CVE-2021-37174
📋 TL;DR
This privilege escalation vulnerability in Siemens RUGGEDCOM ROX industrial routers allows attackers to gain root access on affected devices. It affects multiple RUGGEDCOM ROX models running firmware versions below V2.14.1. Organizations using these industrial networking devices in critical infrastructure are particularly at risk.
💻 Affected Systems
- RUGGEDCOM ROX MX5000
- RUGGEDCOM ROX RX1400
- RUGGEDCOM ROX RX1500
- RUGGEDCOM ROX RX1501
- RUGGEDCOM ROX RX1510
- RUGGEDCOM ROX RX1511
- RUGGEDCOM ROX RX1512
- RUGGEDCOM ROX RX1524
- RUGGEDCOM ROX RX1536
- RUGGEDCOM ROX RX5000
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full root control of industrial router, potentially disrupting critical infrastructure operations, intercepting/modifying industrial network traffic, or using device as pivot point into OT networks.
Likely Case
Privileged attacker with initial access escalates to root, enabling persistence, credential theft, and lateral movement within industrial control systems.
If Mitigated
With proper network segmentation and access controls, impact limited to isolated device requiring physical or network access for exploitation.
🎯 Exploit Status
Requires initial access to device (authenticated user). CWE-250 indicates execution with unnecessary privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V2.14.1
Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-150692.pdf
Restart Required: Yes
Instructions:
1. Download firmware V2.14.1 from Siemens support portal. 2. Backup current configuration. 3. Upload and install new firmware via web interface or CLI. 4. Reboot device. 5. Verify firmware version post-update.
🔧 Temporary Workarounds
Restrict administrative access
allLimit administrative access to trusted networks and implement strict access controls
Network segmentation
allIsolate RUGGEDCOM devices in separate network segments with firewall rules
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach administrative interfaces
- Monitor for unusual administrative activity and privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface (System > About) or CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Confirm firmware version is V2.14.1 or higher using same methods📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Multiple failed then successful authentication attempts
- Root user activity from non-standard accounts
Network Indicators:
- Unusual administrative traffic patterns
- Connections to device from unexpected sources
SIEM Query:
source="rugcom*" AND (event_type="privilege_escalation" OR user="root" AND source_user!="root")