Scot Hetzel wrote:
However, there apparently are SSH bruteforcers that simply use one
connection to perform a brute-force attack:
Aug 18 00:00:01 aberdeen sshd[87989]: Invalid user serwis from
83.19.113.122
Aug 18 00:00:03 aberdeen sshd[88010]: Invalid user serwis from
83.19.113.122
Aug 18 00:00:05 aberdeen sshd[88012]: Invalid user serwis from
83.19.113.122
Aug 18 00:00:10 aberdeen sshd[88014]: Invalid user serwis from
83.19.113.122
Aug 18 00:00:13 aberdeen sshd[88019]: Invalid user serwis from
83.19.113.122
Aug 18 00:00:14 aberdeen sshd[88021]: Invalid user serwis from
83.19.113.122
It looks as though you need to lower 'MaxAuthTries' in your
sshd_config file, as the default is set to allow six authentication
attempts per connection.
I had already lowered this value to '3', which apparantly does not
matter at all. I even forgot that I did, which says enough ;)
Makes me wonder even more what's happening; even with 3 auth sessions
per connection, that would mean only 9 attempts per minute should be
possible. I'm seeing >100 attempts per minute, though.
--
Pieter
_______________________________________________
freebsd-security@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security
To unsubscribe, send any mail to "[EMAIL PROTECTED]"
