full-disclosure - Re: SSH brute force blocking tool

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Message-ID: <20061127213406.GA10259@uriel.eclipsed.net>
Date: Mon, 27 Nov 2006 16:34:06 -0500
From: gabriel rosenkoetter <gr@...ipsed.net>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: SSH brute force blocking tool

On Mon, Nov 27, 2006 at 09:29:33PM +0000, Tavis Ormandy wrote:
> 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.

Aha.

Yep, sure can!

I couldn't find where the malicious input was actually executed, but
I didn't spend long looking.

I take back my take back.

-- 
gabriel rosenkoetter
gr@...ipsed.net

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