RE: [Full-disclosure] how to bypass rouge machine detection techniques

From: Cassidy Macfarlane (cmacfarlane_at_Drummond-Miller.co.uk)
Date: 07/11/05

  • Next message: Lauro, John: "RE: [Full-disclosure] how to bypass rouge machine detection techniques" 
    Date: Mon, 11 Jul 2005 12:05:14 +0100
To: "Gaurav Kumar" <gkverma@gmail.com>, <full-disclosure@lists.grok.org.uk>

    >From the whitepaper:

    "Empirical evidence has also shown that computers that are actively in
    use
    tend to broadcast rather frequently."

    Read that as 'badly-configured computers'. It is a no-brainer to not
    broadcast from a machine that is 'rogue' - IE a prospective
    attacker/wardriver would not 'announce' their presence on your network
    by sending a whole load of broadcast packets.

    Additionally, multiple virtual MACs could be created, and used to send
    L2 b/casts to the sensor, thereby creating a mass of false positives,
    and DOS-ing your IDS.

    I just thought of these off the top of my head, I have no experience of
    this particular software, but it does not seem too robust to me. A
    passive sniffer would not broadcast, but would sit on your network
    happily sucking up packets. To completely bypass the system, you could
    simply spoof the IP/MAC of a trusted and registered system.

    (BTW, it's spelt 'rogue'{there are about 14 instances of the bloody word
    in the pdf you referenced} - 'rouge' is a kind of makeup.)

    HTH

    -----Original Message-----
    From: full-disclosure-bounces@lists.grok.org.uk
    [mailto:full-disclosure-bounces@lists.grok.org.uk] On Behalf Of Gaurav
    Kumar
    Sent: 11 July 2005 10:59
    To: full-disclosure@lists.grok.org.uk
    Subject: [Full-disclosure] how to bypass rouge machine detection
    techniques

    Friends,

    There are several techniques available for detecting rouge (not being
    a member of trusted domain) machines, such as active scanning, active
    directory querying etc, but I guess most powerful being the one used
    by epolicy orchestrator. Its agents (deployed on each subnet) checks
    for L2 broadcasts like Arp broadcast etc. After detecting a broadcast,
    it used the mac address and ip address to proceed further to detect
    whether the machine is rouge or not.

    http://www.networkassociates.com/us/local_content/white_papers/wp_epo3_5
    _rsdwhitepaper_july2004.pdf

    I was wondering if this approach is foolproof and can be safely
    deployed or if there is a way to bypass it?

    Regards,
    Gaurav
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