From owner-freebsd-security@FreeBSD.ORG  Wed Apr  6 15:57:48 2005
Return-Path: <owner-freebsd-security@FreeBSD.ORG>
Delivered-To: freebsd-security@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 064C516A4CE
	for <freebsd-security@freebsd.org>;
	Wed,  6 Apr 2005 15:57:48 +0000 (GMT)
Received: from freebee.digiware.nl (dsl439.iae.nl [212.61.63.187])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7D28143D45
	for <freebsd-security@freebsd.org>;
	Wed,  6 Apr 2005 15:57:46 +0000 (GMT)	(envelope-from wjw@withagen.nl)
Received: from [212.61.27.71] (dual.digiware.nl [212.61.27.71])
	by freebee.digiware.nl (8.13.1/8.13.1) with ESMTP id j36FvXDZ067962;
	Wed, 6 Apr 2005 17:57:33 +0200 (CEST)
	(envelope-from wjw@withagen.nl)
Message-ID: <425406ED.5060400@withagen.nl>
Date: Wed, 06 Apr 2005 17:57:33 +0200
From: Willem Jan Withagen <wjw@withagen.nl>
User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103)
X-Accept-Language: en-us, en
MIME-Version: 1.0
To: Martin McCormick <martin@dc.cis.okstate.edu>
References: <200504061549.j36Fn8Y5082507@dc.cis.okstate.edu>
In-Reply-To: <200504061549.j36Fn8Y5082507@dc.cis.okstate.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
cc: freebsd-security@freebsd.org
Subject: Re: What is this Very Stupid DOS Attack Script?
X-BeenThere: freebsd-security@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Security issues [members-only posting]
	<freebsd-security.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>,
	<mailto:freebsd-security-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-security>
List-Post: <mailto:freebsd-security@freebsd.org>
List-Help: <mailto:freebsd-security-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-security>,
	<mailto:freebsd-security-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 06 Apr 2005 15:57:48 -0000

Martin McCormick wrote:
> Apr  6 05:49:42 dc sshd[12422]: input_userauth_request: illegal
> 	user chuck
> 
> 	You get the idea.  This goes on for 3 or 4 minutes and then
> just stops for now.  I can almost promise that later, another attack
> will start from some other IP address and blaze away for a few
> minutes.

I asked the same question a while ago.
Seems that there are some linux type worms out there, that use this
to target not well protected linux systems.???
I've build some swatch-rules that after two of these hits, I dump
the host into ifpw-deny space.

--WjW