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Date:      Wed, 2 Dec 2009 09:07:07 -0500
From:      Bill Moran <wmoran@collaborativefusion.com>
To:        Mike Tancsa <mike@sentex.net>
Cc:        freebsd-security@freebsd.org, Mohd Fazli Azran <mfazliazran@gmail.com>
Subject:   Re: Increase in SSH attacks as of announcement of rtld bug
Message-ID:  <20091202090707.f563976d.wmoran@collaborativefusion.com>
In-Reply-To: <200912021324.nB2DOc58001138@lava.sentex.ca>
References:  <200912010120.nB11Kjm9087476@freefall.freebsd.org> <200912010522.WAA03022@lariat.net> <200912011724.KAA10851@lariat.net> <200912011909.nB1J9JRM070879@lava.sentex.ca> <200912020145.SAA17523@lariat.net> <200912020150.nB21ossm072930@lava.sentex.ca> <4B1662BB.8000908@gmail.com> <200912021324.nB2DOc58001138@lava.sentex.ca>

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In response to Mike Tancsa <mike@sentex.net>:

> At 07:51 AM 12/2/2009, Mohd Fazli Azran wrote:
> > >
> >Seem they use multi host and brute force. My network are every day
> >increasing the activity of attempt ssh login with multiple host +
> >multiple login with multiple password. seem i got many of this messages
> >
> Yes, thats the latest pattern I have been seeing-- distributed, slow 
> and coordinated.  Here is a sample from one of my honeypots.  The 
> only way to deal with them I found is to have multiple sensors 
> throughout my network and aggregate the data.  Otherwise, each IP 
> only appears every few hrs in the logs.

I deal with it by immediately blocking any host that generates an
"invalid user" error.

Of course, that won't work for everyone :(

-- 
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran@collaborativefusion.com
Phone: 412-422-3463x4023

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