イ DNSキャッシュポイズニング DNSキャッシュポイズニングは、「DNSの対応表を書き換えて、偽のサイトに誘導する攻撃」 DNSは、ドメイン名(例:www.example.com)とIPアドレスを対応付ける仕組みです。DNSサーバは、「このドメイン名はこのIPアドレスです」という情報を持っています。DNSキャッシュポイズニングは、このDNSサーバの情報を攻撃者が書き換えてしまう攻撃です。その結果、正しいURLを入力しても、本物のWebサイトではなく、攻撃者が用意した偽のWebサイトに接続されてしまいます。今回の問題は、ドメイン名とIPアドレスの対応付けが書き換えられているので、DNSキャッシュポイズニングです。 DNS is a system that maps a domain name (for example, www.example.com) to an IP address. A DNS server stores information that links each domain name to its corresponding IP address. DNS cache poisoning is an attack in which an attacker rewrites the information stored in the DNS server. As a result, even if a user enters the correct URL, they are redirected to a fake website prepared by the attacker instead of the legitimate website. In this problem, the mapping between the domain name and the IP address was altered, so the attack is DNS cache poisoning. DNS cache poisoning is an attack that rewrites DNS mapping information to redirect users to malicious websites.
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