I agree, although it is a great learning experience to keep a sensor outside
of your firewall. I learned a great deal due to the increased frequency of
attacks. When my router is set up properly there aren't any unsolicited
incoming packets (that I've seen), so it can be a bit boring.
For now, I'd have to recommend keeping it outside, so that you can get a
feel for the setup. More data coming into BASE will help you move about, and
then you will have a better idea of what to expect if you move the sensor
inside the firewall and wonder, Is this thing on? -- as you'll hopefully get
far fewer alerts.
Ideally you would have at least two taps, one right in front of your
firewall and one directly behind. Then you could compare the data from the
two and identify what is getting through and work on figuring out the why.
My two cents
Lee
-----Original Message-----
From: snort-users-admin@lists.sourceforge.net
[mailto:snort-users-admin@lists.sourceforge.net] On Behalf Of Briggs, Bruce
Sent: Tuesday, November 15, 2005 4:01 PM
To: Timothy A. Holmes; snort
Subject: RE: [Snort-users] Where do I go from here
So you are monitoring what is outside you door in a crime-ridden
neighborhood (the Internet).
This does not tell you what is coming through your door (your firewall).
Personally, I care what makes it into my network. I don't care all that
much about what does not make it into my network.
So for me, I want an IDS inside my network. For me, an IPS is a better
candidate to be outside your firewall than an IDS.
Bruce
________________________________
From: snort-users-admin@lists.sourceforge.net
[mailto:snort-users-admin@lists.sourceforge.net] On Behalf Of Timothy A.
Holmes
Sent: Tuesday, November 15, 2005 2:16 PM
To: snort
Subject: [Snort-users] Where do I go from here
Hi Folks:
After some fits and starts, I believe that I have a functional IDS Box
watching the front door now, and I took out the back door (Wireless ap) and
repaired the hole in the wall with bricks and mortar
So, I guess the next question is what is the next step?
To summarize, I have a SNORT box up and sniffing on the inbound line between
the Cable Modem and the Firewall. The management port is inside the
firewall and has an IP on it while the sniffing port is outside the firewall
and does not have one.
I am logging to a mysql database, and running base for reporting.
As of the last check, I have received about 4500 alerts today, here is the
breakdown from base on them
Displaying alerts 1-7 of 7 total
< <https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=sig_a>
Signature >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=sig_d>
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=class_a>
Classification >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=class_d>
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=occur_a>
Total # >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=occur_d>
Sensor #
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=saddr_a>
Source Address >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=saddr_d>
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=daddr_a>
Dest. Address >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=daddr_d>
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=first_a>
First >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=first_d>
<
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=last_a>
Last >
<https://192.168.0.28/base/base_stat_alerts.php?caller=&sort_order=last_d>
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=3> ] (portscan) TCP
Portsweep
unclassified
55
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=1&sig_type=1&submit=Query+DB&num_result_rows=-1> (0%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=1&;
sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=1>
31
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=1>
2005-11-15 03:06:05
2005-11-15 13:12:23
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=27> ] (portscan) Open Port
unclassified
3679
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=2&sig_type=1&submit=Query+DB&num_result_rows=-1> (33%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=2&;
sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=2>
302
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=2>
2005-11-15 03:06:08
2005-11-15 13:12:28
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=4> ] (http_inspect) BARE
BYTE UNICODE ENCODING
unclassified
444
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=3&sig_type=1&submit=Query+DB&num_result_rows=-1> (4%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=3&;
sig_type=1>
2
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=3>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=3>
2005-11-15 00:37:16
2005-11-15 14:12:38
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=2> ] (http_inspect) DOUBLE
DECODING ATTACK
unclassified
21
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=4&sig_type=1&submit=Query+DB&num_result_rows=-1> (0%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=4&;
sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=4>
9
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=4>
2005-11-15 07:16:16
2005-11-15 12:38:53
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=15> ] (http_inspect)
OVERSIZE REQUEST-URI DIRECTORY
unclassified
6
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=6&sig_type=1&submit=Query+DB&num_result_rows=-1> (0%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=6&;
sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=6>
3
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=6>
2005-11-15 10:43:42
2005-11-15 11:46:43
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=1> ] (portscan) TCP
Portscan
unclassified
3
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=9&sig_type=1&submit=Query+DB&num_result_rows=-1> (0%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=9&;
sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=9>
3
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=9>
2005-11-15 10:36:26
2005-11-15 10:36:42
[snort <http://www.snort.org/pub-bin/sigs.cgi?sid=16> ] (http_inspect)
OVERSIZE CHUNK ENCODING
unclassified
3
<https://192.168.0.28/base/base_qry_main.php?new=1&sig%5B0%5D=%3D&sig%5B1%5D
=13&sig_type=1&submit=Query+DB&num_result_rows=-1> (0%)
1
<https://192.168.0.28/base/base_stat_sensor.php?sig%5B0%5D=%3D&sig%5B1%5D=13
&sig_type=1>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=1&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=13>
1
<https://192.168.0.28/base/base_stat_uaddr.php?addr_type=2&sig_type=1&sig%5B
0%5D=%3D&sig%5B1%5D=13>
2005-11-15 11:45:36
2005-11-15 11:46:40
I guess I need to know what to do next and how to begin utilizing this data
to better protect my network
Anyone who can help, or point me to the proper resources would be greatly
appreciated
TIM
Timothy A. Holmes
IT Manager / Network Admin / Web Master / Computer Teacher
Medina Christian Academy
A Higher Standard...
Jeremiah 33:3
Jeremiah 29:11
Esther 4:14
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