DNS Security: Protecting the Phonebook of Your Network

Every connection on your network begins with a DNS lookup. That makes DNS both a critical service and an attractive target. Attackers abuse it to redirect users, exfiltrate data, control malware and amplify DDoS attacks.

Key DNS threats

• Hijacking and cache poisoning: sending users to fake sites.
• DNS tunnelling: hiding data theft or command-and-control traffic inside DNS queries.
• Amplification: misusing open resolvers to flood third parties.
• Registrar and account takeover: changing your domain’s records at the source.

Hardening recursive resolvers

• Allow recursion only for your own users and customers.
• Enable DNSSEC validation.
• Use response policy zones (RPZ) to block known malicious domains.
• Apply response-rate limiting and monitor query volumes per client.
• Log queries and feed them into security monitoring.

Protecting authoritative DNS

• Sign your zones with DNSSEC.
• Use registrar lock and multi-factor authentication on registrar accounts.
• Run geographically diverse name servers.

DNS as a detection tool

Because almost all malware uses DNS, query logs are one of the richest sources for spotting infected devices early.

Ubixe Infotech secures DNS infrastructure for ISPs and enterprises. Learn about our DNS Security service or request a DNS review.