[Snort-users] Snort Configurations

Greg Lane greglane at ...14965...
Wed Sep 22 15:01:34 EDT 2010


Well there are 3 types of http_inspects that I am getting mainly.  http_inspect: LONG HEADER, http_inspect: NON-RFC DEFINED CHAR, http_inspect: OVERSIZE REQUEST-URI DIRECTORY.
Everyone of the sources are from inside my network.  Many of them are to amazon EC, quantserve.com(cookie related), yahoo, google, facebook, and Pandora.  So you can see that most of the traffic is legit and it isn't being triggered from outside the domain.  I'm just not sure how to cut down on the number of alerts.  When I get that done I will move on to the next but I am trying to do this in steps so that I can understand everything that is going on 

Greg Lane
IT Manager
Lane Enterprises

Email:  greglane at ...14965...
Phone: (228)872-2414

-----Original Message-----
From: waldo kitty [mailto:wkitty42 at ...14940...] 
Sent: Wednesday, September 22, 2010 1:21 PM
To: snort-users at lists.sourceforge.net
Subject: Re: [Snort-users] Snort Configurations

On 9/22/2010 12:39, Greg Lane wrote:
> I’m starting to learn how to tune my Snort install and it is a slow process.  I
> have alerts like crazy because I know it needs to be tuned and I especially have
> a lot of http_inspect alerts coming up. I’ve been reading and from what I can
> gather if you don’t have a websever you may not really need this in operation or
> am I wrong?

the answer is "it depends"... it depends on if you want to monitor outbound http 
traffic to possibly catch infestations on your network that are reporting in or 
attacking remote http servers... you might also catch (and be able to prevent) 
internal machines that are being redirected to driveby sites that would (attempt 
to) load them with infestation materials...

> If I am wrong then what is the best possible solution for me to cut
> down most of the alerts which are false positives so to speak or aren’t
> dangerous at all? This will probably be one of many questions concerning configs
> coming to an email box near you.

false positives need to be reported to those who write those rules so they can 
be looked into and adjusted if necessary...


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