Re: [Full-disclosure] DNS bind attacks

[Jeffrey Walton <noloader@xxxxxxxxx>]

What's the query. Could it be related to
http://www.isc.org/software/bind/advisories/cve-2011-4313?

On Thu, Jan 26, 2012 at 6:35 AM, J. von Balzac <jhm.balzac@xxxxxxxxx> wrote:
> I'm seeing a lot of hosts in my named logs (I mean log files, it's not
> like I am naming my poop)
>
> ...ok... silly joke hehe
>
> So anyway, named bind is reporting a lot of denied queries of type
> 'isc.org/ANY/IN'. I'm not looking for a solution - I have one (which
> is to immediately block the IPs for port 53 after as few as one denied
> query) - but I want to warn server admins who haven't spotted both
> these queries and other denied queries.
>
> Common sense suggests that these hosts are probably spoofed IPs. Looks
> like an effective way to ddos a host: request an arbitrary DNS record
> with a spoofed IP and let the server reply to the spoofed IP in
> whatever way. Do that with many hosts and there is your denial of
> service.
>
> A side effect is that when you block the IP, you're blocking something
> that isn't really doing anything wrong as it's a spoofed IP
>
> But ok, I'm not too sure of this so please shoot holes in my theory or
> suggest better fixes/workarounds/...
>
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/