The ability to sign into Office365 must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-40862	DTOO405	SV-53194r2_rule		Medium

Description
Office 2013 can be configured to prompt users for credentials to Office365 using either their Microsoft Account or the user ID assigned by an organization for accessing Office 365. Access to Office 365 will not be permitted and only locally installed and configured Office installations will be used.

STIG	Date
Microsoft Office System 2013 STIG	2017-06-20

Details

Check Text ( C-47500r3_chk )
Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Miscellaneous >> "Block signing into Office" is set to "Enabled: org ID only". Use the Windows Registry Editor to navigate to the following hive: HKEY_Users For every users profile hive under HKEY_Users, navigate to the following key: \software\policies\Microsoft\office\15.0\common\signin If the value “signinoptions” is REG_DWORD = 2 for every user profile hive, this is not a finding.

Check Text ( C-47500r3_chk )

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Miscellaneous >> "Block signing into Office" is set to "Enabled: org ID only".

Use the Windows Registry Editor to navigate to the following hive:
HKEY_Users

For every users profile hive under HKEY_Users, navigate to the following key:
\software\policies\Microsoft\office\15.0\common\signin

If the value “signinoptions” is REG_DWORD = 2 for every user profile hive, this is not a finding.

Fix Text (F-46120r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Miscellaneous -> "Block signing into Office" to "Enabled: org ID only".