{"id":37723,"date":"2025-05-13T06:28:27","date_gmt":"2025-05-13T06:28:27","guid":{"rendered":""},"modified":"2025-09-16T07:08:59","modified_gmt":"2025-09-16T13:08:59","slug":"cve-2025-4348-critical-buffer-overflow-vulnerability-in-d-link-dir-600l","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4348-critical-buffer-overflow-vulnerability-in-d-link-dir-600l\/","title":{"rendered":"CVE-2025-4348: Critical Buffer Overflow Vulnerability in D-Link DIR-600L<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

A critical security vulnerability, CVE-2025-4348, has been identified in D-Link DIR-600L up to version 2.07B01. This vulnerability has been rated as critical, with a CVSS Severity Score of 8.8, indicating a significant risk to system security. The vulnerability arises from a buffer overflow<\/a> condition in the function formSetWanL2TP, triggered by the manipulation of the ‘host’ argument. This vulnerability can be exploited remotely, potentially leading to a system<\/a> compromise or data leakage. Importantly, this vulnerability only affects products that are no longer supported by D-Link<\/a>, making mitigation more challenging.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-4348
\nSeverity: Critical (CVSS: 8.8)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise and potential<\/a> data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

D-Link DIR-600L<\/a> | Up to 2.07B01<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit works by sending a specially crafted request to the formSetWanL2TP function in the D-Link DIR-600L. This function, which handles the ‘host’ argument in the application, does not properly validate or sanitize the input<\/a>. As a result, an attacker can overflow the buffer<\/a> by sending an excessively long string in the ‘host’ argument, leading to memory corruption. This can cause the application to crash or potentially allow the execution of arbitrary code<\/a>.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here is a conceptual example of how a malicious HTTP request<\/a> might look like:<\/p>\n

POST \/formSetWanL2TP HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ \"host\": \"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...[continue A's to overflow buffer]... }<\/code><\/pre>\n
In this example, the ‘host’ argument is filled with an excessive number of ‘A’ characters, causing a buffer overflow<\/a>.<\/p>\n
Mitigation<\/strong><\/p>\n
The primary form of mitigation is to apply the vendor patch. However, since the affected product is no longer supported by the vendor, this may not be possible. In such cases, users can use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and block attempts to exploit this vulnerability<\/a>. These systems can be configured<\/a> to monitor for excessively long ‘host’ arguments and block or alert on such attempts. However, these are temporary mitigation measures, and users are encouraged to upgrade to a supported product as soon as possible.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview A critical security vulnerability, CVE-2025-4348, has been identified in D-Link DIR-600L up to version 2.07B01. This vulnerability has been rated as critical, with a CVSS Severity Score of 8.8, indicating a significant risk to system security. The vulnerability arises from a buffer overflow condition in the function formSetWanL2TP, triggered by the manipulation of the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-37723","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t