1. takeovers

This article describes an experiment aimed at finding domains likely vulnerable to DNS takeover, a well-known technique that can be used to steal decomissioned, but active domains.

In this experiment I will show how I was able to find with little effort more than 200 domains that could be theoretically taken over across different providers and parent domains by using data from a public search tool (SecurityTrails) and an open-source repository (can-i-take-over-dns).

Please note that I did not find any new vulnerabilities nor develop any sort of attack tools or techniques during this research. I just analyzed what was already there, not being responsible in any way for whatever damages could be caused by the usage of the methods described below.

cloudflare は除外したとある。awsdnsは vulnerableではないとの扱いだ。:ー)

Azure, NS1, Google Cloud が主なところらしい。

1.4. 2020

https://internet.watch.impress.co.jp/docs/event/1297384.html

1.5. 2018

もし、ドメイン名が他人にハイジャックされたら？　平成の記憶から学ぶ、その手口と対策

遠山孝 2018年12月7日 14:35

https://internet.watch.impress.co.jp/docs/event/1157248.html

DNSテイクオーバーを題材に～ランチのおともにDNS

1.5.1. 対策案

Lame Delegation Cleanup. Registrars

Nameserver Segregation. Providers

Detection & Response. Providers

Developing Awareness.

Vulnerable providers can warn customers explicitly when they try to remove a zone, 
informing them that they must remove the NS record at their registrar prior to removing the delegated zone.

Finally, about the title of the article -
 I did have lots of fun doing this, but I didn't really profit anything, 
so for now I just hope this article was instructive for readers and that this will inspire researchers, 
registrars and providers to think about the problem =)

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