UCF STIG Viewer Logo
Changes are coming to https://stigviewer.com. Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey

Outlook must be configured to force authentication when connecting to an Exchange server.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17734 DTOO280 SV-54053r1_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. When authentication is enabled, 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, ensuring a more secure authentication to the Exchange server.
STIG Date
Microsoft Outlook 2013 STIG 2014-01-06

Details

Check Text ( C-47993r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Account Settings -> Exchange "Authentication with Exchange Server" is set to "Enabled (Kerberos/NTLM Password Authentication)".

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

HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security

Criteria: If the value AuthenticationService is REG_DWORD = 9, this is not a finding.
Fix Text (F-46933r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Account Settings -> Exchange "Authentication with Exchange Server" to "Enabled (Kerberos/NTLM Password Authentication)".