Re: False positives(?) for spp_sip

["Pettersson, Emil" <emil.pettersson () sovos com>]

Thank you Joel, so I would just comment out the entire block below then? For reference, do you know if changes such as 
these would get overwritten during updates? I know we have some customization we’ve done for Snort logging (mainly in 
/usr/local/pkg/snort/snort_check_for_rule_updates.php) and for these we end up redoing these changes if Snort package 
is updated, just wanted to make sure we include in our routines if the same goes for the snort.conf file.

preprocessor sip: max_sessions 40000, \
   ports { 5060 5061 5600 }, \
   methods { invite \
             cancel \
             ack \
             bye \
             register \
             options \
             refer \
             subscribe \
             update \
             join \
             info \
             message \
             notify \
             benotify \
             do \
             qauth \
             sprack \
             publish \
             service \
             unsubscribe \
             prack }, \
   max_uri_len 512, \
   max_call_id_len 80, \
   max_requestName_len 20, \
   max_from_len 256, \
   max_to_len 256, \
   max_via_len 1024, \
   max_contact_len 512, \
   max_content_len 2048

From: Joel Esler (jesler) <jesler () cisco com>
Sent: Friday, 17 April 2020 15:20
To: Pettersson, Emil <emil.pettersson () sovos com>
Cc: snort-sigs () lists snort org
Subject: Re: [Snort-sigs] False positives(?) for spp_sip

Hello Emil,

If you are not running SIP on your network, then yes, comment out the SIP preprocessor and that will solve your 
problem.  This can be done in your snort.conf file.
Sent from my  iPad


On Apr 17, 2020, at 09:01, Pettersson, Emil <emil.pettersson () sovos com<mailto:emil.pettersson () sovos com>> wrote:

Hi,

We’ve been getting a few blocks for traffic from customers, from looking into the logs if I’m understanding correctly 
these are getting caught by spp_sip due to traffic in these instances having source port 5060 (they’re doing a few 
thousand/day with random source port span).
Apr 17 09:33:31 snort[17881]: [140:3:2] (spp_sip) URI is too long [Classification: Potentially Bad Traffic] [Priority: 
2] {TCP} [SOURCE_IP]:5060 -> [DESTINATION_IP]:443
There is no actual SIP traffic expected to go in or out from this network, so regardless of anything else I believe 
there’s no real reason to have these rules enabled? However I am unsure of what the correct way would be to disable 
them?
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