DeepSec 2022 Talk: Melting the DNS Iceberg – Taking Over Your Infrastructure Kaminsky Style – Dipl.-Ing. Timo Longin BSc

Sanna/ September 7, 2022/ Conference/ 0 comments

What does DNS have in common with an iceberg? Both are hiding invisible dangers! Beneath an iceberg there is… even more ice. However, beneath the DNS there are hiding unexpected vulnerabilities! If you want to resolve a name via DNS, there are multiple open DNS resolvers all across the Internet. A commonly used open DNS resolver is Google’s resolver with the IP address 8.8.8.8. However, not every system is using such an open resolver. Hosting providers, ISPs and the like, are often using resolvers that are not directly accessible from the Internet. These are the so called “closed” resolvers. In my previous research “Forgot password? Taking over user accounts Kaminsky style,” I have unearthed critical vulnerabilities in DNS resolvers of web applications, but I haven’t shared a second thought about the fact that these

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