Heh. Thanks Shirky..
<shameless plug>
Sounds like you need RNA. http://www.sourcefire.com/products/rna.html
The reason that Sourcefire invented RNA was to solve one of the
problems you are facing -- rogue devices on your network. It is
possible to discover devices that are not 'yours' on your network,
however, once a machine picks up a dhcp address on your network
(humor me if you don't have dhcp), how can you tell the difference
between a real (authorized device) and a non-authorized device? No
Snort rule you write will help you find them. Therein lies one of
the fundamental problems of today's networks, no contextual
alerting, no idea what is on the network, and finally, no compliance
(which, really, isn't that what we are discussing here?).
Which is why Sourcefire invented RNA.
</shameless plug>
On the other hand, it might help if you called your snort.conf via
the command line using the -c tag. :)
Joel
On Oct 11, 2006, at 11:15 AM, M. Shirk wrote:
Well Snort can help detect such traffic, but you have a problem
with your
security policy and procedures if people are just showing up and
jacking
into the wall and having full access to the network (where is your
addresss???? ) :-)
Also, what is $EXTERNAL_NET set to? probably "any" in the snort.conf?
And why are you using ALL of the private addresses? you should be
using a
variable that is something like
var HOME_NET [10.111.0.0/16]
var EVIL_NET !$HOME_NET
More then likely, an on internal network, your sig will fire on
every packet
:-)
Ok finchy, your turn.
Shirkdog
http://www.shirkdog.us
From: "Nick Baronian" <kvetch@gmail.com>
To: "snort-users@lists.sourceforge.net" <snort-
users@lists.sourceforge.net>
Subject: [Snort-users] Question about !HOME_NET
Date: Wed, 11 Oct 2006 10:47:00 -0400
I am trying to setup a simple rule but it doesn't appear to be
working. We have has some issues with people plugging in their
laptops
to our corp. network. Some of these folks have static addresses and
try to send some traffic outbound, while the traffic gets dropped
at a
firewall I want to log and alert on any non Home_NET IP's trying
to go
out. I thought it would be fairly easy just set home_net to something
like
var HOME_NET [172.0.0.0/8,10.0.0.0/8,192.168.0.0/16] and var HOME_NET
[172.0.0.0/8,10.0.0.0/8,192.168.0.0/16] then comment out other rules
in snort.conf except local.rule.
In local rule set it to something like
alert ip !HOME_NET any -> $EXTERNAL_NET any (msg:"nonwork routable IP
detected";)
I then start snort like
snort -e -i eth1 -l /u01/snort -s -D &
When I look at the log down /u01/snort it lists tons of IP's going
from an IP like 10.30 or 172.x.x.x going to some random IP. How do I
get my rules to only log the packets for non-Home_Net IP's trying to
talk to other non-Home_Net IP's?
Thanks,
Nick
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Using Tomcat but need to do more? Need to support web services,
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Get stuff done quickly with pre-integrated technology to make your
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Download IBM WebSphere Application Server v.1.0.1 based on Apache
Geronimo
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+---------------------------------------------------------------------+
joel esler senior security consultant 1-706-627-2101
Sourcefire Security for the /Real/ World -- http://www.sourcefire.com
Snort - Open Source Network IPS/IDS -- http://www.snort.org
gpg key: http://demo.sourcefire.com/jesler.pgp.key
aim:eslerjoel ymsg:eslerjoel gtalk:eslerj
+---------------------------------------------------------------------+
-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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