SSH brute force China and Linux: best practices

[bazy84 at gmail.com (Bazy)]

On Sat, Jan 30, 2010 at 6:47 AM, Bobby Mac <bobbyjim at gmail.com> wrote:
> Hola Nanog:
>
> So after many years of a hiatus from Linux, ?I recently dropped XP in favour
> of Fedora. ?Now that my happy windows blinders are off, I see alarming
> things. ?Ugly ssh brute force, DNS server IP spoofing with scans and typical
> script kiddie tactics.
>
> What are the new set of best practices for those running a NIX home
> computer. ?Yes I have a firewall and I do peruse my logs on a regular
> basis.
>
> BTW: ever drop a malformed ?URL to alert an admin to some thing that sucks?
> w3.hp.com/execs/makes/too/much/money or
> www.yourbuddiesdomain.com/it/is/all/rfc/space/use/1918/when/referring/to/non/routable
>
> Thanks,
> BobbyMac
>

Hello Bobby,

Take a look at http://www.fail2ban.org and
http://denyhosts.sourceforge.net. I'm not Chinese but I'm sure that
brute-force attacks come from all over the world. Here's a little from
my logwatch.

Refused incoming connections:
      211.234.60.44 (211.234.60.44): 1 Time(s)
      218.3.88.114 (218.3.88.114): 1 Time(s)
      58.68.119.187 (58.68.119.187): 2 Time(s)
      89.149.149.132 (89.149.149.132): 5 Time(s)
      net137-143.paichai.ac.kr (203.250.137.143): 1 Time(s)


Regards,
Bazy