Overview
In the ever-evolving landscape of cybersecurity, a critical vulnerability, CVE-2025-6328, has been discovered in the D-Link DIR-815 router version 1.01. This vulnerability has been identified as a stack-based buffer overflow, which can be exploited remotely, potentially leading to a system compromise or data leakage. Being a widely used router, this vulnerability poses a significant threat to many users and organizations that rely on the D-Link DIR-815 for their network connectivity.
Vulnerability Summary
CVE ID: CVE-2025-6328
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 DIR-815 | 1.01
How the Exploit Works
This vulnerability stems from a flaw within the sub_403794 function of the hedwig.cgi file in D-Link DIR-815 version 1.01. By manipulating this function, an attacker can cause a stack-based buffer overflow, which is a more dangerous class of buffer overflow attacks that can overwrite the control data of a function. This could lead to the execution of arbitrary code, potentially allowing an attacker to gain control over the system. A successful exploit would be initiated remotely, requiring no user interaction or elevated privileges.
Conceptual Example Code
While an exact exploitation method has not been disclosed, a conceptual example of exploitation might involve sending a specially crafted HTTP request to the vulnerable router. This could look something like:
POST /hedwig.cgi HTTP/1.1
Host: <target router IP>
Content-Type: application/x-www-form-urlencoded
data=<overly long string causing stack overflow>In this hypothetical exploit, an attacker would send an overly long string as the ‘data’ parameter to the hedwig.cgi file. This could cause the buffer to overflow, potentially allowing the attacker to execute arbitrary code or initiate other malicious activities.
Mitigation Guidance
Users are strongly advised to apply the patch released by D-Link as soon as possible. In the meantime, it is recommended to use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation method for this vulnerability. These systems can provide some degree of protection by detecting and blocking suspicious activities and traffic patterns. However, they are not foolproof and cannot completely eliminate the risk posed by this vulnerability. Therefore, the application of the vendor patch should be prioritized to ensure maximum security.