Subdomain takeover is a cybersecurity threat where attackers exploit unmonitored subdomains resulting from oversight in DNS settings. These attackers use dangling DNS records of inactive third-party services, hijacking legitimate subdomains for malicious activities such as phishing and malware distribution. Recently, this issue has gained considerable attention in Japan, particularly after notable incidents involving government domains in 2025. These events highlight a critical vulnerability where even trusted official URLs can direct users to unrelated and potentially harmful sites, severely damaging brand reputations.
The root of this threat lies in inadequate lifecycle management practices; organizations often neglect the removal of DNS records after decommissioning services. Except for temporary phishing sites, attackers use advanced techniques, optimizing campaigns based on user characteristics. Collision of convenience in cloud service management with poor security practices creates an environment ripe for exploitation. The need for comprehensive operational habits and technical safeguards is critical in addressing these risks effectively. Implementing formal procedures for DNS record management is crucial, as is inter-departmental coordination to ensure security across the organization.
👉 Pročitaj original: CIO Magazine
