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I - Mission Critical Sensitive

Rules and Groups employed by this XCCDF Profile

  • SRG-APP-000213

    <GroupDescription></GroupDescription>
    Group
  • Exchange internet-facing send connectors must specify a smart host.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;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.

    &lt;VulnDiscussion&gt;Microsoft Exchange 2019 offers built-in anti-malware protection for messages going through the transport pipeline. When enabl...
    Rule Medium Severity

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