RE: Messenger service abuse (from inside the network)

From: Zachary Mutrux (
Date: 12/05/03

  • Next message: Tres London: "RE: WiFi security implications"
    To: "Security-Basics" <>
    Date: Fri, 5 Dec 2003 09:12:48 -0800

    Like Shawn said, use NTFS permissions to deny access to the net.exe program,
    to anyone but system and whatever groups should have authorized access. No
    need to visit each computer individually, these settings can be assigned via
    group policy.

    However, this won't stop someone from bringing his own copy of net.exe in on
    a floppy or downloaded from the Internet.

    Does anyone know of a good replacement for the Messenger service? I would be
    particularly interested in a cross-platform (Mac/PC) solution. Or something
    that will let the Mac receive notes sent via the Messenger service. Maybe
    that should be a separate thread.

    If the students' computers aren't already on their own separate network,
    that might be a place to start. Then their Messenger hijinks won't affect
    computers used by teachers and administration.

    I like the idea of being able to block messenger traffic with a packet
    filter, but where would this be implemented? Not on the firewall, not on the
    server. It would have to be implemented on all the workstations. Is there a
    way to do that in W2K Pro? A managed personal firewall might work, but the
    administrative overhead is too high to justify, just to stop this problem.


    > -----Original Message-----
    > From: Shawn Jackson []
    > Sent: Wednesday, December 03, 2003 4:48 PM
    > To: Alexander Lukyanenko;
    > Subject: RE: Messenger service abuse (from inside the network)
    > 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.


  • Next message: Tres London: "RE: WiFi security implications"

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