Overview
A critical vulnerability has been discovered in the D-Link DIR-619L 2.06B01, an older yet widely used router. This vulnerability, identified as CVE-2025-6115, lies in the form_macfilter function and can lead to a stack-based buffer overflow. The vulnerability is of particular concern because it can be exploited remotely and may lead to severe consequences such as system compromise or data leakage. This vulnerability is critical due to its potential for widespread harm and the ease with which it can be exploited.
Vulnerability Summary
CVE ID: CVE-2025-6115
Severity: Critical (8.8 CVSS)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, potential data leakage
Affected Products
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Product | Affected Versions
D-Link DIR-619L | 2.06B01
How the Exploit Works
The vulnerability in the D-Link DIR-619L 2.06B01 router is related to the form_macfilter function. The manipulation of the argument mac_hostname_%d/sched_name_%d can lead to a stack-based buffer overflow. This kind of overflow happens when a program writes more data to the buffer than it can handle, which can cause it to overwrite adjacent memory locations. A remote attacker could use this vulnerability to inject arbitrary code into the memory, which would then be executed whenever the compromised function is called.
Conceptual Example Code
In a conceptual sense, an attacker might exploit this vulnerability by sending a specially crafted HTTP request to the vulnerable router. This request might look something like this:
POST /form_macfilter HTTP/1.1
Host: vulnerable.router.ip
Content-Type: application/x-www-form-urlencoded
mac_hostname_%d=some_valid_value&sched_name_%d=AAAA...AAAA (long string of 'A's to cause buffer overflow)In this example, the `sched_name_%d` parameter is filled with a long string of ‘A’s. This string is longer than the buffer can handle, causing it to overflow and allowing the attacker to inject and execute arbitrary code.
Remediation
Given that the affected product is no longer supported by the vendor, the best course of action is to replace the affected routers with newer models that are not vulnerable to this exploit. However, as an interim measure, a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can be used to monitor for and block malicious traffic attempting to exploit this vulnerability.