Last year there was a "threat" by anonymous group to black out Internet by using DNS Reflection/Amplification attack against the Internet DNS Root servers. I even wrote a little article about it: "End of the world/Internet”
In the article I was questioning if this was even possible and what was needed as general interest and curiosity.
Well, looking at the "stophaus" attack last week, we are getting some answers.
I would say it is a real threat now and is a valid attack vector. Seems you only need a couple of ingredients:
Open recursive DNS servers
Many of these are already available, and numbers increase. This not only includes dedicated DNS Server systems, but also any equipment attached to the internet capable of handling DNS requests it seems (like cable-modems, routers, etc). So the risk this will be utilized again, will be greater every day now.
A party that is capable/willing do set it off
Seems that there are more and more parties on the Internet that open to "attack" certain entities on the Internet to defend their believes. In above case, stressing even the Internet and influence the usage of everyone on it.
Lets call it the "Internet", "Logistics" and "Bandwidth". Looking at the numbers, it is apparent that you need little (in context) and it is possible to do so if you want. Technology, services or other wise it is not really challenging. And it can be done not from a shady area/country either.
I suspect we will see more of this happening now the "proof-of-concept" is done. It still worries me when the real guns are pulled out and focus would shift from particular entities to the root infrastructure of the Internet.
I had a couple of talks with my expertise peers on this how to mitigate this, it is very difficult as it is sheer load coming from every corner of the Internet. We really did not come up with a single solution. Mitigation would probably mean "breaking" some parts of the Internet as collateral damage, which in size would probably be disruptive enough as well.
Main concern in this, again, is the "open resolvers" out there that we cannot control without education and regulation on how DNS is deployed (you know, the thing we are allergic/apathetic about on/about Internet).
The more thoughts I give this, the more I think the solution is not only technical but mostly an organisational/educational/regulation one… Before that is in place, we probably will experience some outages…
|Cybersquatting||Policy & Regulation|
|DNS Security||Registry Services|
|IP Addressing||White Space|
Minds + Machines