The National Cybersecurity and Communications Integration Center (NCCIC), part of the Cybersecurity and Infrastructure Security Agency (CISA), is aware of a global Domain Name System (DNS) infrastructure hijacking campaign. Using compromised credentials, an attacker can modify the location to which an organization's domain name resources resolves. This enables the attacker to redirect user traffic to attacker-controlled infrastructure and obtain valid encryption certificates for an organization's domain names, enabling man-in-the-middle attacks.
NCCIC encourages administrators to read FireEye's blog on global DNS infrastructure hijacking for more information. Additionally, it is recommended that you follow the below best practices to help safeguard networks against this threat:
- Implement multifactor authentication on domain registrar accounts, or on other systems used to modify DNS records.
- Verify that DNS infrastructure (second-level domains, sub-domains, and related resource records) points to the correct Internet Protocol addresses or hostnames.
- Search for encryption certificates related to domains and revoke any malicious certificates.