Overview
A critical security vulnerability, identified as CVE-2025-6143, has been discovered in TOTOLINK EX1200T version 4.1.2cu.5232_B20210713. This vulnerability poses a significant risk to any organization that uses the affected device since it could potentially lead to system compromise or data leakage. The vulnerability affects an unknown function of the file /boafrm/formNtp of the HTTP POST Request Handler component and can be exploited remotely.
Vulnerability Summary
CVE ID: CVE-2025-6143
Severity: Critical (8.8 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK EX1200T | 4.1.2cu.5232_B20210713
How the Exploit Works
The vulnerability stems from the manipulation of the ‘submit-url’ argument which leads to buffer overflow. An attacker can send a specially crafted HTTP POST request to the vulnerable component. When this request is processed, the buffer overflow can occur. This could enable an attacker to execute arbitrary code on the system or cause the system to crash, resulting in a denial of service.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This example represents a malicious HTTP POST request targeting the vulnerable endpoint.
POST /boafrm/formNtp HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=malicious_payloadIn this example, ‘malicious_payload’ is a placeholder for the actual malicious code or data that would cause the buffer overflow.
Remember, this is a conceptual example only and may not represent the exact method used to exploit this vulnerability in real-world scenarios.
Mitigation
Users of the affected TOTOLINK EX1200T version are urged to apply the latest vendor patch as soon as possible to fix this vulnerability. In the interim, as a temporary mitigation, users can deploy a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and prevent attempts to exploit this vulnerability. However, this should not be considered a long-term solution and should only be used until the vendor patch can be applied.