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Exchange must not send non-delivery reports to remote domains.


Overview

Finding ID Version Rule ID IA Controls Severity
V-33599 Exch-2-808 SV-44019r1_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. Ensure that non-delivery 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
Exchange 2010 Hub Transport Server STIG 2013-07-11

Details

Check Text ( C-41706r2_chk )
Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | select identity, NDREnabled

If the value of 'NDREnabled' is not set to 'False', this is a finding.
Fix Text (F-37491r1_fix)
Open the Exchange Management Shell and enter the following command:

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