Full Disclosure: DNS and Checkpoint

From: imipak <imipak_at_gmail.com>
Date: Wed, 9 Jul 2008 15:00:39 +0100

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

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/
Received on Jul 09 2008