Re: [Full-disclosure] targetted SSH bruteforce attacks

[Gary Baribault <gary@xxxxxxxxxxxxx>]

In this attack, there's no need to throttle, the attacking computers hit
it once every 15 seconds or so from many different sources. My denyhosts
is not blocking 99.999% of the attempts.

Gary Baribault
Courriel: gary@xxxxxxxxxxxxx
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On 06/23/2010 12:33 PM, Cody Robertson wrote:
> On 6/23/10 4:22 AM, yersinia wrote:
>   
>> On Thu, Jun 17, 2010 at 4:21 PM, Samuel Martín Moro <faust64@xxxxxxxxx>wrote:
>>
>>     
>>> I also don't want to change my ssh port, nor restrict incoming IPs, ... and
>>> I use keys only to log in without entering password.
>>> So you're not alone.
>>> I had my IP changed several times, my servers are only hosting personal
>>> data.
>>> But I'm still seeing bruteforce attemps in my logs.
>>>
>>> Here's something I use on my servers.
>>> In cron, every 5-10 minutes, that should do it.
>>> Of course, if you're running *BSD, pf is way more interesting to do that.
>>>
>>> Perhaps could be better to use something standard as fail2ban
>>>       
>> http://www.ducea.com/2006/07/03/using-fail2ban-to-block-brute-force-attacks/?
>>
>>
>>
>>
>> _______________________________________________
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>>     
> If you have iptables it has ways you can do this throttle too many
> connections within a specified period. I much prefer using something
> such as this over third party software.
>
> I'm sure you can do this in PF however I'm not familiar with it enough
> to be certain (I'd be surprised if you couldn't however).
>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> Hosted and sponsored by Secunia - http://secunia.com/
>
>   

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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