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Date: Wed, 29 Jul 2009 11:20:09 +0200
From: Nico Golde <oss-security+ml@...lde.de>
To: oss-security@...ts.openwall.com
Cc: Vincent Danen <vdanen@...hat.com>
Subject: Re: debian bug report on bind9 DoS
Hi,
* Robert Buchholz <rbu@...too.org> [2009-07-29 00:13]:
> On Tuesday 28 July 2009, Vincent Danen wrote:
> > I don't think
> > it's a huge problem with a well-secured bind9 configuration, but
> > could be quite problematic for bind config's that allow updates
> > without an RNDC key (typical of some dynamic DNS implementations), or
> > on a system that has lax enough permissions that the RNDC key is
> > exposed.
>
> The crash is not limited to configurations that allow updates.
Confirmed.
> The ISC advisory states so as well, and I could reproduce the DoS on a
> static named instance by removing the "$packet->sign_tsig(...)" line in
> the exploit. So the scope of this issue is wider than apparent from
> the original report.
Hmm I'd consider that a bug as well or is there a reason why
bind shouldn't verify update's authorization before
processing them?
Cheers
Nico
--
Nico Golde - http://www.ngolde.de - nion@...ber.ccc.de - GPG: 0xA0A0AAAA
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