Tenda AC5 Stack-Based Buffer Overflow Vulnerability in OpenSchedWifi Functionality

A critical stack-based buffer overflow vulnerability has been identified in the Tenda AC5 router running firmware version 15.03.06.47. The issue arises in the '/goform/openSchedWifi' file, where the 'schedStartTime' and 'schedEndTime' parameters can be manipulated, leading to a buffer overflow condition. This vulnerability can be exploited remotely, and a public exploit is available.

Impact

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

Reproduction

The vulnerability can be reproduced by sending a POST request to the '/goform/openSchedWifi' endpoint with crafted 'schedStartTime' or 'schedEndTime' parameters that exceed the buffer capacity. This can be done using a variety of tools that allow for HTTP request manipulation, such as curl or Postman.