On 11/28/06, Thierry Zoller <[EMAIL PROTECTED]> wrote:
TO> J, you have made an attempt to fix it, but is is not sufficient. TO> An attacker can still add arbitrary hosts to the deny list. Can you propose a fix ? Apart from the aggressivness of this thread I find it interesting to read (from a tech standpoint).
Unlike Tavis, I haven't had the guts to actually install and test this little contraption. But it looks like setting the sshd config option "UseDNS no" might help. Then sshd will log the client IP instead of the client hostname, and you no longer need to rely on the attacker's DNS to tell you which IP to blacklist. Someone could still purposefully trigger a ban of an IP address they controlled, but I don't think they could do arbitrary IPs any longer. Regards, Brian
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