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Exchange must not send automated replies to remote domains.


Overview

Finding ID Version Rule ID IA Controls Severity
V-70043 EX13-MB-000260 SV-84665r2_rule 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
MS Exchange 2013 Mailbox Server Security Technical Implementation Guide 2019-12-23

Details

Check Text ( C-70517r2_chk )
Note: Automated replies to .MIL or .GOV sites are allowed.
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select Name, Identity, AutoReplyEnabled
If the value of “AutoReplyEnabled” is set to “True” and is configured to only Reply to .MIL or .GOV sites, this is not a finding.

If the value of AutoReplyEnabled is not set to False, this is a finding.
Fix Text (F-76279r1_fix)
Open the Exchange Management Shell and enter the following command:

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

Note: The value must be in quotes.