Totolink A8000RU Command Injection Vulnerability in Web Management Interface

A command injection vulnerability has been identified in the Totolink A8000RU router, specifically in version 7.1cu.643_b20200521. The issue arises within the Web Management Interface, in the 'setWiFiAdvancedCfg' function of the '/cgi-bin/cstecgi.cgi' file. The vulnerability allows remote attackers to execute arbitrary operating system commands by manipulating the 'bgProtection' argument in a crafted request.

Impact

Exploitation of this vulnerability allows for arbitrary command execution on the affected device.

Reproduction

To reproduce this vulnerability, send a POST request to '/cgi-bin/cstecgi.cgi' with the 'bgProtection' parameter set to a command, such as 'ls>./setWiFiAdvancedCfg.txt'. The router will execute the command and create a text file with the command's output.