Outlook Anywhere (OA) clients must use NTLM authentication to access email.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-33607	Exch-1-402	SV-44027r2_rule	ECSC-1	Medium

Description
Identification and Authentication provide the foundation for access control. Access to email services applications require NTLM authentication. Outlook Anywhere, if authorized for use by the site, must use NTLM authentication when accessing email. Note: There is a technical restriction in Exchange OA that requires a direct SSL connection from Outlook to the CA server. There is also a constraint where Microsoft supports that the CA server must participate in the AD domain inside the enclave. For this reason, Outlook Anywhere must be deployed only for enclave-sourced Outlook users.

Description

Identification and Authentication provide the foundation for access control. Access to email services applications require NTLM authentication. Outlook Anywhere, if authorized for use by the site, must use NTLM authentication when accessing email. Note: There is a technical restriction in Exchange OA that requires a direct SSL connection from Outlook to the CA server. There is also a constraint where Microsoft supports that the CA server must participate in the AD domain inside the enclave. For this reason, Outlook Anywhere must be deployed only for enclave-sourced Outlook users.

STIG	Date
Exchange 2010 Client Access Server STIG	2014-03-11

Details

Check Text ( C-41714r3_chk )
Open the Exchange Management Shell and enter the following command: Get-OutlookAnywhere If the value of 'Client Authentication Method' is not set to 'NTLM', this is a finding.

Fix Text (F-37499r2_fix)
Open the Exchange Management Shell and enter the following command: Set-OutlookAnywhere -ClientAuthenticationMethod NTLM