full-disclosure - Re: Distributed SSH username/password brute forceattack

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Date: Tue, 23 Oct 2007 00:04:06 +0200
From: Anders B Jansson <hdw@...listi.se>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Distributed SSH
	username/password	brute	forceattack

A.L.M.Buxey@...ro.ac.uk wrote:
> Hi,
> 
>> Oct 22 20:36:13 nms sshd[90657]: Failed password for invalid user gopher 
>> from 77.46.152.2 port 55120 ssh2
> 
> user/password authentication for SSH?  one way of cleaning up your
> logs and killing this type of attack is to reconfigure your OpenSSH
> to only allow key based logins. stopped my 10M+ logfiles straight away

An even better way is to punt the attackers to a 'silent drop' table in your firewall.

Cuts your logs to nothing and keeps the kiddies wasting their time.

The latest attack surge is either directed or a bit more clever, haven't seen anything on my random user DSL traps.
-- 
// hdw

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