CVE-2024-56835
📋 TL;DR
A code injection vulnerability in the DHCP Server configuration file of Siemens RUGGEDCOM ROX devices allows attackers to execute arbitrary code. This could lead to reverse shell access with root privileges on affected systems. All versions below V2.17.0 of multiple RUGGEDCOM ROX models are vulnerable.
💻 Affected Systems
- RUGGEDCOM ROX MX5000
- RUGGEDCOM ROX MX5000RE
- 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
Complete system compromise with root-level access, enabling persistent backdoors, data exfiltration, and lateral movement within industrial networks.
Likely Case
Unauthorized remote code execution leading to device takeover, network disruption, and potential manipulation of industrial control systems.
If Mitigated
Limited impact if network segmentation prevents access to vulnerable DHCP services and proper monitoring detects exploitation attempts.
🎯 Exploit Status
Vulnerability involves code injection (CWE-74) in DHCP configuration parsing. Attackers can craft malicious DHCP requests to trigger exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V2.17.0
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-912274.html
Restart Required: Yes
Instructions:
1. Download firmware V2.17.0 from Siemens support portal. 2. Backup current configuration. 3. Upload and install firmware update via web interface or CLI. 4. Reboot device. 5. Verify version is V2.17.0 or higher.
🔧 Temporary Workarounds
Disable DHCP Server
linuxIf DHCP functionality is not required, disable the DHCP Server service to eliminate attack surface.
systemctl stop dhcpd
systemctl disable dhcpd
Network Segmentation
linuxRestrict network access to DHCP service ports (UDP 67/68) using firewall rules.
iptables -A INPUT -p udp --dport 67 -j DROP
iptables -A INPUT -p udp --dport 68 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable devices from untrusted networks.
- Deploy intrusion detection systems to monitor for DHCP exploitation attempts and anomalous network traffic.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or CLI. If version is below V2.17.0 and DHCP Server is enabled, device is vulnerable.Check Version:
cat /etc/version | grep FirmwareVerify Fix Applied:
Confirm firmware version is V2.17.0 or higher and test DHCP functionality remains operational without security issues.📡 Detection & Monitoring
Log Indicators:
- Unusual DHCP request patterns
- Unexpected process execution from DHCP service
- System logs showing code execution errors
Network Indicators:
- Malformed DHCP packets with embedded code
- Unexpected outbound connections from device following DHCP requests
SIEM Query:
source="dhcpd.log" AND (message="*exec*" OR message="*injection*" OR message="*malformed*")