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Re: New round of SSH scan IP's
From: James Lay <jlay () slave-tothe-box net>
Date: Wed, 09 Jul 2008 07:07:19 -0600


On 7/9/08 3:20 AM, "Peter van den Heuvel" <peter () txnt net> wrote:

its not quite the best way, human resource-wise,
to get on top of these damn scanners :-|
We've replaced the allow ssh access to all with an allow on a need
basis. So most national IP-ranges, several foreign ones and some static
IPs are allowed. All the rest is bumped. We have no customers in China,
Korea, Russia, etc. It sure cut down on the number of scans we see.

We'll probably add rate limitation on top.

Client certificates would cut it down completely, but is more expensive
to implement. It would also require everybody to always carry a USB (or
something) with their cert.

I have a homebrew setup...using snort and syslog and an app called wots it
adds a firewall rule the first time something naughty happens.  It's bee
pretty effective all in all.  Last time I posted a list of IP's I had a net
admin contact me wanting more info since one of the IP's was one under his
responsibility.  Glad I could assist :D

James


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