RE: Messenger service abuse (from inside the network)

["Shawn Jackson" <sjackson () horizonusa com>]

        One account for all those students...*wimper*. You just angered
the Audit gods! I assume they are using the net command for it:

        net SEND /DOMAIN:YOURDOMAIN I-Hax0r-U

        Just ACL the net command to SYSTEM, DOMAIN ADMINS, etc. Make
sure you got everything locked down on the system (gpedit.msc). Also
make sure they aren't installing any software for messenger spamming.

Shawn Jackson
Systems Administrator
Horizon USA
1190 Trademark Dr #107
Reno NV 89521
www.horizonusa.com
 
Email: sjackson () horizonusa com
Phone: (775) 858-2338
       (800) 325-1199 x338

-----Original Message-----
From: Alexander Lukyanenko [mailto:sashman () ua fm] 
Sent: Wednesday, December 03, 2003 11:58 AM
To: security-basics () securityfocus com
Subject: Messenger service abuse (from inside the network)

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Hello list.
I administer a high school network running W2K Pro in an Active
Directory domain.

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).
Is there a way to prevent this, except by changing net.exe's
ACL on all machines (or beating the offenders after classes :)?
Stopping Messenger service on the workstations is not a solution, as it
is used for sending various administrative messages.
All students share a common AD account (it would be cumbersome to
maintain 300+ user accounts, as most of them use the PCs for short
periods only).

Best regards
* * * * * * * * * * * * * * *
* Alexander V. Lukyanenko   *
* ma1lt0: sashman ua fm     *
* ICQ#  : 86195208          *
* Phone : +380 44 458 07 23 *
* OpenPGP key ID: 75EC057C  *
* NIC   : SASH4-UANIC       *
* * * * * * * * * * * * * * *
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