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05-03-2008, 11:36 PM
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#1
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Senior Member
Registered: Feb 2004
Location: lost+found
Distribution: CentOS
Posts: 1,430
Rep: 
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How many alerts a day do you get on snort?
How many alerts a day do you get on snort?
I know I'm getting way too many and want to optimize, but I don't want to optimize too much.
How many alerts/day should I try to get it down to?
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05-04-2008, 07:24 AM
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#2
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Moderator
Registered: May 2001
Posts: 29,415
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Quote:
Originally Posted by abefroman
How many alerts a day do you get on snort?
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Ranging from a few to a few hundred.
Quote:
Originally Posted by abefroman
I know I'm getting way too many and want to optimize, but I don't want to optimize too much. How many alerts/day should I try to get it down to?
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I think your aim should not be to bring the amount of alerts down (quantity) but what it trips on (quality).
First prune rulesets that you don't need (anything P2P, etc, etc). Log for a while. Then assess which services are exposed to world and should need watching, then gather statistics to see what it trips on. Correlate stats with services and prune rules further (MS-.*, Solaris, Websphere). Then add a BPF filter for services that need watching but are accessed from "trusted" ranges if it trips on that. Log for a while. Search logs for false positives and also see threshold.conf for alert/warn ratios. |
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05-04-2008, 06:19 PM
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#3
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Senior Member
Registered: Feb 2004
Location: lost+found
Distribution: CentOS
Posts: 1,430
Original Poster
Rep:
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Quote:
Originally Posted by unSpawn
Ranging from a few to a few hundred.
I think your aim should not be to bring the amount of alerts down (quantity) but what it trips on (quality).
First prune rulesets that you don't need (anything P2P, etc, etc). Log for a while. Then assess which services are exposed to world and should need watching, then gather statistics to see what it trips on. Correlate stats with services and prune rules further (MS-.*, Solaris, Websphere). Then add a BPF filter for services that need watching but are accessed from "trusted" ranges if it trips on that. Log for a while. Search logs for false positives and also see threshold.conf for alert/warn ratios.
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Thanks! I did my first batch of pruning and am letting it run a while now.
Can you give an example of one of the rules I should be concerned about if I see?
Either from Emerging Threats or one of the Snort VRT rules. |
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05-04-2008, 09:03 PM
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#4
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Moderator
Registered: May 2001
Posts: 29,415
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Quote:
Originally Posted by abefroman
Can you give an example of one of the rules I should be concerned about if I see?
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Whatcha running Willis? |
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05-04-2008, 10:27 PM
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#5
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Senior Member
Registered: Feb 2004
Location: lost+found
Distribution: CentOS
Posts: 1,430
Original Poster
Rep:
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Quote:
Originally Posted by unSpawn
Whatcha running Willis?
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 Apache, php, mysql, ssh, pop, exim |
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05-05-2008, 07:35 AM
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#6
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Moderator
Registered: May 2001
Posts: 29,415
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What runs on top of PHP? Are those services all exposed to world w/o access restrictions?
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05-05-2008, 10:52 AM
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#7
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Senior Member
Registered: Feb 2004
Location: lost+found
Distribution: CentOS
Posts: 1,430
Original Poster
Rep:
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What runs on top of PHP?
>>You name it, its running
Are those services all exposed to world w/o access restrictions?
>>Yes
Here are my top 10 alerts over about 12 hours, are these any to be concerned with?
http://abefroman.com/topten.html
Last edited by abefroman; 05-05-2008 at 11:26 AM.
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05-06-2008, 08:53 AM
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#8
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Moderator
Registered: May 2001
Posts: 29,415
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Quote:
Originally Posted by abefroman
Are those services all exposed to world w/o access restrictions?
>>Yes
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Why does the whole world need access to MySQL, SSH, POP, MTA? Is this an ISP machine?
Quote:
Originally Posted by abefroman
Here are my top 10 alerts over about 12 hours, are these any to be concerned with?
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You can follow those "Snort" links to learn more about what that sig matches. If it matches a regular GET request for instance you know it's not. |
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