Rights for proxy imaging

It APPEARS as if a basic installation of ZENworks will allow any workstation
booted with the Linux engine (off PXE or CD/DVD) will allow that station to
create an image and place it on the Imaging Proxy server in whatever
folder/filename specified in "img makep ..." In other word, if someone
knows the IP address of the box running IMGSERV, then there doesn't appear
to be any security as to what systems can place images, where they are
placed and/or how big they can be (since the Linux Engine doesn't ever
officially "log in" to the network)...

If this has been discussed/resolved elsewhere, could someone direct me to
it? A few attempts at searching yielded nothing, and I'm hoping there are
ways to secure this...

Thank you

brian