Exchange internet-facing receive connectors must offer Transport Layer Security (TLS) before using basic authentication.

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Exchange internet-facing receive connectors must offer Transport Layer Security (TLS) before using basic authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259595	EX19-ED-000099	SV-259595r942099_rule		Medium

Description
Sending unencrypted email over the internet increases the risk that messages can be intercepted or altered. 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
Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide	2024-01-10

Details

Check Text ( C-63334r942097_chk )
Note: This is not applicable for SIPR enclaves. Open the Exchange Management Shell and enter the following command: Get-ReceiveConnector \| Select-Object -Property Name, Identity, AuthMechanism For each receive connector, if the value of "AuthMechanism" is not set to "Tls, BasicAuth, BasicAuthRequireTLS", this is a finding.

Fix Text (F-63242r942098_fix)
Open the Exchange Management Shell and enter the following command: Set-ReceiveConnector -Identity <'IdentityName'> -AuthMechanism 'Tls, BasicAuth, BasicAuthRequireTLS' Note: The value must be in quotes. Example only for the Identity: \Frontend Repeat the procedure for each receive connector.