CVE-2025-27540
📋 TL;DR
An unauthenticated SQL injection vulnerability in TeleControl Server Basic allows remote attackers to bypass authentication, read/write to the database, and execute code with NetworkService permissions. This affects all versions before V3.1.2.2. Attackers need access to port 8000 on systems running vulnerable versions.
💻 Affected Systems
- TeleControl Server Basic
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution as NT AUTHORITY\NetworkService, leading to data theft, lateral movement, and potential ransomware deployment.
Likely Case
Database compromise leading to credential theft, data manipulation, and privilege escalation within the affected system.
If Mitigated
Limited impact with proper network segmentation and authentication controls preventing access to vulnerable service.
🎯 Exploit Status
SQL injection via 'Authenticate' method is straightforward for attackers with basic SQLi knowledge.
🛠️ 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 support portal. 2. Backup configuration and data. 3. Stop TeleControl Server Basic service. 4. Install update. 5. Restart service and verify functionality.
🔧 Temporary Workarounds
Network Access Control
windowsRestrict access to port 8000/TCP using firewall rules
Windows Firewall: New-NetFirewallRule -DisplayName "Block TeleControl Port" -Direction Inbound -LocalPort 8000 -Protocol TCP -Action Block
Service Disablement
windowsTemporarily disable TeleControl Server Basic service if not required
sc config "TeleControl Server Basic" start= disabled
sc stop "TeleControl Server Basic"
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeleControl Server systems from critical assets
- Deploy web application firewall with SQL injection protection rules in front of service
🔍 How to Verify
Check if Vulnerable:
Check TeleControl Server Basic version in Control Panel > Programs and Features or via registry: HKEY_LOCAL_MACHINE\SOFTWARE\Siemens\TeleControl Server Basic\VersionCheck Version:
reg query "HKLM\SOFTWARE\Siemens\TeleControl Server Basic" /v VersionVerify Fix Applied:
Verify installed version is V3.1.2.2 or higher using same methods as above📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Failed authentication attempts with SQL syntax
- NetworkService account performing unexpected actions
Network Indicators:
- SQL injection patterns in traffic to port 8000
- Unusual outbound connections from TeleControl Server system
SIEM Query:
source="TeleControl*" AND ("sql" OR "union" OR "select" OR "insert" OR "update" OR "delete")