Tenda F456 Buffer Overflow Vulnerability in httpd Component

A stack-based buffer overflow vulnerability has been identified in the Tenda F456 router, specifically in version 1.0.0.5. The issue arises in the httpd component, within the formWrlExtraSet function of the /goform/WrlExtraSet file. The vulnerability is triggered by manipulating the 'Go' parameter, which is not properly validated before being passed to a function that writes to a buffer. This oversight allows for remote exploitation, potentially leading to a denial-of-service condition or arbitrary code execution.

Impact

Exploitation of this vulnerability causes a stack-based buffer overflow, which can 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 POST request to the /goform/WrlExtraSet 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.