Is X-Windows a security hole?

[Kuruvilla Chandy]

Hi,

I have some friends who are setting up a server in their office, they plan
to run it on RedHat 5.1 and set it up for dial-in capabilities so that they
can work from home.

They told me that they don't plan to install X-Windows on the server as
they heard that it is a security risk to do so on a dial-in machine, is
this true? Is there no work-around?

thanks,
Ishaaq Chandy