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Re: Messenger service abuse (from inside the network)
From: Brad Arlt <arlt () cpsc ucalgary ca>
Date: Wed, 3 Dec 2003 16:23:15 -0700

On Wed, Dec 03, 2003 at 09:58:11PM +0200, Alexander Lukyanenko wrote:
The problem is that the users abuse the Messenger service by sending
some mischief over the network (furthermore, they even write batch
files that repeatedly flood the domain with same text).

Ahh... I remember doing the same thing in high school. Fond memories
of mischief...

You could use a network monitor or sniffer to tell which IP sent the
message.  Then you can use the IP to co-relate with users, and smack
them around later. It doesn't stop this from happening, but it might
provide accountablity.

This could be really difficult to pull off with any credability with
one common account.

You might consider installing another software to accomplish the
messaging, rather than using the default software.  You could then
disable the default messaging.

And if your users don't have Administrator you could use the packet
filter in XP/2K to only deny messages not from your admin server (or
where ever you decide to send messages from).  But I don't know if the
default packet filter in XP/2K is flexable enough to handle such a
task.
-----------------------------------------------------------------------
   __o          Bradley Arlt                    Security Team Lead
 _ \<_          arlt () cpsc ucalgary ca                University Of Calgary
(_)/(_)         Joyously Canadian               Computer Science

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