CVE-2023-49691
📋 TL;DR
This vulnerability allows malicious local administrators to execute arbitrary operating system commands with root privileges by exploiting improper input sanitization in the DDNS configuration handling. It affects multiple Siemens RUGGEDCOM and SCALANCE industrial networking devices running firmware versions below V8.0. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- RUGGEDCOM RM1224 LTE(4G) EU (6GK6108-4AM00-2BA2)
- RUGGEDCOM RM1224 LTE(4G) NAM (6GK6108-4AM00-2DA2)
- SCALANCE M804PB (6GK5804-0AP00-2AA2)
- SCALANCE M812-1 ADSL-Router (6GK5812-1AA00-2AA2)
- SCALANCE M812-1 ADSL-Router (6GK5812-1BA00-2AA2)
- SCALANCE M816-1 ADSL-Router (6GK5816-1AA00-2AA2)
- SCALANCE M816-1 ADSL-Router (6GK5816-1BA00-2AA2)
- SCALANCE M826-2 SHDSL-Router (6GK5826-2AB00-2AB2)
- SCALANCE M874-2 (6GK5874-2AA00-2AA2)
- SCALANCE M874-3 (6GK5874-3AA00-2AA2)
- SCALANCE M876-3 (6GK5876-3AA02-2BA2)
- SCALANCE M876-3 (ROK) (6GK5876-3AA02-2EA2)
- SCALANCE M876-4 (6GK5876-4AA10-2BA2)
- SCALANCE M876-4 (EU) (6GK5876-4AA00-2BA2)
- SCALANCE M876-4 (NAM) (6GK5876-4AA00-2DA2)
- SCALANCE MUM853-1 (EU) (6GK5853-2EA00-2DA1)
- SCALANCE MUM856-1 (EU) (6GK5856-2EA00-3DA1)
- SCALANCE MUM856-1 (RoW) (6GK5856-2EA00-3AA1)
- SCALANCE S615 EEC LAN-Router (6GK5615-0AA01-2AA2)
- SCALANCE S615 LAN-Router (6GK5615-0AA00-2AA2)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root privileges, allowing attackers to install persistent backdoors, exfiltrate sensitive data, disrupt industrial operations, or pivot to other network segments.
Likely Case
Local administrators with malicious intent could gain unauthorized root access to execute commands, potentially disrupting network connectivity or modifying device configurations.
If Mitigated
With proper access controls limiting administrative privileges to trusted personnel only, the risk is significantly reduced as exploitation requires local administrator credentials.
🎯 Exploit Status
Exploitation requires local administrator credentials and knowledge of the DDNS configuration interface. No public exploit code has been identified as of the advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V8.0 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-180704.html
Restart Required: Yes
Instructions:
1. Download firmware version V8.0 or later from Siemens Industrial Security. 2. Backup current device configuration. 3. Upload and install the new firmware via the device's web interface or management console. 4. Restart the device to apply changes. 5. Verify the firmware version after reboot.
🔧 Temporary Workarounds
Disable DDNS Configuration
allDisable Dynamic DNS configuration on affected devices to prevent exploitation of this vulnerability.
Access device web interface > Network > DDNS > Disable DDNS service
Restrict Administrative Access
allLimit administrative access to trusted personnel only and implement strong authentication controls.
Configure access control lists to restrict administrative interface access to specific IP addresses
🧯 If You Can't Patch
- Implement strict access controls to limit administrative access to trusted personnel only
- Disable DDNS functionality on all affected devices and monitor for unauthorized configuration changes
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface: System > Device Information > Firmware Version. If version is below V8.0, the device is vulnerable.Check Version:
Via web interface: Navigate to System > Device Information > Firmware VersionVerify Fix Applied:
After updating, verify firmware version shows V8.0 or later in System > Device Information > Firmware Version.📡 Detection & Monitoring
Log Indicators:
- Unusual DDNS configuration changes
- Unexpected system command execution logs
- Administrative access from unusual sources or at unusual times
Network Indicators:
- Unexpected outbound connections from affected devices
- Anomalous traffic patterns from administrative interfaces
SIEM Query:
source="industrial_router" AND (event_type="config_change" AND config_field="ddns" OR event_type="command_execution")🔗 References
- https://cert-portal.siemens.com/productcert/html/ssa-180704.html
- https://cert-portal.siemens.com/productcert/html/ssa-602936.html
- https://cert-portal.siemens.com/productcert/html/ssa-690517.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-180704.pdf
- https://cert-portal.siemens.com/productcert/html/ssa-180704.html
- https://cert-portal.siemens.com/productcert/html/ssa-602936.html
- https://cert-portal.siemens.com/productcert/html/ssa-690517.html
- https://cert-portal.siemens.com/productcert/pdf/ssa-180704.pdf
