Exchange Sender Identification Framework must be enabled.

From MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide

Associated with: CCI-001308

SV-84529r1_rule Exchange Sender Identification Framework must be enabled.

Vulnerability discussion

Email is only as secure as the recipient. When the recipient is an email server accepting inbound messages, authenticating the sender enables the receiver to better assess message quality and to validate the sending domain as authentic. One or more authentication techniques used in combination can be effective in reducing spam, phishing, and forger attacks. The Sender ID Framework (SIDF) receiver accesses specially formatted DNS records (SPF format) that contain the IP address of authorized sending servers for the sending domain that can be compared to data in the email message header. Receivers are able to validate the authenticity of the sending domain, helping to avoid receiving inbound messages from phishing or other spam domains.

Check content

Open the Exchange Management Shell and enter the following command: Get-SenderIdConfig | Select Name, Identity, Enabled If the value of Enabled is not set to True, this is a finding.

Fix text

Open the Exchange Management Shell and enter the following command: Set-SenderIdConfig -Enable $true

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