full-disclosure - Re: targetted SSH bruteforce attacks

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Date: Thu, 17 Jun 2010 08:54:35 -0400
From: Gary Baribault <gary@...ibault.net>
To: Emmanuel VERCHERE <emmanuel.verchere@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: targetted SSH bruteforce attacks

Thanks Emmanuel,

    I have to access that box sometimes from other machines than my
own, so I would have to have my key and install it on all kinds of
Windows boxen .. I have extremely good passwords that I change every
30 days, or every time I use a machine that I'm not 100% sure of.

Gary Baribault

Courriel: gary@...ibault.net
GPG Key: 0x685430d1
Signature: 9E4D 1B7C CB9F 9239 11D9 71C3 6C35 C6B7 6854 30D1


On 06/17/2010 08:45 AM, Emmanuel VERCHERE wrote:
> Hi Gary,
>
> SSH daemons using password auth exposed to the Internet _do_ get
> bruteforce attempts. I would not recommend moving it to a different port
> than 22 as that would be of very, _very_ little help - rather switch to
> public key auth (plus SPA if you're paranoid), et voila.
> I don't think there's someone out there craving for _your_ box - but
> scripts running from compromised hosts, scanning for password-protected
> SSH daemons (as well as a bunch of known exploitable webapps and
> services), trying to reach out for 'fresh meat', and as such expand the
> zombie net? Definitely ;)
>
> Cheers.
> 
>
>
> On Thu, 17 Jun 2010 07:48:18 -0400
> Gary Baribault <gary@...ibault.net> wrote:
>
>> 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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>
>


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