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| Subject: | Re: [Snort-sigs] [snort] why disabled "BAD TRAFFIC data in TCP SYN packet" rules on snort v2.3.3 (and before) ? |
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| 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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