ToToLink A3300R Command Injection Vulnerability in cgi-bin/cstecgi.cgi

A command injection vulnerability has been identified in ToToLink A3300R firmware version 17.0.0cu.557_B20221024. The issue arises in the cgi-bin/cstecgi.cgi script, where the stun_user parameter can be manipulated to execute arbitrary commands on the device.

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 stun_user parameter set to a crafted value that includes a command, such as a wget command to download a file from a remote server. The request must include the appropriate headers and payload to mimic a legitimate XMLHttpRequest.