Tenda F453 Buffer Overflow Vulnerability in httpd Component

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 fromAdvSetWan function of the /goform/AdvSetWan file. The vulnerability is triggered by manipulating the wanmode and PPPOEPassword parameters, allowing for remote exploitation.

Impact

Exploitation of this vulnerability leads to a buffer overflow, which can commonly result in arbitrary code execution or causing a denial-of-service condition.

Reproduction

The vulnerability can be reproduced by sending a POST request to the /goform/AdvSetWan endpoint. The request must include the wanmode parameter set to 2, along with a crafted PPPOEPassword value that exceeds the buffer's capacity. This can be done using a standard web browser or a tool like curl, ensuring that the Content-Length header reflects the size of the payload.