access local device from within remotely/VRDP displayed virtualbox guest

I have a Linux host running several virtualbox guests which I can access via VRDP from any remote host. I try to find out how I can use USB- or HD-drives running on the REMOTE host in question from within that VRDP-vbox-guest.
I do NOT need access to one of the Linux host drives, so this may be something to be achieved with the RDP-client used on the REMOTE host (mstsc.exe on Windows, rdesktop/krdc/… on Linux, …)

Any idea would be highly appreciated, thank you!