Overview
A critical vulnerability has been discovered in D-Link DI-8100 1.0, which could potentially lead to a system compromise or data leakage. This vulnerability lies within the sprintf function of the jhttpd component, specifically in the /ddns.asp?opt=add file. The vulnerability has been assigned a severity score of 8.8 (CVSS), making it a critical concern for all users of the affected product. It is of utmost importance that necessary measures are taken to mitigate the risks associated with this vulnerability.
In this blog post, we will delve into the details of this vulnerability, understand how it works, and explore the mitigation strategies.
Vulnerability Summary
CVE ID: CVE-2025-7908
Severity: Critical, CVSS Score 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 DI-8100 | 1.0
How the Exploit Works
The vulnerability stems from the improper handling of the ‘mx’ argument in the sprintf function of the /ddns.asp?opt=add file. Specifically, by manipulating this ‘mx’ argument, an attacker can cause a stack-based buffer overflow. This could potentially allow the attacker to execute arbitrary code or disrupt the normal operation of the affected system. This attack can be launched remotely and does not require any user interaction, making it a severe threat.
Conceptual Example Code
Here’s a conceptual example of how an HTTP request exploiting this vulnerability might look like:
POST /ddns.asp?opt=add HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
mx=%s [Repeated long enough to overflow the buffer]In the above example, the ‘%s’ is repeated long enough to overflow the buffer, potentially allowing an attacker to execute arbitrary code.
Mitigation
The most effective way to mitigate this vulnerability is to apply the patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation strategy. These systems can help identify and block potential exploit attempts. However, it is highly recommended to apply the vendor patch as soon as possible to fully protect the system from this vulnerability.
Remember, staying vigilant and proactive in applying patches and updates is key in maintaining a strong security posture.