MS Exchange 2013 Edge Transport Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-APP-000001
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Exchange must limit the Receive connector timeout.
Email system availability depends in part on best practices strategies for setting tuning. This configuration controls the number of idle minutes before the connection is dropped. It works in conju...Rule Medium Severity -
Exchange servers must use approved DoD certificates.
To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., networks, web servers, and web porta...Rule Medium Severity -
Exchange external Receive connectors must be domain secure-enabled.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. Several controls work together to provide security between internal server...Rule Medium Severity -
The Exchange email Diagnostic log level must be set to the lowest level.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Diagnostic logging, however, characteristi...Rule Medium Severity -
Exchange must not send Customer Experience reports to Microsoft.
It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and...Rule Medium Severity -
Exchange audit data must be protected against unauthorized access for deletion.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
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 Medium Severity -
Exchange Send connectors delivery retries must be controlled.
This setting controls the rate at which delivery attempts from the home domain are retried and user notifications are issued and notes the expiration time when the message will be discarded. If ...Rule Low Severity -
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 Medium Severity -
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 -
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 -
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 -
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 -
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 -
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 -
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 -
Exchange services must be documented and unnecessary services must be removed or disabled.
Unneeded but running services offer attackers an enhanced attack profile, and attackers are constantly watching to discover open ports with running services. By analyzing and disabling unneeded ser...Rule Medium Severity -
The Exchange SMTP automated banner response must not reveal server details.
Automated connection responses occur as a result of FTP or Telnet connections when connecting to those services. They report a successful connection by greeting the connecting client and stating th...Rule Medium Severity -
Exchange internal Send connectors must use an authentication level.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. Several controls work together to provide security between internal server...Rule Medium Severity -
Exchange internal Send connectors must require encryption.
The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. Several controls work together to provide security between internal server...Rule High Severity -
SRG-APP-000033
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SRG-APP-000038
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Exchange must have accepted domains configured.
Exchange may be configured to accept email for multiple domain names. This setting identifies the domains for which the server will accept mail. This check verifies the email server is not acceptin...Rule Medium Severity -
SRG-APP-000038
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SRG-APP-000089
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SRG-APP-000089
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Exchange Connectivity logging must be enabled.
A connectivity log is a record of the SMTP connection activity of the outbound message delivery queues to the destination mailbox server, smart host, or domain. Connectivity logging is available on...Rule Medium Severity -
SRG-APP-000111
Group -
Exchange Queue monitoring must be configured with threshold and action.
Monitors are automated "process watchers" that respond to performance changes and can be useful in detecting outages and alerting administrators where attention is needed. Exchange has built-in mon...Rule Medium Severity -
SRG-APP-000141
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SRG-APP-000383
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SRG-APP-000118
Group -
Exchange Audit data must be protected against unauthorized access (read access).
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
SRG-APP-000141
Group -
Exchange Send Fatal Errors to Microsoft must be disabled.
It is detrimental for applications to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and...Rule Medium Severity -
SRG-APP-000119
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Exchange audit data must be protected against unauthorized access for modification.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
SRG-APP-000120
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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-000125
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Exchange audit data must be on separate partitions.
Log files help establish a history of activities and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. Audit log content must always be considere...Rule Medium Severity -
SRG-APP-000131
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The Exchange local machine policy must require signed scripts.
Scripts, especially those downloaded from untrusted locations, often provide a way for attackers to infiltrate a system. By setting machine policy to prevent unauthorized script executions, unantic...Rule Medium Severity -
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-000219
Group -
Exchange Internet-facing Receive connectors must offer Transport Layer Security (TLS) before using basic authentication.
Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. TLS is designed to protect confidentiality and data integrity by encrypting email message...Rule Medium Severity -
SRG-APP-000247
Group -
SRG-APP-000261
Group
Node 2
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