NXDOMAIN data leakage prevention

[Amanda Constant]

I am out of the office October 1st & 2nd and will respond to your message as quickly as possible once I return.

Amanda

On Oct 1, 2018, at 5:03 AM, Chris via Unbound-users <unbound-users at nlnetlabs.nl> wrote:

> I was reading a disturbing article on ways that DNS can be used to get data past firewalls and for malicious programs to communicate with a command and control center via DNS NXDOMAIN.
> 
> Right off hand I dont see a way to block this ? Looking at my NXDOMAIN lookups its quite pervasive and coming from a large number of sources. Its clearly being used by A LOT of people.
> 
> Is there a way I can use Unbound to mitigate this threat ? This is a serious issue because i don't see how to block this.
> 
> https://www.plixer.com/blog/detecting-malware/security-vendors-teaching-bad-actors-how-to-get-past-firewalls/
> 
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