CVE-2025-27495
📋 TL;DR
This critical SQL injection vulnerability in TeleControl Server Basic allows unauthenticated remote attackers to bypass authorization, read/write to the database, and execute code with NetworkService permissions. All versions before V3.1.2.2 are affected. Attackers only need network access to port 8000 on vulnerable systems.
💻 Affected Systems
- TeleControl Server Basic
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution as NetworkService, enabling lateral movement, data theft, and persistent backdoor installation.
Likely Case
Database compromise leading to data exfiltration, configuration manipulation, and potential denial of service.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts.
🎯 Exploit Status
SQL injection via CreateTrace method requires no authentication. ZDI-CAN-25911 reference suggests active research.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.1.2.2
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-443402.html
Restart Required: Yes
Instructions:
1. Download V3.1.2.2 from Siemens portal. 2. Backup configuration and data. 3. Install update. 4. Restart service/application. 5. Verify version.
🔧 Temporary Workarounds
Network Access Restriction
windowsBlock external access to port 8000 using firewall rules
netsh advfirewall firewall add rule name="Block TeleControl Port" dir=in action=block protocol=TCP localport=8000
Application Firewall Rules
windowsRestrict access to TeleControl Server to trusted IPs only
netsh advfirewall firewall add rule name="Allow TeleControl Trusted" dir=in action=allow protocol=TCP localport=8000 remoteip=192.168.1.0/24
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeleControl Server from untrusted networks
- Deploy web application firewall (WAF) with SQL injection rules in front of port 8000
🔍 How to Verify
Check if Vulnerable:
Check TeleControl Server Basic version in application interface or registry: HKEY_LOCAL_MACHINE\SOFTWARE\Siemens\TeleControl Server Basic\VersionCheck Version:
reg query "HKLM\SOFTWARE\Siemens\TeleControl Server Basic" /v VersionVerify Fix Applied:
Confirm version is V3.1.2.2 or higher in application interface or registry📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed authentication attempts followed by successful access
- Unexpected database operations
Network Indicators:
- SQL injection patterns in traffic to port 8000
- Unusual outbound connections from TeleControl Server
SIEM Query:
source="telecontrol.log" AND ("CreateTrace" OR "SQL" OR "injection")