Authentication with Exchange Server must be required.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17734	DTOO280 - Outlook	SV-33486r1_rule	ECSC-1	Medium

Description
Exchange Server supports the Kerberos authentication protocol and NTLM for authentication. The Kerberos protocol is the more secure authentication method and is supported on Windows 2000 Server and later versions. NTLM authentication is supported in pre-Windows 2000 environments. By default, Outlook will attempt to authenticate using the Kerberos authentication protocol, if it cannot (because no Windows 2000 or later domain controllers are available), it will authenticate using NTLM.

Description

Exchange Server supports the Kerberos authentication protocol and NTLM for authentication. The Kerberos protocol is the more secure authentication method and is supported on Windows 2000 Server and later versions. NTLM authentication is supported in pre-Windows 2000 environments. By default, Outlook will attempt to authenticate using the Kerberos authentication protocol, if it cannot (because no Windows 2000 or later domain controllers are available), it will authenticate using NTLM.

STIG	Date
Microsoft Outlook 2010	2015-09-17

Details

Check Text ( C-33970r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Authentication with Exchange Server” must be set to “Enabled (Kerberos/NTLM Password Authentication)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\outlook\security Criteria: If the value AuthenticationService is REG_DWORD = 9, this is not a finding.

Check Text ( C-33970r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Authentication with Exchange Server” must be set to “Enabled (Kerberos/NTLM Password Authentication)”.

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKCU\Software\Policies\Microsoft\Office\14.0\outlook\security

Criteria: If the value AuthenticationService is REG_DWORD = 9, this is not a finding.

Fix Text (F-29658r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Authentication with Exchange Server” to “Enabled (Kerberos/NTLM Password Authentication)”.