Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000014
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SchUseStrongCrypto must be enabled.
Exchange Server 2019 is configured by default with TLS 1.2. However, SchUseStrongCrypto is not set by default and must be configured to meet the TLS requirement. The strong cryptography (configured...Rule Medium Severity -
SRG-APP-000033
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SRG-APP-000038
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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-000065
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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
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-000098
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SRG-APP-000111
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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-000119
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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
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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 -
SRG-APP-000141
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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-000211
Group -
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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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-000246
Group -
More than one Edge server must be deployed.
To ensure hostile insiders are unable to easily commit DoS attacks and reduce the effectiveness of mail flow throughout the environment, a second Edge server is deployed to allow for multiple paths...Rule Medium Severity -
SRG-APP-000247
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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
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
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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 Medium 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 Medium Severity -
SRG-APP-000247
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SRG-APP-000247
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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 d...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 Medium 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 Medium Severity -
SRG-APP-000247
Group -
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 Medium Severity
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