DNS Cache Snooping?

Jeff Lightner jlightner at water.com
Tue Jun 24 13:59:44 UTC 2008


Not sure you saw my original post - its not quoted below.

I'm not running views but its looking like I need to do so.  I had hoped
I'd be able to control with the internaldns ACL and adding
allow-recursion for that ACL.  

I see there is an additional-from-cache than can be disabled in an
external view.

-----Original Message-----
From: Adam Tkac [mailto:atkac at redhat.com] 
Sent: Tuesday, June 24, 2008 9:56 AM
To: Jeff Lightner
Cc: Baird, Josh; Paul Vixie; comp-protocols-dns-bind at isc.org
Subject: Re: Re: DNS Cache Snooping?

On Tue, Jun 24, 2008 at 09:34:57AM -0400, Jeff Lightner wrote:
> Thanks.  I'd pretty much come to that conclusion based on my searches.
> I guess that means the link even though it is on ISC's site is
> incorrect.
> FYI:  
> Current RHEL5 bind-chroot (and other bind packages) version is
> 9.3.4-6.P1.el5.   It was updated within the last month.  It includes a
> fix for CVE-2008-0122.   I had installed a new server a week or so ago
> and got this in the yum update.   Yesterday I updated my other server
> this version specifically because there was a scan hit on
> That scan was based on BIND version so would still peg this but the
> details at RHN confirm the fix was added by RedHat to the 9.3.4-6 P1.
> Does setting to max-cache-ttl instead to a low value help remediate
> DNS cache snooping? 


did you try set "recursion no;" in your external view? I didn't test
it but it might help.


Adam Tkac, Red Hat, Inc.
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