STIGQter: STIG Summary: Microsoft Office 365 ProPlus Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

The Exchange client authentication with Exchange servers must be enabled to use Kerberos Password Authentication.

DISA Rule

SV-223346r508019_rule

Vulnerability Number

V-223346

Group Title

SRG-APP-000575

Rule Version

O365-OU-000001

Severity

CAT II

CCI(s)

• CCI-001967 - The information system authenticates organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.

Weight

10

Fix Recommendation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Account Settings >> Exchange >> Authentication with Exchange Server to Kerberos Password Authentication.

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Account Settings >> Exchange >> Authentication with Exchange Server is set to Kerberos Password Authentication.

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

HKCU\software\policies\microsoft\office\16.0\outlook\security!authenticationservice

If the value authenticationservice is set to REG_DWORD = 16 (decimal) or 10 (hex), this is not a finding.

Vulnerability Number

V-223346

Documentable

False

Rule Version

O365-OU-000001

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Account Settings >> Exchange >> Authentication with Exchange Server is set to Kerberos Password Authentication.

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

HKCU\software\policies\microsoft\office\16.0\outlook\security!authenticationservice

If the value authenticationservice is set to REG_DWORD = 16 (decimal) or 10 (hex), this is not a finding.

Check Content Reference

M

Target Key

4099

Comments