bugtraq - Re: Windows DNS Cache Poisoning by Forwarder DNS Spoofing

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Message-ID: <20070418114118.GA2759@sentinelchicken.org>
Date: Wed, 18 Apr 2007 07:41:18 -0400
From: Tim <tim-security@...tinelchicken.org>
To: Makoto Shiotsuki <shio@...rim.or.jp>
Cc: bugtraq@...urityfocus.com
Subject: Re: Windows DNS Cache Poisoning by Forwarder DNS Spoofing

Hello Makoto,

> Thank you for the clarification, Tim.
> That is exactly what I wanted to say. :)
> 
> By the way, as regards recent Bind 9, birthday attack is much more
> difficult to conduct because even if the attacker sends multiple
> simultaneous recursive queries, Bind 9 aggregates these queries.

Aggregating queries would definitely help if you assume the attacker can
make recursive queries.  

However, it was my understanding (which could be completely wrong) that
BIND 9 reuses sockets for multiple queries, unlike previous versions,
and this makes spoofed attacks easier in another respect.  (Of course
this all has nothing to do with the Windows-specific flaw.)

> In addition, there is a patch written by Jinmei-san for Bind 9.4.0
> (current release) to randomize source ports.
> 
>   http://www.jinmei.org/bind-9.4.0-portpool.patch
>   http://member.wide.ad.jp/tr/wide-tr-dns-bind9-portpool-01.txt
>   (technical report from WIDE project in Japanese)

That's good, that at least someone is trying to do this in BIND.

thanks for the info,
tim