II - Mission Support Sensitive
Rules and Groups employed by this XCCDF Profile
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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 Medium Severity -
SRG-APP-000247
Group -
The Exchange Internet Receive connector connections count must be set to default.
Email system availability depends in part on best practice strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous inbound connections allowed t...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 practices strategies for setting tuning configurations. For message size restrictions, multiple places exist to set or override inbound or outbound...Rule Low Severity -
SRG-APP-000261
Group -
Exchange messages with a blank sender field must be rejected.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange messages with a blank sender field must be filtered.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange filtered messages must be archived.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Sender filter must block unaccepted domains.
Spam origination sites and other sources of suspected email-borne malware have the ability to corrupt, compromise, or otherwise limit availability of email servers. Limiting exposure to unfiltered ...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange nonexistent recipients must not be blocked.
Spam originators, in an effort to refine mailing lists, sometimes use a technique where they first create fictitious names and then monitor rejected emails for non-existent recipients. Those not re...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Sender Reputation filter must be enabled.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Sender Reputation filter must identify the spam block level.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange Attachment filtering must remove undesirable attachments by file type.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server en...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Spam Evaluation filter must be enabled.
By performing filtering at the perimeter, up to 90 percent of spam, malware, and other undesirable messages may be eliminated from the transport message stream, preventing their entry into the Exch...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Block List service provider must be identified.
Block List filtering is a sanitization process performed on email messages prior to their arrival at the destination mailbox. By performing this process at the email perimeter, threats can be elimi...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange messages with malformed From address must be rejected.
Sender Identification (SID) is an email antispam sanitization process. Sender ID uses DNS MX record lookups to verify the Simple Mail Transfer Protocol (SMTP) sending server is authorized to send e...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Recipient filter must be enabled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange tarpitting interval must be set.
Tarpitting is the practice of artificially delaying server responses for specific Simple Mail Transfer Protocol (SMTP) communication patterns that indicate high volumes of spam or other unwelcome m...Rule Medium 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 Simple Mail Transfer Protocol (SMTP) IP Allow List entries must be empty.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Simple Mail Transfer Protocol (SMTP) IP Allow List Connection filter must be enabled.
Email system availability depends in part on best practice strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availab...Rule Medium Severity -
SRG-APP-000261
Group -
The Exchange Simple Mail Transfer Protocol (SMTP) Sender filter must be enabled.
Email system availability depends in part on best practices strategies for setting tuning configurations. Careful tuning reduces the risk that system or network congestion will contribute to availa...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have antispam filtering installed.
Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. Sp...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have antispam filtering enabled.
Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. Sp...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange must have antispam filtering configured.
Originators of spam messages are constantly changing their techniques in order to defeat spam countermeasures; therefore, spam software must be constantly updated to address the changing threat. A ...Rule Medium Severity -
SRG-APP-000261
Group -
Exchange Sender Identification Framework must be enabled.
Email is only as secure as the recipient. When the recipient is an email server accepting inbound messages, authenticating the sender enables the receiver to better assess message quality and to va...Rule Medium Severity -
SRG-APP-000378
Group -
The Exchange application directory must be protected from unauthorized access.
Default product installations may provide more generous access permissions than are necessary to run the application. By examining and tailoring access permissions to more closely provide the least...Rule Medium Severity
Node 2
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