Tenda i12 Stack-Based Buffer Overflow Vulnerability in WifiMacFilterGet Function

A stack-based buffer overflow vulnerability has been identified in the Tenda i12 router, specifically in version 1.0.0.6(2204). The issue arises in the formWifiMacFilterGet function within the file /goform/WifiMacFilterGet. This vulnerability allows for remote exploitation by manipulating the 'index' parameter, leading to potential denial-of-service conditions or arbitrary code execution.

Impact

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

Reproduction

The vulnerability can be reproduced by sending a POST request to the /goform/WifiMacFilterGet endpoint. The request must include a 'wl_radio' parameter set to a value other than 0, and an 'index' parameter filled with a payload that exceeds the buffer's capacity. This unvalidated input is then processed by the sprintf function, creating the overflow condition.