full-disclosure - Re: Exploiting Microsoft dynamic Dns updates

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Date: Tue, 3 Apr 2007 17:22:40 +0200
From: "Andres Tarasco" <atarasco@...il.com>
To: "Denis Jedig" <dj@...eticon.de>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: Re: Exploiting Microsoft dynamic Dns updates

Dear Denis,

As I told before, this feature/vulnerability related with dynamic dns
updates is known for a long time. My experience has demonstrated that this
weak configuration is very common and extended between most companies and
some of the attack vectors that I exposed were never considered as a threat.

I agree with you that Windows 2003 provides more security, but that's not
the default configuration with windows 2000 server.

I was not aware of nsupdate tool so I coded Dnsfun just as a proof of
concept (not as a high-sk1llz hacker tool). It helped me to test some
configuration issues.
If it also helps people to identify risky configurations then its enough for
me.

Andres Tarasco

2007/4/3, Denis Jedig <dj@...eticon.de>:
>
> On Thu, 22 Mar 2007 11:35:18 +0100 Andres Tarasco wrote:
>
> > By default, most Microsoft DNS servers integrated with active directory
> allow
> > insecure dynamic updates for dns records.
>
> This statement is way too broad. Creating an AD-integrated zone in Windows
> Server 2003 does create a "secure updates only" zone by default. You can
> influence this behavior in the zone creation wizard though.
>
> > dnsfun exploits that weak configuration and allows remote users to
> modify dns records.
>
> I am not sure if I do see the point in rewriting nsupdate from bindtools.
> I
> am also quite uncertain if this really might count as a "hacker" or
> "security" tool of any kind.
>
> --
> Denis Jedig
> syneticon networks GbR             http://syneticon.net/service/
>
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