Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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Exchange Mailbox databases must reside on a dedicated partition.
In the same way that added security layers can provide a cumulative positive effect on security posture, multiple applications can provide a cumulative negative effect. A vulnerability and subseque...Rule Medium Severity -
Exchange Internet-facing Send connectors must specify a Smart Host.
When identifying a "Smart Host" for the email environment, a logical Send connector is the preferred method. A Smart Host acts as an Internet-facing concentrator for other email servers. Appropria...Rule Medium Severity -
Exchange internal Receive connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) Receive connector is used by Exchange to send and receive messages from server to server using SMTP protocol. This setting controls the encryption strength ...Rule Medium Severity -
Exchange Mailboxes must be retained until backups are complete.
Backup and recovery procedures are an important part of overall system availability and integrity. Complete backups reduce the chance of accidental deletion of important information and make it pos...Rule Medium Severity -
Exchange email forwarding must be restricted.
Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Information (CUI) and Personally Identifiable Information (PII) in accordan...Rule Medium Severity -
Exchange email-forwarding SMTP domains must be restricted.
Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Information (CUI) and Personally Identifiable Information (PII) in accordan...Rule Medium Severity -
Exchange Mail quota settings must not restrict receiving mail.
Mail quota settings control the maximum sizes of a user’s mailbox and the system’s response if these limits are exceeded. Mailbox data that is not monitored against a quota increases the risk of ma...Rule Low Severity -
Exchange Mail Quota settings must not restrict receiving mail.
Mail quota settings control the maximum sizes of a user’s mailbox and the system’s response if these limits are exceeded. Mailbox data that is not monitored against a quota increases the risk of ma...Rule Low Severity -
Exchange Mailbox Stores must mount at startup.
Administrator responsibilities include the ability to react to unplanned maintenance tasks or emergency situations that may require Mailbox data manipulation. Occasionally, there may be a need to s...Rule Low Severity -
Exchange Message size restrictions must be controlled on Receive connectors.
Email system availability depends in part on best practice strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound ...Rule Low Severity -
Exchange Receive connectors must control the number of recipients per message.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of recipients who will receive a copy of a ...Rule Low Severity -
The Exchange Receive Connector Maximum Hop Count must be 60.
Email system availability depends in part on best practice strategies for setting tuning configurations. This setting controls the maximum number of hops (email servers traversed) a message may tak...Rule Low Severity -
Exchange Message size restrictions must be controlled on Send connectors.
Email system availability depends in part on best practice strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound ...Rule Low Severity -
The Exchange global outbound message size must be controlled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Message size limits should be set to 10 megabytes (MB) at most but often are smaller, depend...Rule Low Severity -
The Exchange Outbound Connection Timeout must be 10 minutes or less.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the number of idle minutes before the connection is dropped. It ...Rule Low Severity -
Exchange external/Internet-bound automated response messages must be disabled.
Spam originators, in an effort to refine mailing lists, sometimes monitor transmissions for automated bounce-back messages. Automated messages include such items as "Out of Office" responses, nonde...Rule Medium Severity -
Exchange servers must have an approved DoD email-aware virus protection software installed.
With the proliferation of trojans, viruses, and spam attaching themselves to email messages (or attachments), it is necessary to have capable email-aware anti-virus (AV) products to scan messages a...Rule High Severity -
The Exchange Global Recipient Count Limit must be set.
Email system availability depends in part on best practice strategies for setting tuning configurations. The Global Recipient Count Limit field is used to control the maximum number of recipients t...Rule Low Severity -
An Exchange software baseline copy must exist.
Exchange software, as with other application software installed on a host system, must be included in a system baseline record and periodically reviewed; otherwise, unauthorized changes to the soft...Rule Medium Severity -
Exchange software must be monitored for unauthorized changes.
Monitoring software files for changes against a baseline on a regular basis may help detect the possible introduction of malicious code on a system.Rule Medium Severity -
Exchange services must be documented and unnecessary services must be removed or disabled.
Unneeded but running services offer attackers an enhanced attack profile, and attackers are constantly watching to discover open ports with running services. By analyzing and disabling unneeded ser...Rule Medium Severity -
The Exchange Email application must not share a partition with another application.
In the same way that added security layers can provide a cumulative positive effect on security posture, multiple applications can provide a cumulative negative effect. A vulnerability and subseque...Rule Medium Severity -
The Exchange SMTP automated banner response must not reveal server details.
Automated connection responses occur as a result of FTP or Telnet connections when connecting to those services. They report a successful connection by greeting the connecting client and stating th...Rule Medium Severity -
Exchange Internal Send connectors must use an authentication level.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. Several controls work together to provide security between internal server...Rule Medium Severity -
Exchange must provide Mailbox databases in a highly available and redundant configuration.
Exchange Server mailbox databases and any data contained in those mailboxes should be protected. This can be accomplished by configuring Mailbox servers and databases for high availability and site...Rule Medium Severity -
The application must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including STIGs, NSA configuration guides, CTOs, and DTMs.
Configuring the application to implement organization-wide security implementation guides and security checklists ensures compliance with Federal standards and establishes a common security baselin...Rule Medium Severity -
Exchange must use encryption for Outlook Web App (OWA) access.
This setting controls whether client machines should be forced to use secure channels to communicate with this virtual directory. If this feature is enabled, clients will only be able to communicat...Rule Medium Severity -
Exchange must have forms-based authentication disabled.
Identification and Authentication provide the foundation for access control. Access to email services applications in the DoD requires authentication using DoD Public Key Infrastructure (PKI) certi...Rule Medium Severity
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