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Exchange must not send auto replies to remote domains.


Overview

Finding ID Version Rule ID IA Controls Severity
V-33603 Exch-2-814 SV-44023r1_rule ECSC-1 Medium
Description
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.
STIG Date
Exchange 2010 Hub Transport Server STIG 2017-01-04

Details

Check Text ( C-41711r2_chk )
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | select identity, AutoReplyEnabled

If the value of 'AutoReplyEnabled' is not set to 'False', this is a finding.
Fix Text (F-37496r1_fix)
Open the Exchange Management Shell and enter the following command:

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