Re: Questions: nmap, nessus unreliability, setting up a packet capture box, using Impacket

From: Dan Goldberg (dan_at_madjic.net)
Date: 04/23/04

  • Next message: Dan Goldberg: "Re: Web site testing" 
    To: Paul Johnston <paul@westpoint.ltd.uk>, pen-test@securityfocus.com
Date: Fri, 23 Apr 2004 14:12:27 -0400

    > 1) How reliable have people here found nmap and nessus to be?
    > Anything that can be done about this?

    Paul,
            I have had very good luck with Nmap. It helps to know something
    about the path to the host(s) your are interested in. You will get
    different results and responses depending on whether there are
    firewalls or packet filters between the scanner and target. (Sorry I
    know this is obvious).
            In addition I always capture a packet trace of any scan I perform
    create an audit trail of the scan and see anything that Nmap fails to
    report on as I would expect.
            I also tend to break large scans in to smaller chunks. Rather than
    scanning -p 1-65535 on a host I will script out a few chunks at a
    time usually getting well known or expected ports first. This is
    mostly to keep from bogging down the scanner (especially if the
    scanner is a windows box).

    > 2) I'm looking at setting up a box to capture all traffic on our
    > scanning network. Does anyone have thoughts on doing this, based on
    > their operational experiences?

    I would think that a system like Shadow
    http://www.nswc.navy.mil/ISSEC/CID/ would help here or else Snort in
    Logging mode.
            I have used Shadow to capture large amounts of traffic on a 24 hour
    basis and the front end is excellent for reviewing headers. It does
    collect IIRC the 1st 68 bytes though not entire packets.

    > 3) Using Core Impact's Impacket library,
    I have never used this.

    Hope this helps. 

    -- 
dan@madjic.net
-- 
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