Tenda AC9 Stack-Based Buffer Overflow Vulnerability in Remote Web Configuration

A critical stack-based buffer overflow vulnerability has been identified in the Tenda AC9 router, specifically in the firmware version 15.03.02.13. The issue arises in the function 'formSetSafeWanWebMan' within the file '/goform/SetRemoteWebCfg', which is part of the HTTP POST Request Handler component. The vulnerability can be exploited remotely by manipulating the 'remoteIp' argument, leading to a stack-based overflow condition.

Impact

Exploitation of this vulnerability causes a stack-based buffer overflow, which can potentially be exploited to execute arbitrary code or cause a denial-of-service condition.

Reproduction

To reproduce this vulnerability, send an HTTP POST request to the '/goform/SetRemoteWebCfg' endpoint. Include a crafted 'remoteIp' parameter that exceeds the buffer capacity, targeting the 'formSetSafeWanWebMan' function. This will trigger the stack-based buffer overflow.