Overview
The cybersecurity landscape is riddled with potential threats and vulnerabilities, one of which is CVE-2025-6370. This critical vulnerability, found in D-Link DIR-619L 2.06B01, affects the function formWlanGuestSetup of the file /goform/formWlanGuestSetup. The manipulation of the argument curTime can lead to a stack-based buffer overflow, which can be exploited remotely. This vulnerability is particularly concerning as it impacts products that are no longer supported by their maintainer and the exploit has been publicly disclosed. The potential consequences of this vulnerability are severe, including possible system compromise and data leakage.
Vulnerability Summary
CVE ID: CVE-2025-6370
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
D-Link DIR-619L | 2.06B01
How the Exploit Works
The vulnerability lies in the formWlanGuestSetup function of the /goform/formWlanGuestSetup file in D-Link DIR-619L 2.06B01. Attackers can exploit this vulnerability by manipulating the curTime argument which can lead to a stack-based buffer overflow. This overflow can overwrite other data structures, potentially leading to arbitrary code execution, system compromise, or data leakage. Since this vulnerability affects products that are no longer supported by their maintainer, it poses a significant risk to users of these legacy products.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited using a HTTP request:
POST /goform/formWlanGuestSetup HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
curTime=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...In the above example, the curTime argument is filled with a large number of ‘A’ characters, which can potentially cause a buffer overflow in the formWlanGuestSetup function.
Mitigation
Given the severity of this vulnerability, it is strongly recommended that users apply the vendor patch, if available. If a patch is not available, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as temporary mitigation. These systems can detect and block attempts to exploit this vulnerability, providing a layer of protection for the affected systems. However, these are only temporary measures and cannot fully eliminate the risk. Long-term mitigation strategies should include replacing or upgrading unsupported products to versions that are not vulnerable to this exploit.