North American Network Operators Group
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Re: SANS: DNS Bug Now Public?

  • From: Joe Abley
  • Date: Wed Jul 23 14:20:33 2008

On 23 Jul 2008, at 12:16, Jorge Amodio wrote:

Let me add that folks need to understand that the "patch" is not a fix to a
problem that has been there for long time and
it is just a workaround to reduce the chances for a potential
attack, and it must be combined with best practices and
recommendations to implent a more robust DNS setup.

Having just seen some enterprise types spend time patching their nameservers, it's also perhaps worth spelling out that "patch" in this case might require more than upgrading resolver code -- it could also involve reconfigurations, upgrades or replacements of NAT boxes too. If your NAT reassigns source ports in a predictable fashion, then no amount of BIND9 patching is going to help.

(Reconfiguring your internal resolvers to forward queries to an external, patched resolver which can see the world other than through NAT-coloured glasses may also be a way out.)


Joe