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Exchange must not send nondelivery reports to remote domains.


Overview

Finding ID Version Rule ID IA Controls Severity
V-70081 EX13-MB-000320 SV-84703r1_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. Ensure that nondelivery reports to remote domains are disabled. Before enabling this setting, first configure a remote domain using the EMC or the New-RemoteDomain cmdlet.
STIG Date
MS Exchange 2013 Mailbox Server Security Technical Implementation Guide 2016-07-19

Details

Check Text ( C-70555r1_chk )
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select Name, Identity, NDREnabled

If the value of NDREnabled is not set to False, this is a finding.
Fix Text (F-76317r1_fix)
Open the Exchange Management Shell and enter the following command:

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

Note: The value must be in quotes.