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 within the httpd component, in an unknown function of the file '/goform/setcfm'. The vulnerability is triggered by manipulating the 'funcname' and 'funcpara1' arguments, which leads to a buffer overflow. This flaw can be exploited remotely, and has been publicly disclosed along with an available exploit.

Impact

Exploitation of this vulnerability causes a stack-based buffer overflow, which can lead to arbitrary code execution or a denial-of-service condition on the device.

Reproduction

The vulnerability can be reproduced by sending a POST request to '/goform/setcfm' with a crafted 'funcname' and 'funcpara1' that exploit the buffer overflow. The 'funcpara1' should be filled with a payload that exceeds the buffer size, which can be achieved by using a large amount of repetitive data.