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Date: Tue, 08 Feb 2005 10:13:02 -0600
From: Paul Schmehl <pauls@utdallas.edu>
To: crzdgns1@starpower.net, freebsd-questions@freebsd.org
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Subject: Re: Newbie Security Concerns
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--On Tuesday, February 08, 2005 11:01:11 AM -0500 crzdgns1@starpower.net 
wrote:
>
> I am a new user of UNIX and FreeBSD and have never had to do any
> administration or security configuration myself before.  I am running
> IP Firewall on FreeBSD-5.3-RELEASE.  Last night I was checking my
> logs and discovered  that sshd reported many illegal users.  Does
> that mean my system i compromised?  As configured, there are only
> three accounts on my system, root, toor, and one user account for
> me.  I suppose you need more information from me, but am not sure
> what to provide.  Any help would be greatly appreciated.
>
In addition to the firewall, you should edit /etc/hosts.allow and only 
allow remote access from trusted hosts.  That will completely stop the 
random ssh login attempts.

man (5) hosts_access

Paul Schmehl (pauls@utdallas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu