Tenda WH450 Stack-Based Buffer Overflow Vulnerability in 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/PPTPClient' 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 'netmsk' parameter with excessively long input.

Impact

Exploitation of this vulnerability allows for a stack-based buffer overflow, which could be leveraged to execute arbitrary code or cause a denial-of-service condition on the device.

Reproduction

The vulnerability can be reproduced by sending a GET request to the '/goform/PPTPClient' endpoint with the 'netmsk' parameter filled with a string that exceeds 200 bytes. This can be done using a script that logs into the router and then sends the payload as part of the HTTP request.