Overview
In the fast-paced world of cybersecurity, a new critical vulnerability, classified as CVE-2025-6373, has been discovered in D-Link DIR-619L 2.06B01. This vulnerability pertains to the function formSetWizard1 of the file /goform/formWlSiteSurvey and is categorized as a stack-based buffer overflow type. It’s important to note that the vulnerability can be exploited remotely, making it a potential threat to all users of this D-Link product.
The CVE-2025-6373 vulnerability is particularly concerning due to the fact that it affects a product that is no longer supported by the maintainer, leaving users vulnerable to attacks. This blog post aims to provide a detailed understanding of this vulnerability, its potential impact, and the necessary mitigation steps.
Vulnerability Summary
CVE ID: CVE-2025-6373
Severity: Critical, CVSS score of 8.8
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
D-Link DIR-619L | 2.06B01
How the Exploit Works
The CVE-2025-6373 exploit works by manipulating the ‘curTime’ argument in the formSetWizard1 function of the file /goform/formWlSiteSurvey. This manipulation leads to a stack-based buffer overflow. Given that the exploit can be initiated remotely, it allows attackers to execute arbitrary code on the target system, potentially leading to system compromise or data leakage.
Conceptual Example Code
Here’s a conceptual example of how an attacker might exploit this vulnerability. This might look like a malicious HTTP POST request to the /goform/formWlSiteSurvey endpoint, with a manipulated ‘curTime’ argument:
POST /goform/formWlSiteSurvey HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime= [malicious input]Note: The above is a simplified example. In a real-world scenario, the malicious input would be carefully crafted to trigger the buffer overflow.
Recommendations for Mitigation
As the D-Link DIR-619L 2.06B01 is no longer supported by the maintainer, applying a vendor patch is not an option. For users who are still using this product, the recommended mitigation step is to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. However, due to the severity of the vulnerability, it is highly recommended to replace unsupported devices with up-to-date, supported devices.