Overview
In the world of cybersecurity, the discovery of new vulnerabilities is a common occurrence and the critical CVE-2025-4448 vulnerability affecting D-Link DIR-619L 2.04B04 is no exception. The vulnerability, which is triggered by an argument manipulation in the function formEasySetupWizard, can lead to buffer overflow and is an alarming concern for users of D-Link DIR-619L. This has been classified as critical, meaning it can potentially lead to system compromise or data leakage. The vulnerability is especially problematic as it affects products that are no longer supported by the maintainer, hence requiring immediate attention.
Vulnerability Summary
CVE ID: CVE-2025-4448
Severity: Critical (CVSS Score: 8.8)
Attack Vector: Remote
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-619L | 2.04B04
How the Exploit Works
The critical vulnerability CVE-2025-4448 is a result of inadequate bounds checking in the formEasySetupWizard function. This function takes curTime as an argument, which under normal circumstances should have a controlled length. However, an attacker can manipulate this argument by providing an unusually long string, causing an overflow of the buffer. This overflow condition can lead to arbitrary code execution, allowing the attacker to compromise the system or leak data.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This example is a HTTP request with a malicious payload that exploits the buffer overflow condition.
POST /formEasySetupWizard HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "curTime": "A string that is long enough to cause a buffer overflow..." }Please note that this is a conceptual example and the real exploit might vary depending on the specifics of the implementation and the attacker’s intent.
Mitigation Guide
The best way to mitigate this vulnerability is to apply the patch provided by the vendor. If the vendor support is no longer available, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can provide temporary protection. These systems can help in detecting and preventing attacks that attempt to exploit this vulnerability. However, these are just temporary measures and users are advised to replace unsupported products with supported ones to ensure long-term security.