Exchange 2010 Edge Transport Server STIG

The Microsoft Exchange Server 2010 STIGs cover four of the five roles available with Microsoft Exchange Server 2010. The Email Services Policy STIG must also be reviewed for each site hosting email services. Also, for the Client Access server, the IIS guidance must be reviewed prior to the OWA checks. Comments or proposed revisions to this document should be sent via e-mail to the following address: [email protected]

Details

Version / Release: V1R6

Published: 2014-09-05

Updated At: 2018-09-23 02:41:05

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    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-43976r1_rule Exch-2-334 MEDIUM 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 validate the sending domain as authentic. One or more authen
    SV-43977r1_rule Exch-2-336 MEDIUM 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 availability impacts. Filters that govern inbound Email evalua
    SV-43978r1_rule Exch-2-339 MEDIUM SMTP IP Allow List Connection 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 availability impacts. Filters that govern inbound Email evalua
    SV-43980r1_rule Exch-2-342 MEDIUM SMTP IP Allow List entries must be empty. 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 availability impacts. Filters that govern inbound Email evalua
    SV-43981r3_rule Exch-2-705 LOW 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 message size. Failure to control the configuration strate
    SV-43983r2_rule Exch-2-708 LOW Internet Receive Connector connections count must be set to default. Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous inbound connections allowed to the SMTP server. By default, the number of simultaneo
    SV-43985r1_rule Exch-2-710 LOW Receive Connector timeout must be limited. 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 conjunction with the Maximum Inbound Connections Count sett
    SV-43986r1_rule Exch-2-715 MEDIUM 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 application that produces reports to be emailed) then it w
    SV-43987r1_rule Exch-2-718 MEDIUM Internal Receive Connectors must require encryption. The Simple Mail Transfer Protocol (SMTP) Receive Connector is used by Exchange to send and receive messages from server to server using SMTP protocol. This setting controls the encryption strength used for client connections to the SMTP Receive Connector
    SV-43988r1_rule Exch-2-721 MEDIUM 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. There are several controls that work together to provide security between internal servers. This setting controls the authentication
    SV-43989r1_rule Exch-2-724 MEDIUM Internet facing receive connectors must offer TLS before using basic authentication. Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. Transport Layer Security (TLS) is designed to protect confidentiality and data integrity by encrypting email messages between servers and thereby r
    SV-43992r2_rule Exch-2-727 LOW Receive Connectors must control the number of recipients per message. Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of recipients who will receive a copy of a message at one time. This tunable value is related to th
    SV-43994r1_rule Exch-2-730 LOW Receive Connectors must control the number of recipients chunked on a single message. 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 message size. Failure to control the configuration strate
    SV-43995r1_rule Exch-2-733 LOW Receive Connectors must be clearly named. For receive connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be made about the completeness of the configuration. Collect
    SV-43996r2_rule Exch-2-736 MEDIUM Auto-forwarding email to remote domains must be disabled or restricted. Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure Automatic Forwards to remote domains are disabled, except for
    SV-43998r1_rule Exch-2-739 MEDIUM Tarpitting interval must be set. Tarpitting is the practice of artificially delaying server responses for specific SMTP communication patterns that indicate high volumes of SPAM or other unwelcome messages. The intent of tarpitting is to slow down the communication process for SPAM batch
    SV-43999r2_rule Exch-2-741 LOW Receive Connector Maximum Hop Count must be 60. Email system availability depends in part on best practices strategies for setting tuning configurations. This setting controls the maximum number of hops (email servers traversed) a message may take as it travels to its destination. Part of the original
    SV-44001r1_rule Exch-2-743 MEDIUM Recipient 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 availability impacts. Filters that govern inbound Email evalua
    SV-44004r1_rule Exch-2-751 LOW Send Connectors must be clearly named. For send connectors, unclear naming as to direction and purpose increases risk that messages may not flow as intended, troubleshooting efforts may be impaired, or incorrect assumptions may be made about the completeness of the configuration. Collective
    SV-44006r1_rule Exch-2-754 LOW Send Connectors delivery retries must be controlled. This setting controls the rate at which delivery attempts from the home domain are retried, user notifications are issued, and notes the expiration time when the message will be discarded. If delivery retry attempts are too frequent, servers will gener
