I - Mission Critical Public
Rules and Groups employed by this XCCDF Profile
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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 Medium Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange send connectors delivery retries must be controlled.
<VulnDiscussion>This setting controls the rate at which delivery attempts from the home domain are retried and user notifications are issued ...Rule Medium Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange receive connectors must be clearly named.
<VulnDiscussion>For receive connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, tro...Rule Medium Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
Exchange receive connectors must control the number of recipients chunked on a single message.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. For message size res...Rule Medium Severity -
SRG-APP-000247
<GroupDescription></GroupDescription>Group -
The Exchange internet receive connector connections count must be set to default.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration c...Rule Medium 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 practices strategies for setting tuning configurations. For message size re...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Active hyperlinks in messages from non .mil domains must be rendered unclickable.
<VulnDiscussion>Active hyperlinks within an email are susceptible to attacks of malicious software or malware. The hyperlink could lead to a ...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange messages with a blank sender field must be rejected.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange messages with a blank sender field must be filtered.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange filtered messages must be archived.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange sender filter must block unaccepted domains.
<VulnDiscussion>Spam origination sites and other sources of suspected email-borne malware have the ability to corrupt, compromise, or otherwi...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange nonexistent recipients must not be blocked.
<VulnDiscussion>Spam originators, in an effort to refine mailing lists, sometimes use a technique where they first create fictitious names an...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Sender Reputation filter must be enabled.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Sender Reputation filter must identify the spam block level.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange Attachment filtering must remove undesirable attachments by file type.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated fr...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Spam Evaluation filter must be enabled.
<VulnDiscussion>By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages may be eliminated...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Block List service provider must be identified.
<VulnDiscussion>Block List filtering is a sanitization process performed on email messages prior to their arrival at the destination mailbox....Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
Exchange messages with a malformed From address must be rejected.
<VulnDiscussion>Sender Identification (SID) is an email anti-spam sanitization process. Sender ID uses DNS MX record lookups to verify the Si...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Recipient filter must be enabled.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduc...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange tarpitting interval must be set.
<VulnDiscussion>Tarpitting is the practice of artificially delaying server responses for specific Simple Mail Transfer Protocol (SMTP) commun...Rule Medium 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 Simple Mail Transfer Protocol (SMTP) IP Allow List entries must be empty.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduc...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List Connection filter must be enabled.
<VulnDiscussion>Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduc...Rule Medium Severity -
SRG-APP-000261
<GroupDescription></GroupDescription>Group -
The Exchange Simple Mail Transfer Protocol (SMTP) Sender filter must be enabled.
<VulnDiscussion>Email system availability depends in part on best practices strategies for setting tuning configurations. Careful tuning redu...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
Node 2
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