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Re: DNS and Checkpoint
From: "Sandro Gauci" <sandro () enablesecurity com>
Date: Thu, 10 Jul 2008 10:07:28 +0200

The question is - is this feature (src port randomization) enabled by
default?

On Thu, Jul 10, 2008 at 9:00 AM, Deniz Cevik <Deniz.Cevik () intellect com tr>
wrote:

 Yes, enable this feature at see what will happen. This check sometimes
drop valid dns request.


 ------------------------------

*From:* full-disclosure-bounces () lists grok org uk [mailto:
full-disclosure-bounces () lists grok org uk] *On Behalf Of *Ray P
*Sent:* Thursday, July 10, 2008 4:35 AM
*To:* imipak; Full Disclosure
*Subject:* Re: [Full-disclosure] DNS and Checkpoint



The article you're looking at is for their SmartDefense product, an add-in
to Firewall-1. Supposedly it will protect a DNS server behind the firewall
from this vulnerability.

Ray

Date: Wed, 9 Jul 2008 15:00:39 +0100
From: imipak () gmail com
To: full-disclosure () lists grok org uk
Subject: [Full-disclosure] DNS and Checkpoint

Hello everyone,

I've had a report from someone with clue (and tcpdump) that a properly
functioning DNS resolver that correctly uses randomised source ports
magically becomes vulnerable once the traffic's passed through a
Checkpoint firewall, where Dan Kaminsky's tool shows:

x.y.z.155:56978 TXID=712
x.y.z.155:56979 TXID=45713
x.y.z.155:56980 TXID=63532
x.y.z.155:56981 TXID=7243
x.y.z.155:56982 TXID=17620

(note the incrementing port numbers.)

Can anyone else confirm this behaviour?

Checkpoint are one of the dozens of vendors listed on the CERT
advisory as "Status: Unknown"
http://www.kb.cert.org/vuls/id/MIMG-7ECL6B

They do have an advisory up:

http://www.checkpoint.com/defense/advisories/public/2008/cpai-01-Jul.html

I don't have the login needed to read the whole thing, but the front
page just says:

"Protection provided by:
VPN-1: * NGX R65
* NGX R62
* NGX R61
* NGX R60
[...etc, etc...] "


cheers

=i

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_______________________________________________
Full-Disclosure - We believe in it.
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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