Tenda F453 Buffer Overflow Vulnerability in Web Type Library Function

A buffer overflow vulnerability has been identified in the Tenda F453 router, specifically in version 1.0.0.3. The issue arises in the httpd component, within the formWebTypeLibrary function of the /goform/webtypelibrary file. The vulnerability can be exploited remotely by manipulating the webSiteId parameter, leading to potential denial-of-service conditions or arbitrary code execution.

Impact

Exploitation of this vulnerability causes a buffer overflow, which can lead to stack manipulation and potentially allow for arbitrary code execution on the device.

Reproduction

The vulnerability can be reproduced by sending a POST request to the /goform/webtypelibrary endpoint. The request must include a webSiteId parameter with a payload designed to overflow the buffer. This can be done by using a string that exceeds the buffer's capacity, taking advantage of the lack of proper length validation before the data is processed.