    SV-44007r3_rule Exch-2-757 LOW Message size restrictions must be controlled on Send 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 message size. Failure to control the configuration strate
    SV-44009r1_rule Exch-2-760 LOW Send Connector connections count must be limited. This setting controls the maximum number of simultaneous outbound connections allowed for a given SMTP Connector, and can be used to throttle the SMTP service if resource constraints warrant it. If the limit is too low, connections may be dropped. If to
    SV-44010r1_rule Exch-2-763 MEDIUM Internal Send Connectors must use Domain Security (Mutual Authentication TLS). The Simple Mail Transfer Protocol (SMTP) connector is used by Exchange to send and receive messages from server to server. There are several controls that work together to provide security between internal servers. This setting controls the authentication
    SV-44012r1_rule Exch-2-766 MEDIUM 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. There are several controls that work together to provide security between internal servers. This setting controls the encryption met
    SV-44014r1_rule Exch-2-771 MEDIUM Non-Internet facing send Connectors must specify a Smart Host. In the case of identifying a 'Smart Host' for the email environment, the connector level is the preferred location for this configuration because flow control in this routing group will be retained even if future changes occur at the Receive Connector lev
    SV-44016r1_rule Exch-2-801 MEDIUM 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 Hub Transport servers and Edge Transport servers. By defa
    SV-44018r1_rule Exch-2-805 MEDIUM Exchange must not send delivery reports to remote domains. Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure that delivery reports to remote domains are disabled. Before
    SV-44019r1_rule Exch-2-808 MEDIUM Exchange must not send non-delivery reports to remote domains. Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Ensure that non-delivery reports to remote domains are disabled. Bef
    SV-44021r1_rule Exch-2-811 MEDIUM External/Internet bound automated response messages must be disabled. SPAM originators, in an effort to refine mailing lists, sometimes use a technique where they monitor transmissions for automated bounce back messages, such as 'Out of Office' messages. Automated messages include such items as Out of Office responses, non
    SV-44023r1_rule Exch-2-814 MEDIUM Exchange must not send auto replies to remote domains. Attackers can use automated messages to determine whether a user account is active, in the office, traveling, and so on. An attacker might use this information to conduct future attacks. Remote users will not receive automated 'Out Of Office' delivery rep
    SV-44026r1_rule Exch-2-817 MEDIUM Email Diagnostic log level must be set to 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, characteristically produces large volumes of data and requires care
    SV-44028r2_rule Exch-2-820 MEDIUM The Send Fatal Errors to Microsoft must be disabled. Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. This setting enables an automated log entry to be sent to Microsoft giving general details about
    SV-44031r1_rule Exch-2-826 MEDIUM Audit data must be protected against unauthorized 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 considered sensitive, and in need of protection. Audit data ava
    SV-44033r1_rule Exch-2-828 MEDIUM 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 amount of privilege possible, attack vectors that align
    SV-44036r1_rule Exch-2-831 MEDIUM Exchange must not send Customer Experience reports to Microsoft. Log files help establish a history of activities, and can be useful in detecting attack attempts or determining tuning adjustments to improve availability. This setting enables an automated entry to be sent to Microsoft giving general details about how th
    SV-44038r1_rule Exch-2-839 MEDIUM 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 considered sensitive, and in need of protection. Successful
    SV-44039r1_rule Exch-2-842 MEDIUM 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 monitors that enable the administrator to generate alerts
    SV-44040r1_rule Exch-3-003 MEDIUM Email software must be monitored for change on INFOCON frequency schedule. The INFOCON system provides a framework within which the Commander USSTRATCOM regional commanders, service chiefs, base/post/camp/station/vessel commanders, or agency directors can increase the measurable readiness of their networks to match operational p
    SV-44041r1_rule Exch-3-006 MEDIUM Exchange software baseline copy must exist. Exchange software, as with other application software installed on a host system, must be included in a system baseline record and periodically reviewed; otherwise unauthorized changes to the software may not be discovered. This effort is a vital step to
    SV-44042r1_rule Exch-2-005 MEDIUM Accepted domains must be 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 accepting email for unauthorized domains.ECSC-1
    SV-44043r1_rule Exch-3-804 MEDIUM 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 services, the associated open ports become unresponsive t
    SV-44044r1_rule Exch-2-011 LOW Global inbound message size must be controlled. Email system availability depends in part on best practices strategies for setting tuning configurations. Message size limits should be set to 10 megabytes at most, but often are smaller, depending on the organization. The key point in message size is tha
