I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000033
Group -
Exchange servers must use approved DoD certificates.
To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., networks, web servers, and web porta...Rule Medium Severity -
SRG-APP-000038
Group -
Exchange must have accepted domains configured.
Exchange may be configured to accept email for multiple domain names. This setting identifies the domains for which the server will accept mail. This check verifies the email server is not acceptin...Rule Medium Severity -
SRG-APP-000038
Group -
Exchange external Receive connectors must be domain secure-enabled.
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 -
SRG-APP-000089
Group -
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 -
SRG-APP-000089
Group -
Exchange Connectivity logging must be enabled.
A connectivity log is a record of the SMTP connection activity of the outbound message delivery queues to the destination mailbox server, smart host, or domain. Connectivity logging is available on...Rule Medium Severity -
SRG-APP-000111
Group -
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 -
SRG-APP-000141
Group -
Exchange must not send Customer Experience reports to Microsoft.
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 -
SRG-APP-000118
Group -
Exchange Audit data must be protected against unauthorized access (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 -
SRG-APP-000141
Group -
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 -
SRG-APP-000119
Group -
Exchange audit data must be protected against unauthorized access for modification.
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 -
SRG-APP-000120
Group -
Exchange audit data must be protected against unauthorized access for 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 -
SRG-APP-000125
Group -
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 -
SRG-APP-000131
Group -
The Exchange local machine policy must require signed scripts.
Scripts, especially those downloaded from untrusted locations, often provide a way for attackers to infiltrate a system. By setting machine policy to prevent unauthorized script executions, unantic...Rule Medium Severity -
SRG-APP-000213
Group -
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 -
SRG-APP-000219
Group -
Exchange Internet-facing Receive connectors must offer Transport Layer Security (TLS) before using basic authentication.
Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. TLS is designed to protect confidentiality and data integrity by encrypting email message...Rule Medium Severity -
SRG-APP-000247
Group -
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 Medium Severity -
SRG-APP-000247
Group -
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 Medium Severity -
SRG-APP-000247
Group -
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 at most but often are smaller, depending o...Rule Low Severity -
SRG-APP-000247
Group -
Exchange Send connector connections count must be limited.
This setting controls the maximum number of simultaneous outbound connections allowed for a given SMTP Connector and can be used to throttle the SMTP service if resource constraints warrant it. If ...Rule Low Severity -
SRG-APP-000247
Group -
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 -
SRG-APP-000247
Group -
Exchange Send connectors delivery retries must be controlled.
This setting controls the rate at which delivery attempts from the home domain are retried and user notifications are issued and notes the expiration time when the message will be discarded. If ...Rule Low Severity -
SRG-APP-000247
Group -
Exchange Send connectors must be clearly named.
For Send connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be made ...Rule Low Severity -
SRG-APP-000247
Group -
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 Medium Severity -
SRG-APP-000247
Group -
Exchange Receive connectors must be clearly named.
For receive connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be ma...Rule Low Severity -
SRG-APP-000247
Group -
Exchange Receive connectors must control the number of recipients chunked on a single message.
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
Node 2
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