The best control to mitigate attacks that redirect Internet traffic to an unauthorized website is to perform domain name system (DNS) server security hardening. DNS servers are responsible for resolving domain names into IP addresses, and they are often targeted by attackers who want to manipulate or spoof DNS records to redirect users to malicious websites4. By applying security best practices to DNS servers, such as encrypting DNS traffic, implementing DNSSEC, restricting access and updating patches, the organization can reduce the risk of DNS hijacking attacks. A network-based firewall, user security awareness training and a strong password policy are also important controls, but they are not as effective as DNS server security hardening in preventing this specific type of attack. References:
* CISA Review Manual, 27th Edition, page 4021
* CISA Review Questions, Answers & Explanations Database - 12 Month Subscription