III - Administrative Sensitive
Rules and Groups employed by this XCCDF Profile
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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-000231
Group -
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
Group -
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
Group -
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
Group -
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
Group -
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 -
SRG-APP-000246
Group -
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
Group -
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 -
SRG-APP-000247
Group -
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 -
SRG-APP-000247
Group -
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 -
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 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 -
The Exchange global inbound 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 -
SRG-APP-000247
Group -
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 -
SRG-APP-000247
Group -
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 -
SRG-APP-000247
Group -
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 -
SRG-APP-000261
Group -
Exchange servers must have an approved DOD email-aware virus protection software installed.
With the proliferation of trojans, viruses, and spam attaching themselves to email messages (or attachments), it is necessary to have capable email-aware antivirus (AV) products to scan messages an...Rule High Severity -
SRG-APP-000261
Group -
Exchange internal receive connectors must not allow anonymous connections.
This control is used to limit the servers that may use this server as a relay. If a Simple Mail Transport Protocol (SMTP) sender does not have a direct connection to the internet (for example, an a...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange external/internet-bound automated response messages must be disabled.
Spam originators, in an effort to refine mailing lists, sometimes monitor transmissions for automated bounce-back messages. Automated messages include such items as "Out of Office" responses, nonde...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have anti-spam filtering installed.
Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual up...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have anti-spam filtering enabled.
Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual up...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have anti-spam filtering configured.
Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A manual up...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must not send automated replies to remote domains.
Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Remote use...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Global Recipient Count Limit must be set.
Email system availability depends in part on best practice strategies for setting tuning configurations. The Global Recipient Count Limit field is used to control the maximum number of recipients t...Rule Low Severity -
SRG-APP-000272
Group -
Exchange antimalware agent must be enabled and configured.
Microsoft Exchange 2019 offers built-in antimalware protection for messages going through the transport pipeline. When enabled, the default settings are configured to automatically update. Exchang...Rule Medium Severity
Node 2
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