II - Mission Support Sensitive
Rules and Groups employed by this XCCDF Profile
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SRG-APP-000213
<GroupDescription></GroupDescription>Group -
Exchange internet-facing send connectors must specify a smart host.
<VulnDiscussion>When identifying a "Smart Host" for the email environment, a logical Send connector is the preferred method. A Smart Host ac...Rule Medium Severity -
SRG-APP-000231
<GroupDescription></GroupDescription>Group -
Exchange mailboxes must be retained until backups are complete.
<VulnDiscussion>Backup and recovery procedures are an important part of overall system availability and integrity. Complete backups reduce th...Rule Medium Severity -
SRG-APP-000231
<GroupDescription></GroupDescription>Group -
Exchange email forwarding must be restricted.
<VulnDiscussion>Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Inf...Rule Medium Severity -
SRG-APP-000231
<GroupDescription></GroupDescription>Group -
Exchange email-forwarding SMTP domains must be restricted.
<VulnDiscussion>Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of Controlled Unclassified Inf...Rule Medium Severity -
SRG-APP-000246
<GroupDescription></GroupDescription>Group -
Exchange mailbox stores must mount at startup.
<VulnDiscussion>Administrator responsibilities include the ability to react to unplanned maintenance tasks or emergency situations that may r...Rule Low Severity -
SRG-APP-000246
<GroupDescription></GroupDescription>Group -
Exchange mail quota settings must not restrict receiving mail.
<VulnDiscussion>Mail quota settings control the maximum sizes of a user's mailbox and the system's response if these limits are exceeded. Mai...Rule Low Severity -
SRG-APP-000246
<GroupDescription></GroupDescription>Group -
Exchange mail quota settings must not restrict sending mail.
<VulnDiscussion>Mail quota settings control the maximum sizes of a user's mailbox and the system's response if these limits are exceeded. Mai...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange Message size restrictions must be controlled on Receive connectors.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. For message size res...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange Receive Connector Maximum Hop Count must be 60.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. This setting control...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange send connector connections count must be limited.
<VulnDiscussion>The Exchange Send connector setting controls the maximum number of simultaneous outbound connections allowed for a given SMTP...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange receive connectors must control the number of recipients per message.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange message size restrictions must be controlled on send connectors.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. For message size res...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange global inbound message size must be controlled.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. Message size limits ...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange global outbound message size must be controlled.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. Message size limits ...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange Outbound Connection Limit per Domain Count must be controlled.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration c...Rule Low Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange Outbound Connection Timeout must be 10 minutes or less.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration c...Rule Low Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange servers must have an approved DOD email-aware virus protection software installed.
<VulnDiscussion>With the proliferation of trojans, viruses, and spam attaching themselves to email messages (or attachments), it is necessary...Rule High Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange internal receive connectors must not allow anonymous connections.
<VulnDiscussion>This control is used to limit the servers that may use this server as a relay. If a Simple Mail Transport Protocol (SMTP) sen...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange external/internet-bound automated response messages must be disabled.
<VulnDiscussion>Spam originators, in an effort to refine mailing lists, sometimes monitor transmissions for automated bounce-back messages. A...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange must have anti-spam filtering installed.
<VulnDiscussion>Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam softwar...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange must have anti-spam filtering enabled.
<VulnDiscussion>Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam softwar...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange must have anti-spam filtering configured.
<VulnDiscussion>Originators of spam messages are constantly changing their techniques to defeat spam countermeasures; therefore, spam softwar...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange must not send automated replies to remote domains.
<VulnDiscussion>Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An a...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Global Recipient Count Limit must be set.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. The Global Recipient...Rule Low Severity -
SRG-APP-000272
<GroupDescription></GroupDescription>Group -
Exchange anti-malware agent must be enabled and configured.
<VulnDiscussion>Microsoft Exchange 2019 offers built-in anti-malware protection for messages going through the transport pipeline. When enabl...Rule Medium Severity
Node 2
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