RUGGEDCOM RS900MNC-GETS-XX
- RUGGEDCOM RS900MNC-STND-XX
- RUGGEDCOM RS900MNC-STND-XX-C01
- RUGGEDCOM RS900NC
- RUGGEDCOM RS900NC(32M) V4.X
- RUGGEDCOM RS900NC(32M) V5.X
- RUGGEDCOM RS900W
- RUGGEDCOM RS910
- RUGGEDCOM RS910L
- RUGGEDCOM RS910LNC
- RUGGEDCOM RS910NC
- RUGGEDCOM RS910W
- RUGGEDCOM RS920L
- RUGGEDCOM RS920LNC
- RUGGEDCOM RS920W
- RUGGEDCOM RS930L
- RUGGEDCOM RS930LNC
- RUGGEDCOM RS930W
- RUGGEDCOM RS940G
- RUGGEDCOM RS940GF
- RUGGEDCOM RS940GNC
- RUGGEDCOM RS969
- RUGGEDCOM RS969NC
- RUGGEDCOM RSG2100
- RUGGEDCOM RSG2100 (32M) V4.X
- RUGGEDCOM RSG2100 (32M) V5.X
- RUGGEDCOM RSG2100F
- RUGGEDCOM RSG2100NC
- RUGGEDCOM RSG2100NC(32M) V4.X
- RUGGEDCOM RSG2100NC(32M) V5.X
- RUGGEDCOM RSG2100P
- RUGGEDCOM RSG2100P (32M) V4.X
- RUGGEDCOM RSG2100P (32M) V5.X
- RUGGEDCOM RSG2100PF
- RUGGEDCOM RSG2100PNC
- RUGGEDCOM RSG2100PNC (32M) V4.X
- RUGGEDCOM RSG2100PNC (32M) V5.X
- RUGGEDCOM RSG2200
- RUGGEDCOM RSG2200F
- RUGGEDCOM RSG2200NC
- RUGGEDCOM RSG2288 V4.X
- RUGGEDCOM RSG2288 V5.X
- RUGGEDCOM RSG2288NC V4.X
- RUGGEDCOM RSG2288NC V5.X
- RUGGEDCOM RSG2300 V4.X
- RUGGEDCOM RSG2300 V5.X
- RUGGEDCOM RSG2300F
- RUGGEDCOM RSG2300NC V4.X
- RUGGEDCOM RSG2300NC V5.X
- RUGGEDCOM RSG2300P V4.X
- RUGGEDCOM RSG2300P V5.X
- RUGGEDCOM RSG2300PF
- RUGGEDCOM RSG2300PNC V4.X
- RUGGEDCOM RSG2300PNC V5.X
- RUGGEDCOM RSG2488 V4.X
- RUGGEDCOM RSG2488 V5.X
- RUGGEDCOM RSG2488F
- RUGGEDCOM RSG2488NC V4.X
- RUGGEDCOM RSG2488NC V5.X
- RUGGEDCOM RSG907R
- RUGGEDCOM RSG908C
- RUGGEDCOM RSG909R
- RUGGEDCOM RSG910C
- RUGGEDCOM RSG920P V4.X
- RUGGEDCOM RSG920P V5.X
- RUGGEDCOM RSG920PNC V4.X
- RUGGEDCOM RSG920PNC V5.X
- RUGGEDCOM RSL910
- RUGGEDCOM RSL910NC
- RUGGEDCOM RST2228
- RUGGEDCOM RST2228P
- RUGGEDCOM RST916C
- RUGGEDCOM RST916P
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Privileged attacker steals administrator credentials, gains full control of industrial network devices, and potentially disrupts critical infrastructure operations.
Likely Case
Privileged attacker steals session cookies or sensitive configuration data, leading to unauthorized access and potential device manipulation.
If Mitigated
Attack limited to information disclosure without ability to execute commands or modify configurations.
🎯 Exploit Status
Exploitation requires privileged access to the web interface. Once access is obtained, XSS payload injection is straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Siemens advisory for specific firmware updates
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-256353.html
Restart Required: Yes
Instructions:
1. Identify affected RUGGEDCOM devices
2. Check Siemens advisory SSA-256353 for specific firmware updates
3. Download appropriate firmware from Siemens support portal
4. Backup device configuration
5. Apply firmware update following vendor instructions
6. Restart device
7. Verify update and restore configuration
🔧 Temporary Workarounds
Disable Web Interface
allDisable web management interface if not required for operations
Consult device documentation for web interface disable commands
Network Segmentation
allRestrict access to web interface using network controls
Configure firewall rules to limit access to trusted IPs only
🧯 If You Can't Patch
- Implement strict network segmentation to isolate RUGGEDCOM devices
- Use application firewalls with XSS protection rules
- Monitor for suspicious web interface activity
- Implement strong authentication and session management controls
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against affected versions listed in Siemens advisory SSA-256353Check Version:
Check device web interface or CLI for firmware version (varies by model)Verify Fix Applied:
Verify firmware version has been updated to patched version specified in Siemens advisory📡 Detection & Monitoring
Log Indicators:
- Unusual web interface access patterns
- Multiple failed login attempts followed by successful access
- Suspicious JavaScript or HTML payloads in web logs
Network Indicators:
- Unusual traffic to web management ports (typically 80/443)
- Requests containing XSS payload patterns
SIEM Query:
source="RUGGEDCOM" AND (http_request CONTAINS "<script>" OR http_request CONTAINS "javascript:" OR http_request CONTAINS "onerror=" OR http_request CONTAINS "onload=")