Tenda AC15 Stack-Based Buffer Overflow Vulnerability in QoS Management Function

A stack-based buffer overflow vulnerability has been identified in the Tenda AC15 router running firmware version 15.03.05.18. The issue arises in the QoS management function, specifically within the file '/goform/saveAutoQos'. The vulnerability can be exploited remotely by manipulating the 'enable' parameter, leading to potential denial-of-service or arbitrary code execution.

Impact

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

Reproduction

The vulnerability can be reproduced by sending a POST request to '/goform/saveAutoQos' with an oversized 'enable' parameter. This input is not properly validated, allowing for a stack overflow when the data is copied into a fixed-size buffer. After the overflow is triggered, the '/goform/getAdvanceStatus' endpoint can be accessed to complete the exploitation process.