CVE-2025-32834: Exploiting TeleControl Server Basic via SQL Injection

Overview

This blog post aims to explain and discuss the critical vulnerability CVE-2025-32834. The affected software, TeleControl Server Basic, an application used in a variety of systems, is found to be susceptible to SQL injection attacks. The vulnerability could allow an authenticated attacker to bypass authorization controls, retrieve sensitive data, write to the application’s database, and execute code with “NT AUTHORITYNetworkService” permissions. It is crucial to understand this vulnerability due to its potential to lead to system compromise and data leakage if not adequately addressed.

Vulnerability Summary

CVE ID: CVE-2025-32834
Severity: High (8.8)
Attack Vector: Network
Privileges Required: Low (Authenticated user)
User Interaction: None
Impact: Bypass of authorization controls, potential data leakage, and system compromise

Affected Products

Product | Affected Versions

TeleControl Server Basic | All versions < V3.1.2.2 How the Exploit Works

The vulnerability arises from the ‘UpdateConnectionVariablesWithImport’ method used internally by the TeleControl Server Basic application. This method is vulnerable to SQL injection attacks, which means that an attacker can inject SQL commands that can manipulate the application’s database directly. This can lead to unauthorized reading of data, data modification, and code execution.

Conceptual Example Code

Here’s a conceptual example of how the vulnerability might be exploited:

POST /UpdateConnectionVariablesWithImport HTTP/1.1
Host: target.example.com:8000
Content-Type: application/sql
{ "query": "'; DROP TABLE Users;--" }

In this example, the malicious SQL command `’; DROP TABLE Users;–` is injected into the ‘UpdateConnectionVariablesWithImport’ endpoint, which can cause the ‘Users’ table in the database to be deleted if successfully exploited.

Mitigation

The immediate mitigation to this vulnerability is to apply the vendor patch. Upgrading to version V3.1.2.2 of TeleControl Server Basic resolves the vulnerability. As a temporary measure, the use of Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can help to detect and block SQL injection attacks.
Always remember that updating and patching your software regularly is the most effective way to protect your systems from vulnerabilities like CVE-2025-32834.