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CVE-2025-3992: Remote Buffer Overflow Vulnerability in TOTOLINK N150RT

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Overview

A critical vulnerability, CVE-2025-3992, has been identified in TOTOLINK N150RT 3.4.0-B20190525. This vulnerability allows remote attackers to initiate a buffer overflow attack, potentially leading to a system compromise or data leakage. As the exploit has been publicly disclosed, unpatched systems are at high risk. This post aims to provide a detailed understanding of this vulnerability, its potential impact, and the necessary mitigation steps to prevent exploits.

Vulnerability Summary

CVE ID: CVE-2025-3992
Severity: Critical (CVSS 8.8)
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 N150RT | 3.4.0-B20190525

How the Exploit Works

The vulnerability lies in the unknown code of the file /boafrm/formWlwds in TOTOLINK N150RT. The flaw arises from the improper handling of the argument ‘submit-url. An attacker can manipulate this argument to cause a buffer overflow. A buffer overflow occurs when more data is put into a buffer than it can handle, causing an overflow of data into adjacent memory spaces. This is a dangerous scenario as it can lead to arbitrary code execution, allowing an attacker to take control of the system or leak sensitive data.

Conceptual Example Code

A conceptual example of exploiting this vulnerability might look like the following HTTP request. This request manipulates the ‘submit-url’ argument with a malicious payload that triggers the buffer overflow:

POST /boafrm/formWlwds HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
submit-url=...[malicious_payload]...

The ‘malicious_payload’ here would be designed to overflow the buffer and execute arbitrary code or exfiltrate data.

Mitigation Guidance

To remediate this vulnerability, the recommended course of action is to apply a vendor patch. This will fix the flaw in the affected software and prevent any future exploits. In case a patch is not immediately available or cannot be applied promptly, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These measures can monitor and block suspicious activities, thus providing some level of protection against the exploit.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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