DNS cache poisoning attacks

[EL MAAYATI Afaf]

Hello,
	The line " query-source address x port 53;" is already disabled;
And I'm running the new version (beta) of Bind:
#dig +short @192.168.2.3 ch version.bind txt
9.5.1b1



Best Regards, 

-----Original Message-----
From: Alan Clegg [mailto:Alan_Clegg at isc.org] 
Sent: Tuesday, August 26, 2008 1:12 AM
To: EL MAAYATI Afaf
Cc: bind-users at isc.org
Subject: Re: DNS cache poisoning attacks

EL MAAYATI Afaf wrote:
> Hello,
>             As recommended, I've upgraded my DNS server to the version
BIND 9.5.1b1 <http://www.isc.org/sw/bind/view?release=9.5.1b1> . But I
still have the message indicating that my server is still vulnerable 
>  
> # dig @192.168.2.3 +short porttest.dns-oarc.net txt
>
Porttest.y.x.w.v.u.t.s.r.q.p.o.n.m.l.k.j.i.h.g.f.e.d.c.b.a.pt.dns-oarc.n
et.
> "192.168.2.3 is POOR: 26 queries in 6.4 seconds from 1 ports with std
dev 0"
>  
> Is there anything that I've missed?

Do you have a line similar to:

   query-source address x port 53;

If so, change it to:

   query-source address x port *;

Or get rid of it completely.

If you don't have a line like this, you may have an issue with a
firewall that "un-randomizes" your queries.

The other thing that you may want to check is if you are actually
running the correct version of named.  Check using:

   dig +short @192.168.2.3 version.bind ch txt

AlanC