DNS cache poisoning attacks

[Alan Clegg]

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.net.
> "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