HomesecurityDNS attacks: What are the attacks and how do they work?

DNS attacks: What are the attacks and how do they work?

Today this Internet is an integral part of our lives. Most of us now use it on a daily basis, not only for fun and entertainment, but also for doing business. The dangers are endless and many times they are not even able to avoid large and organized companies, even falling victim to them. hacking. That's why cybersecurity should be a primary concern for all users, whether they are individuals or represent large companies. Today we will analyze the DNS attacks (Domain Name System).

DNS attacks

DNS attack is a type of Internet attack that exploits weaknesses or defects in the domain name system. At this point in order to understand how DNS attacks work, we first need to understand how DNS itself works.

DNS is a protocol that interprets one domain name to an IP address. That is, it converts a user-friendly domain into a computer-friendly IP address.

In practice when someone types a domain into browser, a program known as a DNS resolver searches for the IP address of that domain. The DNS resolver searches for its own local cache and checks if it already has the IP address for that domain. If it does not find it in the local cache, it asks a DNS server to check if it knows the exact IP address for that domain. DNS servers are able to find out which server knows the domain IP address. 

Although the Domain Name System is quite powerful, it does not focus on security. So there are different types of DNS attacks. 

Now let's see how hackers exploit DNS. At any account a hacker can replace the actual IP address of one website with a false one so the user does not know that he is trying to access the wrong address. 

DNS attacks

In recent years there has been an increase in DNS attacks and this is not just for small sites. Many times famous websites like Twitter or Spotify, have also fallen victim to these attacks. Some of the types of attacks we will see below:

  • Zero-day attack: In this case the hacker exploits a hitherto unknown vulnerability of the DNS server.
  • Fast Flux DNS: The main idea behind this inspiration is to have many IP addresses connected to a domain, where they will be transmitted at a very high frequency through changing DNS records. 
  • DNS-Spoofing: Hackers configure the entire DNS server by replacing the IP address with a false one. This is also the most popular fishing technique used.

The attack DDoS it was named after the Distributed Denial of Service. A DDoS attack can destroy the entire DNS server and cause users to have no internet access. 

DNS attacks are definitely a huge security issue. That is why businesses need to be taken seriously.

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