Re: [Full-disclosure] New round of SSH scan IP's

[James Lay <jlay@xxxxxxxxxxxxxxxxxxx>]

On 7/9/08 3:20 AM, "Peter van den Heuvel" <peter@xxxxxxxx> 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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