full-disclosure - Re: SSH brute force blocking tool

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Message-ID: <456B5B97.1070305@infiltrated.net>
Date: Mon, 27 Nov 2006 16:41:43 -0500
From: "J. Oquendo" <sil@...iltrated.net>
To: Tavis Ormandy <taviso@....lonestar.org>, 
	full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: SSH brute force blocking tool

Tavis Ormandy wrote:
> On Mon, Nov 27, 2006 at 04:21:19PM -0500, gabriel rosenkoetter wrote:
>   
>> Mea culpa. Tavis's exploit doesn't so scary things, although he's
>> right you should really be doing a bit more sanitization of (evil)
>> user-supplied input, given that you're (insisting that you) run as
>> root.
>>     
>
> Gabriel, I was referring to this line:
>
> awk '!/#/ && /\./ && !a[$0]++
> {print "iptables -A INPUT -s "$1" -i eth0 -d '$ifaddr' -p TCP --dport 22
> -j REJECT"}' /etc/hosts.deny |\
> awk '/iptables/ && !/#/ && !/-s  -i/'|sh
>
> (note the |sh), $1 can be controlled by specially crafted attempted
> logins.
>
> Thanks, Tavis.
>
>   

That specially crafted attempt would be a HUGE raping of TCP/IP. How do 
you supposed it would be possible for someone to insert 0wn3ed or any 
other variable outside of an IP address?

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

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