full-disclosure - Re: SSH brute force blocking tool

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Date: Tue, 28 Nov 2006 08:52:36 +0100
From: Tonnerre Lombard <tonnerre.lombard@...roup.ch>
To: gabriel rosenkoetter <gr@...ipsed.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: SSH brute force blocking tool

Salut,

On Mon, 2006-11-27 at 16:21 -0500, gabriel rosenkoetter wrote:
> Nope, I'm wrong, just the literal string "`/sbin/halt`", which you
> never exec.

Well, he does in the iptables command

> 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.

Another nice use of this vulnerability is of course the possibility to
blacklist arbitrary IPs (even better: if you have DNS for your local
names, or mDNS, you can e.g. blacklist the workstation of the admin so
he can't log in anymore)

				Tonnerre
-- 
SyGroup GmbH
Tonnerre Lombard

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Tel:+41 61 333 80 33    Röschenzerstrasse 9
Fax:+41 61 383 14 67    4153 Reinach BL
Web:www.sygroup.ch      tonnerre.lombard@...roup.ch

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