DNS and Checkpoint

[imipak <imipak () gmail com>]

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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