[Snort-users] IDS provisioning site analysis tool?

Martin Roesch roesch at ...1935...
Tue Apr 13 07:33:51 EDT 2004

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 


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
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Martin Roesch - Founder/CTO, Sourcefire Inc. - (410)290-1616
Sourcefire: Intelligent Security Monitoring
roesch at ...1935... - http://www.sourcefire.com
Snort: Open Source Network IDS - http://www.snort.org

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