Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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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 Medium Severity -
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 -
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 -
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 nonexistent recipients. Those not rej...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 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 -
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 -
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 -
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 -
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 -
Role-Based Access Control must be defined for privileged and nonprivileged users.
Role Based Access Control (RBAC) is the permissions model used in Microsoft Exchange Server 2013, 2016, and 2019. With RBAC, there is no need to modify and manage access control lists (ACLs), which...Rule Medium Severity -
The 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 soft...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 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 ...Rule High Severity -
Exchange must render hyperlinks from email sources from non-.mil domains as unclickable.
Active hyperlinks within an email are susceptible to attacks of malicious software or malware. The hyperlink could lead to a malware infection or redirect the website to another fraudulent website ...Rule Medium Severity
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