full-disclosure - Re: SSH brute force blocking tool

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Date: Mon, 27 Nov 2006 22:04:49 +0000
From: Tavis Ormandy <taviso@...too.org>
To: "J. Oquendo" <sil@...iltrated.net>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: SSH brute force blocking tool

On Mon, Nov 27, 2006 at 04:55:46PM -0500, J. Oquendo wrote:
> No it can't. Even if it was rm -rf someone placed in, did you not notice 
> my grep statement? Only print items with a decimal. At no given point 
> anywhere on the 13th column whether its Solaris, NetBSD, FreeBSD, would 
> there be an option for someone to craft anything...

J, I realise this is a difficult issue to grasp, but stick with it. 

Let's say that a ficticious log entry looks like this:

DATE ERROR USERNAME ADDRESS PORT

And let's say you're trying to print column 4 to get the address.

Here's an example:

Monday INVALID foobar 123.123.123.123 1024

You print $4 and get 123.123.123.123, excellent. Now lets try logging in
as "foo bar".

Monday INVALID foo bar 123.123.123.123 1024

Whats in $4 now? That's right, attacker controlled data.

> I'll give you addresses if you'd like to take a shot at it.

Sure, send them to the list, there are bound to be some takers.

Thanks, Tavis.

-- 
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taviso@....lonestar.org | finger me for my pgp key.
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