System And Information Integrity
Implement email forgery protections.
Implement email protections in addition to basic spam protections. Some potential advanced email protections include Sender Policy Framework (SPF) ,Domain Keys Identified Mail (DKIM), and Domain-based Message Authentication, Reporting & Conformance (DMARC). SPF uses DNS to show which servers are allowed to send email for a given domain. DKIM uses asymmetric cryptography to verify the authenticity of an email message and provide assurance of the legitimacy of the email to the recipient. DMARC allows organizations to deploy a combination of DKIM and SPF to further enhance their electronic mail infrastructure by adding linkage to the author (“From:”) domain name, published policies for recipient handling of authentication failures, and reporting from receivers to senders, to improve and monitor protection of the domain from fraudulent email. Example As the email administrator for your organization, you want to add additional protections to ensure you are blocking as many unwanted and harmful emails as possible. You configure a DMARC policy that enables both SPF and DKIM on your domain. You configure an SPF text entry in your DNS configuration so that you explicitly authorize the servers that can send email as well as ensuring relevant outbound emails are signed using DKIM.
CMMC Protecting your environment from harmful emails is one of the best ways to reduce the risk of viruses and malware from entering your network. Email attacks are one of the primary attack vectors in use by threat actors today because of their simplicity and effectiveness for circumventing an organization’s perimeter defenses. Implementing advanced email protections can help mitigate these email-based threats from penetrating an organization’s defenses and landing in the inbox of organizational end users.
CIS Controls v7.1 7.8
NIST SP 800-53 Rev 4 SC-8
NIST CSF v1.1 PR.DS-2
CERT RMM v1.2 KIM:SG4.SP1
SI.3.219.[a] the organization implements email forgery protections.