Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000516
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SRG-APP-000014
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Exchange must use encryption for RPC client access.
This setting controls whether client machines are forced to use secure channels to communicate with the server. If this feature is enabled, clients will only be able to communicate with the server ...Rule Medium Severity -
SRG-APP-000014
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SRG-APP-000014
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SRG-APP-000027
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Exchange must have administrator audit logging enabled.
Unauthorized or malicious data changes can compromise the integrity and usefulness of the data. Automated attacks or malicious users with elevated privileges have the ability to effect change using...Rule Medium Severity -
SRG-APP-000033
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Exchange servers must use approved DOD certificates.
Server certificates are required for many security features in Exchange; without them, the server cannot engage in many forms of secure communication. Failure to implement valid certificates makes...Rule Medium Severity -
SRG-APP-000033
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SRG-APP-000038
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SRG-APP-000089
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SRG-APP-000089
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SRG-APP-000089
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SRG-APP-000090
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SRG-APP-000098
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SRG-APP-000098
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SRG-APP-000098
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SRG-APP-000111
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SRG-APP-000118
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SRG-APP-000119
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Exchange must protect audit data against unauthorized 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-000120
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SRG-APP-000125
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SRG-APP-000131
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SRG-APP-000141
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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-000141
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The Exchange Internet Message Access Protocol 4 (IMAP4) service must be disabled.
IMAP4 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 b...Rule Medium Severity -
SRG-APP-000141
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SRG-APP-000211
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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 -
SRG-APP-000213
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SRG-APP-000231
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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 -
SRG-APP-000231
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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 -
SRG-APP-000231
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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 -
SRG-APP-000246
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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 -
SRG-APP-000246
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SRG-APP-000246
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Exchange mail quota settings must not restrict sending 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 -
SRG-APP-000247
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SRG-APP-000247
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SRG-APP-000247
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The Exchange send connector connections count must be limited.
The Exchange Send connector 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 cons...Rule Low Severity -
SRG-APP-000247
Group
Node 2
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