full-disclosure - Re: SSH brute force blocking tool

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Message-ID: <20061128161621.GC31705@sdf.lonestar.org>
Date: Tue, 28 Nov 2006 16:16:21 +0000
From: Tavis Ormandy <taviso@...too.org>
To: "J. Oquendo" <sil@...iltrated.net>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>,
	Thierry Zoller <Thierry@...ler.lu>
Subject: Re: SSH brute force blocking tool

On Tue, Nov 28, 2006 at 04:02:36PM +0000, Tavis Ormandy wrote:
> On Tue, Nov 28, 2006 at 10:56:33AM -0500, J. Oquendo wrote:
> > Incorrect did you look at the fix? It isn't unsanitized as you state:
> 
> J, you have made an attempt to fix it, but is is not sufficient.
> 
> An attacker can still add arbitrary hosts to the deny list.

I notice you also havnt solved the local privilege escalation, this can
be abused by local users to gain root by attempting to login with the
username set to a valid passwd entry and then winning the race condition
by creating a symlink to the system passwd file (of course, there are
dozens of other attacks).

Thanks, Tavis.

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