Title

The ability to sign into Office365 must be disabled. (Cat II impact)

Discussion

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.

Check Content

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 HKCU\Software\Policies\Microsoft\Office\15.0\common\signin If the value 'signinoptions' is REG_DWORD = 2, this is not a finding.

Fix Text

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

Additional Identifiers

Rule ID: SV-228535r508020_rule

Vulnerability ID: V-228535

Group Title: SRG-APP-000141

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.