Welllll.... Ive done a lot of looking around and I just dont see any
solution to this issue. Im not concerned with DoS attacks, those i could
deal with. Im concerned for the stunningly stealthy 5 or 6 NXDOMAIN
lookups from a scary actor. That kind of thing could transmit a small
amount of really damaging info. Or.. A company using this to monitor
each client with pings once a minute. The uses of this low rate
communications channel is Unbounded and truly scary.
I know this has been around a long time. Im sorry for my stunned
amazement, I just ran into this.
No matter how I rack my brain, I can't think of any way around this.
Short of a registry of every domain before they can be used. So nothing
should ever come up NXDOMAIN. Even then,, it will get abused.
Man, just when I thought I was happy with TLS 1.3 for DNS and DNSSEC.
Its just never ending.
On 10/1/2018 4:03 AM, Chris via Unbound-users 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/
