CVE-2023-30755
📋 TL;DR
A vulnerability in Siemens SIMATIC industrial control devices allows remote attackers with elevated privileges to cause denial of service by exploiting improper resource cleanup during shutdown/reboot requests. This affects multiple SIMATIC communication processors, HMI panels, and related industrial software. The impact is limited to availability disruption rather than data compromise.
💻 Affected Systems
- SIMATIC CP 1242-7 V2
- SIMATIC CP 1243-1
- SIMATIC CP 1243-1 DNP3
- SIMATIC CP 1243-1 IEC
- SIMATIC CP 1243-7 LTE
- SIMATIC CP 1243-8 IRC
- SIMATIC HMI Comfort Panels
- SIMATIC IPC DiagBase
- SIMATIC IPC DiagMonitor
- SIMATIC WinCC Runtime Advanced
- SIPLUS TIM 1531 IRC
- TIM 1531 IRC
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker with administrative access causes persistent denial of service, disrupting industrial operations until manual intervention or device replacement.
Likely Case
Authorized but malicious insider or compromised administrative account triggers denial of service, requiring device reboot or maintenance.
If Mitigated
With proper access controls and network segmentation, impact is limited to temporary service disruption within isolated industrial network segments.
🎯 Exploit Status
Requires existing administrative or elevated access; no authentication bypass component
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.5.20 for CP devices, V2.4.8 for TIM devices
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-423808.html
Restart Required: Yes
Instructions:
1. Download firmware updates from Siemens Industrial Online Support. 2. Follow device-specific update procedures. 3. Apply patches during maintenance windows. 4. Verify successful update via device web interface.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices in dedicated industrial network segments with strict access controls
Access Control Hardening
allRestrict web interface access to authorized personnel only using firewall rules and authentication
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices from general network traffic
- Enforce principle of least privilege for all user accounts with device access
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or diagnostic tools; compare against patched versionsCheck Version:
Device-specific; typically via web interface at http://<device-ip> or using Siemens diagnostic toolsVerify Fix Applied:
Confirm firmware version is V3.5.20 or higher for CP devices, V2.4.8 or higher for TIM devices📡 Detection & Monitoring
Log Indicators:
- Multiple shutdown/reboot requests from single source
- Unusual administrative login patterns
- Device availability alerts
Network Indicators:
- HTTP POST requests to device web interfaces with shutdown parameters
- Unusual traffic patterns to industrial device web servers
SIEM Query:
source_ip IN (industrial_device_ips) AND (http_method = 'POST' AND uri CONTAINS 'shutdown' OR uri CONTAINS 'reboot')