Tenda FH451 Stack-Based Buffer Overflow Vulnerability in WrlclientSet Function

A stack-based buffer overflow vulnerability has been identified in the Tenda FH451 router, specifically in version 1.0.0.9. The issue arises in the WrlclientSet function within the file /goform/WrlclientSet. The vulnerability is triggered by manipulating the GO parameter, which is not properly validated before being passed to a function, leading to the overflow. This vulnerability can be exploited remotely, and public proof-of-concept exploit is available.

Impact

Exploitation of this vulnerability leads to a stack-based 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/WrlclientSet endpoint. The request must include a GO parameter filled with a payload that exceeds the buffer's capacity, effectively overwriting adjacent memory on the stack.