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Network Security Snort-Signatures
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Re: [Snort-sigs] [snort] why disabled "BAD TRAFFIC data in TCP SYN packe

Subject: Re: [Snort-sigs] [snort] why disabled "BAD TRAFFIC data in TCP SYN packet" rules on snort v2.3.3 (and before) ?
Date: Fri, 20 May 2005 09:39:39 +1200
On Thu, 2005-05-19 at 14:11 +0200, rmkml wrote:
Hi,

on snort v2.3.3 (and before), why this rule is disabled ? :

bad-traffic.rules:# alert tcp $EXTERNAL_NET any -> $HOME_NET any 
(msg:"BAD-TRAFFIC data in TCP SYN packet"; flow:stateless; dsize:>6; 
flags:S,12; reference:url,www.cert.org/incident_notes/IN-99-07.html; 
classtype:misc-activity; sid:526; rev:11;)

Ah! I had not notice that it had been disable -- I was seeing some (what
I think were MTU discovery or similar services) sending blocks of NULLs
in SYN packets.

I'm guessing that these 'false +ves' out weighed the utility of the
rules.

Russell

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