CVE-2025-40765
📋 TL;DR
An information disclosure vulnerability in TeleControl Server Basic V3.1 allows unauthenticated remote attackers to obtain password hashes and use them to authenticate to the database service. This affects all versions from V3.1.2.2 up to but not including V3.1.2.3. Attackers can perform authenticated database operations after successful exploitation.
💻 Affected Systems
- TeleControl Server Basic V3.1
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the TeleControl Server database, allowing attackers to modify or delete critical industrial control system data, potentially disrupting operations.
Likely Case
Unauthorized access to sensitive industrial control data, potential data theft, and manipulation of operational parameters.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to vulnerable systems.
🎯 Exploit Status
The vulnerability description suggests straightforward exploitation requiring no authentication. No public exploit code is currently known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V3.1.2.3 or later
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-062309.html
Restart Required: Yes
Instructions:
1. Download V3.1.2.3 or later from Siemens support portal. 2. Backup current configuration and data. 3. Install the update following Siemens installation guide. 4. Restart the TeleControl Server service.
🔧 Temporary Workarounds
Network Segmentation
allIsolate TeleControl Server from untrusted networks and restrict access to trusted IPs only.
Use firewall rules to block all external access to TeleControl Server ports
Implement VLAN segmentation
Access Control Lists
windowsRestrict network access to TeleControl Server to only authorized management systems.
Configure Windows Firewall or network firewall to allow only specific source IPs
🧯 If You Can't Patch
- Immediately isolate the system from all untrusted networks including internet
- Implement strict network access controls allowing only essential communications from trusted sources
🔍 How to Verify
Check if Vulnerable:
Check TeleControl Server version in the application interface or installation directory. If version is between V3.1.2.2 and V3.1.2.3 (exclusive), it is vulnerable.Check Version:
Check the version displayed in TeleControl Server GUI or examine the installation directory for version information.Verify Fix Applied:
Verify the installed version is V3.1.2.3 or later in the application interface.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts to TeleControl Server
- Database access from unexpected IP addresses
- Failed login attempts followed by successful logins
Network Indicators:
- Unusual network traffic to TeleControl Server ports from external IPs
- Database queries from unauthorized sources
SIEM Query:
source="TeleControl Server" AND (event_type="authentication" OR event_type="database_access") AND src_ip NOT IN [trusted_ips]