Thanks for your reply.
The problem is that scripts placed in the subdomain's cgi-bin are run by the webserver under its own user id (user: nobody). Since this is different from the user id of the owner of the
website hosting and in a different group if any of the scripts need to write to the filesystem the directories written to must be world writable. The simple CGI wrapper wraps scripts so that they run under the user id of the
website hosting owner, not of the webserver. This way directories that are written to need only be user writable, not world writable.