What is DNS Security?
A security layer that analyzes and filters DNS queries and responses to block connections to malicious domains, prevent DNS-based data exfiltration, and disrupt command-and-control communications.
DNS is the first step in nearly every network connection, making it an ideal enforcement point. DNS security works by intercepting DNS queries from endpoints, evaluating the requested domain against threat intelligence feeds and real-time classification models, and blocking or redirecting queries to known-malicious, newly-registered, or algorithmically-generated domains. Because DNS resolution happens before a TCP connection is established, threats can be blocked before any payload is delivered.
In a SASE context, DNS security is typically the lightest-weight inspection layer and often the first to be deployed. It provides immediate risk reduction with minimal performance impact and no TLS inspection complexity. Some SASE platforms route all DNS queries through their PoPs for analysis, while others deploy local DNS resolvers on the endpoint agent that apply filtering locally with cloud-synchronized policies.
DNS-based data exfiltration (DNS tunneling) is a specific threat that DNS security addresses. Attackers encode stolen data in DNS queries to attacker-controlled authoritative servers, bypassing firewalls and proxies that typically allow DNS traffic unconditionally. Advanced DNS security solutions detect tunneling by analyzing query entropy, payload size, query frequency, and record type patterns to identify anomalous DNS behavior indicative of exfiltration.
A cloud or on-premises proxy that inspects all web-bound traffic for malware, enforces URL filtering policies, and prevents data exfiltration over HTTP/HTTPS.
The security half of SASE, delivering SWG, CASB, ZTNA, and DLP as cloud-delivered services without the SD-WAN networking component.
Curated, actionable information about current and emerging threats, including indicators of compromise (IoCs), attacker tactics, techniques, and procedures (TTPs), and contextual analysis that informs security decisions.
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