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Re: [Full-disclosure] SSH brute force blocking tool

from [J. Oquendo] Network Security [Permanent Link]
Subject: Re: [Full-disclosure] SSH brute force blocking tool
Date: Mon, 27 Nov 2006 16:41:43 -0500
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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