Re: FYI: Empty IP used either as source IP or as destination IP in a rule. IP list: [].

[Matt Jonkman <jonkman () jonkmans com>]

Well put Jason. In a lower traffic environment snort does IP matching
well enough.

And even in a lot of medium speed installs using tools like snortsam
it's useful to match on bad IP lists. We know about tens of thousands of
bad IPs a highly secure site might want to block, but updating that into
an entire perimeter of firewalls every day isn't that feasible.

If we can just have snort match on the really bad ones and use snortsam
to add the rule live when we see a bad IP we save a lot of overhead in
firewall administration. Then we only have rules in for the ones we're
really seeing, and snortsam handles the admin overhead.

Works for me :)

Matt





Jason Brvenik wrote:
> I say use the tools you have to do the job you need when it needs to
> be done, just don't complain that the screws don't hold as well when
> you hammer them in.
>
> On Tue, Apr 28, 2009 at 1:21 PM, Joel Esler <jesler () sourcefire com> wrote:
> > Nice.  Then I'd rather see these rules used there instead of in Snort.
> >  Snort is not a firewall.
> > J
> >
> > On Tue, Apr 28, 2009 at 10:16 AM, Shirk Dog <shirkdog_list () hotmail com>
> > wrote:
> > > Get with it finchy.
> > >
> > > http://www.emergingthreats.net/fwrules/
> > >
> > > Shirkdog
> > > ' or 1=1--
> > > http://www.shirkdog.us
> > >
> > >
> > >
> > > ________________________________
> > > Date: Tue, 28 Apr 2009 09:15:42 -0400
> > > From: jesler () sourcefire com
> > > To: jlay () slave-tothe-box net
> > > CC: snort-users () lists sourceforge net
> > > Subject: Re: [Snort-users] FYI: Empty IP used either as source IP or as
> > > destination IP in a rule. IP list: [].
> > >
> > > On Tue, Apr 28, 2009 at 8:54 AM, James Lay <jlay () slave-tothe-box net>
> > > wrote:
> > >
> > > Ruleset gets updated at midnight:
> > >
> > >
> > > Apr 28 06:29:52 gateway snort[12383]: FATAL ERROR: >
> > > /chroot/snort/etc/snort/rules/emerging-drop.rules(49) => Empty IP used
> > > either as source IP or as destination IP in a rule. IP list: [].
> > >
> > > This is an emerging threats rule, so they'll see this email.  However, I'd
> > > still love to see these IP lists developed into Firewall rules for different
> > > Firewalls, or even routers.  People could then utilize the proper device to
> > > drop the traffic to and from these IPs instead of trying to use an IPS as a
> > > firewall.  This has needed to be done for a long time coming now.
> > >
> > > --
> > > joel esler | Sourcefire | gtalk: jesler () sourcefire com | 302-223-5974 |
> > > http://twitter.com/joelesler
> > >
> > > ________________________________
> > > Windows Live™ SkyDrive™: Get 25 GB of free online storage. Check it out.
> > >
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> >
> > --
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> > http://twitter.com/joelesler
> >
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-- 
--------------------------------------------
Matthew Jonkman
Emerging Threats
Phone 765-429-0398
Fax 312-264-0205
http://www.emergingthreats.net
--------------------------------------------

PGP: http://www.jonkmans.com/mattjonkman.asc



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