[nsp-sec] FW: Storm worm changing DNS resolver settings on victim system

[Florian Weimer]

* John Kristoff:

>> What would the next consequence be in the chain of consequences?
>> Jump to a different port?
>
> Difficult to say.  Would be hard for DNS to simply jump to another
> port though.

For Zlob, it's trivial, see <http://support.microsoft.com/kb/158474>,
under "DnsServerPort".  MacOS X supports "port" in /etc/resolv.conf,
so it's equally straightforward.  It's probably a good idea to do this
right now because it makes cleaning up more difficult.

So blocking DNS requests to non-ISP servers doesn't make that much
sense, but I'm relatively sure it will become standard industry
practice on consumer accounts. 8-/

-- 
Florian Weimer                <fweimer at bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99