Overview
In the evolving landscape of cybersecurity, a critical vulnerability has been discovered in the D-Link DIR-619L 2.06B01. This vulnerability, identified as CVE-2025-6617, poses a significant threat to the affected devices. The vulnerability is classified as a stack-based buffer overflow and can be exploited remotely, leading to a potential system compromise or even data leakage. It’s important to note that this vulnerability only affects products that are no longer supported by the maintainer, which unfortunately means that the scope for remediation from the vendor is limited.
Vulnerability Summary
CVE ID: CVE-2025-6617
Severity: Critical (CVSS: 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
How the Exploit Works
The vulnerability resides in the function formAdvanceSetup of the file /goform/formAdvanceSetup. The manipulation of the argument webpage in this function leads to a stack-based buffer overflow. This means that an attacker can overflow the buffer with arbitrary data, which can overwrite the return address and divert the execution flow, potentially leading to remote code execution on the device.
Conceptual Example Code
In a possible exploit scenario, an attacker might send a specially crafted HTTP POST request to the vulnerable endpoint, overflowing the buffer and gaining control of the execution flow. The conceptual example might look something like this:
POST /goform/formAdvanceSetup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
webpage=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... [Add more 'A's to overflow the buffer]In this example, the ‘A’s (which in ASCII is 0x41) are used to fill up the buffer and overflow it, potentially overwriting the return address with the attacker’s desired value, leading to arbitrary code execution.
Mitigation
Given that the affected products are no longer supported by the maintainer, it is highly recommended to replace these devices with newer, supported models if possible. As a temporary mitigation, you could use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability. If a vendor patch becomes available, apply it immediately to prevent potential exploitation of this vulnerability.