The History of DNS Vulnerabilities and the Cloud


Every now and then, a new domain name system (DNS) vulnerability that puts billions of devices around the world at risk is discovered. DNS vulnerabilities are usually critical. Just imagine that you browse to your bank account website, but instead of returning the IP address of your bank website, your DNS resolver gives you the address of an attacker’s website. That website looks exactly the same as the bank’s website. Not only that, but even if you take a look at the URL bar, you won’t see anything wrong because your browser actually thinks this is the website of your bank. This is an example of DNS cache poisoning.

In this article, I will explain what DNS is as well as review the history of DNS cache poisoning vulnerabilities, from past vulnerabilities to more advanced ones that were discovered in recent years.

The vulnerabilities I chose to cover are the bread and butter of almost all DNS cache poisoning attacks that took place in the last 20 years.

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Source: Palo Alto