Overview
The CVE-2025-3989 vulnerability is a critical security flaw identified in the TOTOLINK N150RT 3.4.0-B20190525. This vulnerability affects an unspecified function related to the /boafrm/formStaticDHCP file. The exploitation of this vulnerability could lead to serious implications such as system compromise or data leakage. It is particularly concerning because the vulnerability can be manipulated remotely, widening the potential attack surface. Given the public disclosure of the exploit, immediate attention and mitigation are necessary to prevent the potential exploitation of the vulnerability.
Vulnerability Summary
CVE ID: CVE-2025-3989
Severity: Critical (8.8 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Buffer overflow leading to potential system compromise or data leakage
Affected Products
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Product | Affected Versions
TOTOLINK N150RT | 3.4.0-B20190525
How the Exploit Works
The CVE-2025-3989 vulnerability is a buffer overflow issue that is triggered when manipulating the ‘Hostname’ argument in the /boafrm/formStaticDHCP file. An attacker can craft a malicious request with an overlong Hostname value, causing the buffer to overflow. This overflow can lead to unintended code execution, which an attacker can exploit to compromise the system or leak data.
Conceptual Example Code
Below is a conceptual example of how the vulnerability could be exploited. The attacker sends a POST request with an excessively long ‘Hostname’ value to the target router.
POST /boafrm/formStaticDHCP HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
Hostname=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In the above request, ‘A’ is used to represent arbitrary data that fills the buffer beyond its capacity, triggering the overflow.
Mitigation Measures
To mitigate this critical vulnerability, users are advised to apply the vendor-supplied patch as soon as it becomes available. In the meantime, employing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help detect and prevent potential exploitation. Regular monitoring of network traffic and system logs can also aid in early detection of any suspicious activities.