Snort mailing list archives
Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM
From: Gregory S Thomas <greg.thomas () pnl gov>
Date: Thu, 17 May 2007 12:11:35 -0700
We modify the rule to make it less noisy: var MULTICAST_NET 224.0.0.0/4 alert ip any any -> !$MULTICAST_NET any (msg:"BAD-TRAFFIC IP Proto 103 PIM"; ip_proto:103; reference:bugtraq,8211; reference:cve,2003-0567; reference:nessus,11791; classtype:non-standard-protocol; sid:2189; rev:4;) Here's the line in oinkmaster.conf that performs the modification: modifysid 2189 "->\s*any" | "-> !\$MULTICAST_NET" Cheers, -- greg ---------- Original Message ---------- Subject: [Snort-users] non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM Date: Thu, 17 May 2007 04:21:56 -0700 From: "David Ryan" <David.Ryan () Quintiles com> To: <snort-users () lists sourceforge net> Hi all, I am seeing loads (like 90% of all events) of these events showing up on one of my Snort sensors. I have looked at the description here - _http://www.snort.org/pub-bin/sigs.cgi?sid=2189_ - and I looked at the rule definition and it appears to match simply on the existence of IP protocol 103 as distinct from any payload within it. I see the traffic coming from two known Cisco routers on the subnet I'm monitoring and the traffic is destined for 224.0.0.13 which is the multicast address for PIM - _http://www.networksorcery.com/enp/protocol/pim.htm_ I have also I have seen it on other sites and subnets on the network I am monitoring, so I guess whatever function is causing this traffic to originate from the router is used across the organisation. In order to make the output from snort a little more readable (and because it is matching on the protocol and not the payload) I have disabled this rule. I know the protocol in question is a routing-related protocol, but does anyone have any views or explanation on the normal use of this protocol ? Thanks, David =========================================== David Ryan IT Security Engineer, Global IT Security Quintiles, Global IT - Infrastructure, QDUB david.ryan () quintiles com v: +353-1-819-5186, GMT+0 m: +353-87-124-9108 ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM David Ryan (May 17)
- Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM doug schmidt (May 17)
- Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM doug schmidt (May 17)
- <Possible follow-ups>
- Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM David Ryan (May 17)
- Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM Gregory S Thomas (May 17)
- Re: non-standard-protocol : BAD-TRAFFIC IP Proto 103 PIM doug schmidt (May 17)