Details

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 reports. This setting can be used to determine if all the servers in the organization can send ‘Out of Office’ messages.

Solution

Open the Exchange Management Shell and enter the following command:

Set-RemoteDomain -Identity <'IdentityName'> -AutoReplyEnabled $false

Note: The value must be in single quotes.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Exchange_2016_Y21M07_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: System and Information Integrity.This control applies to the following type of system Windows.

References

• 800-53|SI-8(2)
• CAT|II
• CCI|CCI-001308
• Rule-ID|SV-228396r612748_rule
• STIG-ID|EX16-MB-000520
• STIG-Legacy|SV-95417
• STIG-Legacy|V-80707
• Vuln-ID|V-228396

Source

• Tenable.com/audits