full-disclosure - Re: SSH brute force blocking tool

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Date: Fri, 01 Dec 2006 13:17:26 +0100
From: Tonnerre Lombard <tonnerre.lombard@...roup.ch>
To: "J. Oquendo" <sil@...iltrated.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: SSH brute force blocking tool

Salut,

On Fri, 2006-12-01 at 06:59 -0500, J. Oquendo wrote:
> >> Nov 27 16:31:21 local sshd[67010]: Illegal user dd from 213.134.128.227
> >> awk '($5=="Illegal"||$6=="Illegal")&&$9=="from"{print $10}'
> >
> > What if I set my user name to "bikermice from mars"? Are you going to
> > blacklist mars then?
> 
> Apparently you are as stupid as your question is. The syntax won't allow 
> to pass off anything. Try it before responding idiotically

Did you even try it? And what exactly in this awk statement would
prevent me from inserting mars in this case? The log statement would
look like this:

Nov 27 16:31:21 local sshd[67010]: Illegal user bikermice from mars from
213.134.128.227

In this case, your awk statement checks that argument $6 is
"Illegal" (which it is) and argument $9 is "from" (which it is). So it
takes $10 and prints it (in this case, mars.)

If you check $10 to look like an IP address, I set my username to
"bikermice from 217.14.64.1", you're going to blacklist 217.14.64.1
because it is a valid IP.

				Tonnerre
-- 
SyGroup GmbH
Tonnerre Lombard

Solutions Systematiques
Tel:+41 61 333 80 33    Roeschenzerstrasse 9
Fax:+41 61 383 14 67    4153 Reinach BL
Web:www.sygroup.ch      tonnerre.lombard@...roup.ch

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