full-disclosure - Microsoft DNS resolver: deliberately sabotaged hosts-file lookup

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Message-ID: <011401c663c9$e0866c00$a600100a@zks.com>
Date: Wed Apr 19 18:22:58 2006
From: marioc at computer.org (Mario Contestabile)
Subject: Microsoft DNS resolver: deliberately sabotaged
	hosts-file lookup


Fyi, Any NT app can bypass the local hosts file using DnsQuery(...,...,
DNS_QUERY_NO_HOSTS_FILE, ...);




marioc@...puter.org
http://bubbler.net/outlaw/blog


 

-----Original Message-----
From: Joachim Schipper [mailto:j.schipper@...h.uu.nl] 
Sent: April 13, 2006 8:13 PM
To: full-disclosure@...ts.grok.org.uk; bugtraq@...urityfocus.com
Subject: Re: [Full-disclosure] Microsoft DNS resolver: deliberately
sabotaged hosts-file lookup

On Thu, Apr 13, 2006 at 06:29:15PM +0100, Dave Korn wrote:
> 
>   Hey, guess what I just found out:  Microsoft have deliberately 
> sabotaged their DNS client's hosts table lookup functionality.

> (...) I'd try to block (Windows Media Player) it in my hosts file.

>   Microsoft DNS client special-cases 'go.microsoft.com' and refuses to 
> look it up in the hosts file.

>   I'm running fully up-to-date Windows XP SP2.  I don't have any pfw 
> software that could conceivably be interfering, and the windows 
> firewall is running with more-or-less the default settings (I've only 
> added a couple of exceptions, no other changes).  I don't think this is a
false positive.