    SV-44045r1_rule Exch-3-807 MEDIUM Email application must not share a partition with another application. In the same way that added security layers can provide a cumulative positive effect on security posture, multiple applications can provide a cumulative negative effect. A vulnerability and subsequent exploit to one application can lead to an exploit of ot
    SV-44046r2_rule Exch-2-014 MEDIUM Servers must use approved DoD certificates. Server certificates are required for many security features in Exchange; without them the server cannot engage in many forms of secure communication. Failure to implement valid certificates makes it virtually impossible to secure Exchange's communication
    SV-44047r2_rule Exch-2-015 LOW Global outbound message size must be controlled. Email system availability depends in part on best practices strategies for setting tuning configurations. Message size limits should be set to 10 megabytes at most, but often are smaller, depending on the organization. The key point in message size is tha
    SV-44049r3_rule Exch-3-814 MEDIUM The current, approved service pack must be installed. Failure to install the most current Exchange service pack leaves a system vulnerable to exploitation. Current service packs correct known security and system vulnerabilities. ECSC-1
    SV-44050r1_rule Exch-2-017 LOW Global recipient count limit must be set. Email system availability depends in part on best practices strategies for setting tuning configurations. The Global Recipient Count limit field is used to control the maximum number of recipients that can be specified in a single message sent from this s
    SV-44051r1_rule Exch-2-333 MEDIUM Messages with malformed from address must be rejected. Sender Identification (SID) is an email anti-spam sanitization process. Sender ID uses DNS MX record lookups to verify the SMTP sending server is authorized to send email for the originating domain. Failure to implement Sender ID risks that SPAM could
    SV-44052r1_rule Exch-2-019 MEDIUM Local machine policy must require signed scripts. Scripts often provide a way for attackers to infiltrate a system, especially those downloaded from untrusted locations. By setting machine policy to prevent unauthorized script executions, unanticipated system impacts can be avoided. Failure to allow o
    SV-44053r2_rule Exch-2-330 MEDIUM 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 eliminated outside the enclave, where there is less risk they
    SV-44054r1_rule Exch-2-200 MEDIUM 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, stating the name, release level, and (often) additional information re
    SV-44055r2_rule Exch-2-201 LOW Outbound Connection Limit per Domain Count must be controlled. Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the maximum number of simultaneous outbound connections from a domain, and works in conjunction with the Maximum Outbound
    SV-44056r1_rule Exch-2-327 MEDIUM SPAM evaluation filter must be enabled. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages may be eliminated from the transport message stream, preventing their entry into the Exchange environment. This significantly reduces the attack vector f
    SV-44057r1_rule Exch-2-302 MEDIUM Attachment filtering must remove undesirable attachments by file type. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. Attachments are being used more frequently for differe
    SV-44058r1_rule Exch-2-324 MEDIUM Sender reputation filter must identify SPAM block level. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. Sender reputation is anti-SPAM functionality that blo
    SV-44059r1_rule Exch-2-321 MEDIUM Sender reputation filter must be enabled. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the Mail server environment. Sender reputation is anti-SPAM functionality that blo
    SV-44060r1_rule Exch-2-305 MEDIUM Non-existent 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 rejected, of course, are deemed to exist, and are therefo
    SV-44061r1_rule Exch-2-317 MEDIUM Sender Filter must block accepted domains at the edge. 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 inbound messages can reduce the risk of SPAM and malware i
    SV-44062r1_rule Exch-2-308 MEDIUM Filtered messages must be archived. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. This significantly reduces the attack vector for inbou
    SV-44063r1_rule Exch-2-314 MEDIUM Messages with blank sender field must be filtered. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. Anonymous email (messages with blank sender fields) c
    SV-44064r1_rule Exch-2-311 MEDIUM Messages with blank senders must be rejected. By performing filtering at the perimeter, up to 90% of SPAM, malware, and other undesirable messages are eliminated from the message stream rather than admitting them into the mail server environment. Anonymous Email (messages with blank sender fields) ca
    SV-44066r1_rule Exch-2-769 LOW Outbound Connection Timeout must be 10 or less. Email system availability depends in part on best practices strategies for setting tuning configurations. This configuration controls the number of idle minutes before the connection is dropped. It works in conjunction with the Maximum Outbound Connection