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CVE-2025-4441: Critical Buffer Overflow Vulnerability in D-Link DIR-605L 2.13B01

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Overview

The vulnerability CVE-2025-4441 involves a critical buffer overflow issue found in D-Link DIR-605L 2.13B01, threatening the security of countless systems globally. The affected function, formSetWAN_Wizard534, can be manipulated remotely via the argument curTime, leading to a potential system compromise or data leakage. This vulnerability is particularly concerning as it affects products that are no longer supported by the maintainer, leaving a multitude of systems without an immediate vendor-provided solution.

Vulnerability Summary

CVE ID: CVE-2025-4441
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

D-Link DIR-605L | 2.13B01

How the Exploit Works

The vulnerability allows remote attackers to trigger a buffer overflow condition in the formSetWAN_Wizard534 function. By sending an excessively long string in the curTime argument, the application fails to properly allocate memory, leading to an overflow condition. This can be exploited to execute arbitrary code or disrupt the normal functioning of the system.

Conceptual Example Code

Here is a conceptual example of how an attacker might exploit this vulnerability, by sending a malicious HTTP POST request with an oversized curTime argument:

POST /formSetWAN_Wizard534 HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...

In this example, the ‘A’s represent an excessively long string that could overflow the buffer when processed by the formSetWAN_Wizard534 function.

Mitigation Guidance

As the affected products are no longer supported by the maintainer, it is recommended to apply a vendor patch where available. However, if a vendor patch is not available, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These measures can monitor and potentially block malicious traffic attempting to exploit this vulnerability.

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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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