Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000001
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SRG-APP-000033
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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
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SRG-APP-000038
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SRG-APP-000089
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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 -
SRG-APP-000089
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SRG-APP-000111
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SRG-APP-000141
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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
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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
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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
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SRG-APP-000120
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SRG-APP-000125
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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
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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
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SRG-APP-000219
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Exchange internal Send connectors must use domain security (mutual authentication Transport Layer Security).
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-000219
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SRG-APP-000247
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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
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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
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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
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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
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SRG-APP-000247
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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
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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
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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
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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 -
SRG-APP-000247
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SRG-APP-000247
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The Exchange Internet Receive connector connections count must be set to default.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous inbound connections allowed t...Rule Low Severity -
SRG-APP-000247
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Exchange Message size restrictions must be controlled on Receive connectors.
Email system availability depends in part on best practices strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound...Rule Low Severity -
SRG-APP-000261
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Exchange messages with a blank sender field must be rejected.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group
Node 2
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