9: Email and Web Browser Protections

CSF v1.1 References:

PF v1.0 References:

Control Statement

Improve protections and detections of threats from email and web vectors, as these are opportunities for attackers to manipulate human behavior through direct engagement.

[csf.tools Note: For more information on the Critical Security Controls, visit the Center for Internet Security.]


9.3: Maintain and Enforce Network-Based URL Filters

Enforce and update network-based URL filters to limit an enterprise asset from connecting to potentially malicious or unapproved websites. Example implementations include category-based filtering, reputation-based filtering, or through the use of block lists. Enforce filters for all enterprise assets.

9.5: Implement DMARC

To lower the chance of spoofed or modified emails from valid domains, implement DMARC policy and verification, starting with implementing the Sender Policy Framework (SPF) and the DomainKeys Identified Mail (DKIM) standards.