Tenda WH450 Stack-Based Buffer Overflow Vulnerability in PPTPDClient HTTP Request Handler

A stack-based buffer overflow vulnerability has been identified in the Tenda WH450 router, specifically in the firmware version 1.0.0.18. The issue arises within the HTTP request handler for the '/goform/PPTPDClient' endpoint. This vulnerability can be exploited remotely by unauthenticated attackers, potentially leading to arbitrary code execution or causing a denial-of-service condition. The buffer overflow is triggered by manipulating the 'username' parameter with excessively long input.

Impact

Exploitation of this vulnerability allows for arbitrary code execution or the introduction of a denial-of-service condition on the affected device.

Reproduction

The vulnerability can be reproduced by sending a GET request to the '/goform/PPTPDClient' endpoint with the 'username' parameter filled with 240 characters of 'A'. This request can be sent using a Python script that logs into the router and then sends the payload as part of the HTTP request.