full-disclosure - Re: targetted SSH bruteforce attacks

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Date: Thu, 17 Jun 2010 14:32:44 +0200
From: Gregory Bellier <gregory.bellier@...il.com>
To: Gary Baribault <gary@...ibault.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: targetted SSH bruteforce attacks

Hi !

Most of the time (to not say everytime), it's a bot and not a human behind
those attacks.
I configured my firewall to ban for a minute every IPs trying to log in with
5 wrong attempts.
Once it's banned, the bot tries one or two more times and then give up.

It's pretty much effective.



2010/6/17 Gary Baribault <gary@...ibault.net>

> Hello list,
>
>    I have a strange situation and would like information from the
> list members. I have three Linux boxes exposed to the Internet. Two of
> them are on cable modems, and both have two services that are publicly
> available. In both cases, I have SSH and named running and available
> to the public. Before you folks say it, yes I run SSH on TCP/22 and no
> I don't want to move it to another port, and no I don't want to
> restrict it to certain source IPs.
>
>    Both of these systems are within one /21 and get attacked
> regularly. I run Denyhosts on them, and update the central server once
> an hour with attacking IPs, and obviously also download the public
> hosts.deny list.
>
>    These machines get hit regularly, so often that I don't really
> care, it's fun to make the script kiddies waste their time! But in
> this instance, only my home box is being attacked... someone is
> burning a lot of cycles and hosts to do a distributed dictionary
> attack on my one box! The named daemon is non recursive, properly
> configured, up to date and not being attacked.
>
>    Is anyone else seeing this type of attack? Or is someone really
> targeting MY box?
>
> Thanks
>
>
> Gary Baribault
> Courriel: gary@...ibault.net
> GPG Key: 0x685430d1
> Signature: 9E4D 1B7C CB9F 9239 11D9 71C3 6C35 C6B7 6854 30D1
>
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