Snort mailing list archives
Re: [Snort-sigs] P2P GNUTella GET causes lots of false positives
From: "jon baer" <security () jonbaer net>
Date: Thu, 4 Sep 2003 17:12:02 -0400
I had to change it to "GET /uri-res/" (|47 45 54 20 2f 75 72 69 2d 72 65 73 2f|) to monitor correctly ... - Jon ----- Original Message ----- From: "Shane Smith" <shane () crownbank com> To: <snort-sigs () lists sourceforge net> Sent: Thursday, September 04, 2003 3:29 PM Subject: [Snort-sigs] P2P GNUTella GET causes lots of false positives
Hey Folks, I'm new to snort, so sorry if this has been covered recently. SID 1432 regarding p2p networks seems weird to me. alert tcp $HOME_NET any -> $EXTERNAL_NET !80 (msg:"P2P GNUTella GET"; flow:to_server,established; content:"GET "; offset:0; depth:4; classtype:policy-violation; sid:1432; rev:4;) If I am reading this correctly, than any packet containing "GET" headed
out
of my network, destined for any port other than 80 will trigger this rule. Won't this cause a false positive with every HTTP GET request to any external server with non-standard ports? For example: http://www.nhc.rtp.nc.us:8080/ Simply hitting that URL, causes the rule to fire. Thanks folks, Shane ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Snort-sigs mailing list Snort-sigs () lists sourceforge net https://lists.sourceforge.net/lists/listinfo/snort-sigs
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- Re: [Snort-sigs] P2P GNUTella GET causes lots of false positives jon baer (Sep 04)