DNS (Domain Name System) poisoning, also known as DNS spoofing or DNS cache poisoning, is a type of cyber attack that involves redirecting traffic from a legitimate website to a fake one. This can be done by modifying the DNS cache or by compromising a DNS server. DNS poisoning is a serious threat that can result in the theft of sensitive information, such as usernames and passwords, from unsuspecting users.
Where is this attack used?
DNS poisoning can be used in a variety of ways, including:
Phishing: Hackers can use DNS poisoning to redirect users to a fake website that looks similar to a legitimate one. They can then steal the user's login credentials or other sensitive information.
Eavesdropping: Hackers can use DNS poisoning to redirect traffic to a fake website, where they can intercept and capture data, such as passwords, credit card information, or personal details.
Denial-of-service attacks: DNS poisoning can also be used to launch a denial-of-service attack, where a website or network is flooded with traffic, rendering it unavailable to users.
Why use this attack?
DNS poisoning is a popular attack method because it is relatively easy to execute and can be highly effective. By redirecting users to a fake website, hackers can trick them into providing sensitive information or downloading malware. DNS poisoning can also be used to steal login credentials or launch a denial-of-service attack, which can have serious consequences for businesses and individuals.
Types of DNS Poisoning:
There are two main types of DNS poisoning:
Client-side DNS poisoning: In this type of attack, the DNS cache on the user's computer is modified to redirect traffic to a fake website.
Server-side DNS poisoning: In this type of attack, the DNS cache on the server is modified to redirect traffic to a fake website.
Methods of DNS Poisoning:
DNS poisoning can be carried out in several ways, including:
DNS cache poisoning: Hackers can inject false information into the DNS cache, redirecting traffic to a fake website.
Man-in-the-middle attacks: In this type of attack, the hacker intercepts traffic between the user and the legitimate website, and redirects it to a fake website.
DNS spoofing: Hackers can create a fake DNS server that masquerades as a legitimate one, and redirect traffic to a fake website.
How to secure from this attack?
There are several measures that can be taken to protect against DNS poisoning:
Use secure DNS servers: Use DNS servers that are secure and trusted.
Implement DNSSEC: DNSSEC is a security protocol that adds an additional layer of protection to the DNS system, making it more difficult to carry out DNS poisoning attacks.
Use a firewall: A firewall can be used to block traffic from untrusted sources, preventing DNS poisoning attacks.
Keep software up-to-date: Keep all software up-to-date with the latest security patches and updates.
Educate employees: Educate employees on the dangers of phishing and social engineering attacks, and provide them with guidelines on how to protect themselves.
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