In order for this to work, you would need to be able to upload a cgi script with the ability to run as root. If this is actually a possibility for you, then I strongly recommend you reconsider the security precautions you are taking with your webserver. Otherwise, you are enabling any user that can find a vulnerability in your site to potentially gain root access on your server. It is much wiser to let your server run as an un-privileged user.