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Network Security Snort-Signatures
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Re: [Snort-sigs] nmap rules

Subject: Re: [Snort-sigs] nmap rules
Date: Fri, 06 Jul 2007 10:35:01 -0400




the only entry in local.rules is:
drop tcp any any -> any 80 (classtype:attempted-user; msg:"Port 80
connection initiated";)

I used this to verify that snort is actually doing something.

So when I try to connect to the web server on the snort box,the
connection times out and I see the following output in the log:

[**] [1:0:0] Port 80 connection initiated [**]
[Classification: Attempted User Privilege Gain] [Priority: 1]
07/05-15:47:41.917831 192.168.2.18:59375 <http://192.168.2.18:59375> ->
192.168.2.105:80 <http://192.168.2.105:80>
TCP TTL:59 TOS:0x0 ID:3429 IpLen:20 DgmLen:44
******S* Seq: 0x199A99FC  Ack: 0x0  Win: 0x1000  TcpLen: 24
TCP Options (1) => MSS: 1460
 


The problem is that your rule is not looking for anything more than a
"connection"

Add a flags:s+ and a flow:stateless

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