Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Exchange email diagnostic log level must be set to the lowest level.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Diagnostic logging, however, characteristi...Rule Medium Severity -
Exchange audit record parameters must be set.
Log files help establish a history of activities and can be useful in detecting attack attempts. This item declares the fields that must be available in the audit log file to adequately research ev...Rule Low Severity -
The RBAC role for audit log management must be defined and restricted.
The RBAC role for the audit log management "Audit Log Role" should be defined in the Organizational or Enterprise Domain Security Plan (EDSP) to define the necessary personnel that are required to ...Rule Medium Severity -
Exchange email subject line logging must be disabled.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. When "message tracking" is enabled, only t...Rule Medium Severity -
Exchange message tracking logging must be enabled.
A message tracking log provides a detailed log of all message activity as messages are transferred to and from a computer running Exchange. If events are not recorded, it may be difficult or impos...Rule Medium Severity -
Exchange circular logging must be disabled.
Logging provides a history of events performed and can also provide evidence of tampering or attack. Failure to create and preserve logs adds to the risk that suspicious events may go unnoticed and...Rule Low Severity -
Exchange queue monitoring must be configured with threshold and action.
Monitors are automated "process watchers" that respond to performance changes and can be useful in detecting outages and alerting administrators where attention is needed. Exchange has built-in mon...Rule Medium Severity -
Exchange must protect audit data against unauthorized read access.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
Exchange must protect audit data against unauthorized deletion.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
Exchange audit data must be on separate partitions.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
Exchange local machine policy must require signed scripts.
Scripts often provide a way for attackers to infiltrate a system, especially scripts downloaded from untrusted locations. By setting machine policy to prevent unauthorized script executions, unanti...Rule Medium Severity -
Exchange Send Fatal Errors to Microsoft must be disabled.
It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and...Rule Medium Severity -
The Exchange Post Office Protocol 3 (POP3) service must be disabled.
POP3 is not approved for use within the DOD. It uses a clear-text-based user name and password and does not support the DOD standard for PKI for email access. User name and password could easily be...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 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 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 -
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 -
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 MB at most but often are smaller, depending on the o...Rule Low Severity -
The Exchange Outbound Connection Limit per Domain Count must be controlled.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous outbound connections from a d...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
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