Snort mailing list archives
RE: IDS provisioning site analysis tool?
From: "Williams Jon" <WilliamsJonathan () JohnDeere com>
Date: Tue, 13 Apr 2004 09:55:55 -0500
That's all well and good for an installed IDS product, but it sounds to me as if RNA is both a compensation for a lack of administrator knowledge and an ongoing false-positive reduction technique. I think what I'm looking for is more of a tool to help admins understand what their environment is prior to deploying IDS. Most of this is based on my experiences with my current IDS setup. If I only relied on the snort.org rulesets, I'd be missing a whole slew of traffic that, while not hostile from the signature standpoint, is at a minimum anomalous (i.e. IP addresses that are not our sourcing traffic that is destined to IP addresses which are also not our, etc.) and at worst point to serious chinks in our network armor. We've done a number of tcpdump experiments, gradually winnowing out stuff that we don't want to see and it has helped us develop custom rules that are extremely good at finding these oddities. I was hoping to find either a tool or enough people interested in such a tool to get one written. Jon -----Original Message----- From: Martin Roesch [mailto:roesch () sourcefire com] Sent: Tuesday, April 13, 2004 9:33 AM To: Williams Jon Cc: Snort Users List; Focus-Ids Subject: Re: [Snort-users] IDS provisioning site analysis tool? Hi Jon, I think our RNA product can help you, it performs passive OS identification, passive service protocol identification (including vendor and version ID), flow logging, passive vulnerability inference, target (host) modeling, etc. To address your "feature list", RNA can do the following things: - Connection summaries (flow logging/analysis) - Passive OS & Service fingerprinting including identification of service vendor/version - List of services/vendors/versions & host models for rules selection It doesn't produce automatic rule tuning at this point, I think that that feature will show up in the future though. RNA is a commercial product though, so I don't know how that might fit with budgetary constraints you might have. One thing you might consider if you *do* have a budget is that Sourcefire is offering a Snort Agent product now that can transport event data from open source sensors up to the Sourcefire Management Console (MC) for analysis/reporting/incident management. Our version 3.1.2 update for the MC that's coming out this week includes an Impact Correlator that analyzes events coming from the IDSes against RNA's network/vulnerability map and can gauge the impact of an event based on the real-time assessment of your network environment. This is pretty cool because it's independent of the arbitrary priority field in Snort rules that may or may not have any relevance to your actual network. Anyway, enough marketing foo. If you want to try to wire something together with open source parts you could probably do so with a variety of pieces parts and a bunch of perl, depends on how much time you've got... -Marty On Apr 12, 2004, at 12:43 PM, Williams Jon wrote:
I've been doing IDS work at one site for several years now and have found that a lack of knowledge about what network traffic is supposed to exist, one spends the majority of their efforts researching non-issues. Having spent the time on my local network, I've got that understanding
here, but I'm considering locating sensors at other sites where that knowledge is lacking. Over the weekend, I got this wild hair that I'd
like a tool that I could run on the new sensor box prior to kicking up
the IDS. This tool would do the following things: - Monitor the network, displaying some form of a summary of connections, probably organized by service port - Passive OS and server fingerprinting to help differentiate Apache on
Linux from IIS on W2K, etc. - Through a keypress (like "i"), flag a given service to be ignored in
the future and document what it is Additionally, I think that it might be useful to be able to produce some form of output that lists the applications/OSes found for use in selecting IDS rules (i.e. use the file with some script that would deactivate any snort.org rule for which there isn't a corresponding target). I doubt that this feature would be in any current tool, although I think it could be useful. The way I'm thinking, I'd do a site survey, identify everything I could as a known application. Whatever's left would need to be tracked down and either documented as a proper business app or terminated. Once that's done, this tool could produce the "My Environment" list for use in building IDS rulesets and/or continue running as a daily checkpoint for new, unknown/unauthorized traffic. So, does anyone know of a tool or a set of tools that can do this? If
not, does anyone else see any value in such a beast? Thanks. Jon ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
-- Martin Roesch - Founder/CTO, Sourcefire Inc. - (410)290-1616 Sourcefire: Intelligent Security Monitoring roesch () sourcefire com - http://www.sourcefire.com Snort: Open Source Network IDS - http://www.snort.org ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id70&alloc_id638&op=click _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- IDS provisioning site analysis tool? Williams Jon (Apr 12)
- RE: IDS provisioning site analysis tool? Jerry Shenk (Apr 12)
- Re: IDS provisioning site analysis tool? Martin Roesch (Apr 13)
- <Possible follow-ups>
- RE: IDS provisioning site analysis tool? Williams Jon (Apr 13)
- Re: IDS provisioning site analysis tool? Martin Roesch (Apr 13)