Tenda i3 Stack-Based Buffer Overflow Vulnerability in the formexeCommand Function

A stack-based buffer overflow vulnerability has been identified in the Tenda i3 router, specifically in version 1.0.0.6(2204). The issue arises in the formexeCommand function within the /goform/exeCommand file. This vulnerability can be exploited remotely by manipulating the cmdinput parameter, leading to potential unauthorized memory access and code execution.

Impact

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

Reproduction

The vulnerability can be reproduced by sending a crafted HTTP POST request to the /goform/exeCommand endpoint. The request must include an excessively long cmdinput parameter, which will overflow the buffer and potentially allow for code execution.