Tenda AC5 Stack-Based Buffer Overflow Vulnerability in SetSysTimeCfg 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/SetSysTimeCfg' file, where the 'time' and 'timeZone' parameters can be manipulated, leading to the overflow. This vulnerability can be exploited remotely, and a public proof-of-concept exploit is available.

Impact

Exploitation of this vulnerability leads to a stack-based buffer overflow, which can commonly result in arbitrary code execution or causing the device to crash.

Reproduction

The vulnerability can be reproduced by sending a POST request to the '/goform/SetSysTimeCfg' endpoint with crafted 'time' or 'timeZone' parameters that exceed the buffer capacity, causing a stack-based overflow.