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Internet facing receive connectors must offer TLS before using basic authentication.


Overview

Finding ID Version Rule ID IA Controls Severity
V-33569 Exch-2-724 SV-43989r1_rule ECSC-1 Medium
Description
Sending unencrypted email over the Internet increases the risk that messages can be intercepted or altered. Transport Layer Security (TLS) is designed to protect confidentiality and data integrity by encrypting email messages between servers and thereby reducing the risk of eavesdropping, interception, and alteration. This setting forces Exchange to offer TLS before using basic authentication.
STIG Date
MS Exchange 2010 Edge Transport Server STIG 2019-03-21

Details

Check Text ( C-41675r1_chk )
Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector -Identity <'ServerUnderReview\ReceiveConnector'> | Select AuthMechanism

If the value of 'AuthMechanism' is not set to 'Tls, BasicAuth, BasicAuthRequireTLS', this is a finding.
Fix Text (F-37460r1_fix)
Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'ReceiveConnector'> -AuthMechanism 'Tls, BasicAuth, BasicAuthRequireTLS'