Publishing calendars to Office Online must be prevented.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17763	DTOO216	SV-53869r1_rule		Medium

Description
Outlook users can share their calendars with selected others by publishing them to the Microsoft Office Outlook Calendar Sharing Service. Users can control who can view their calendar and at what level of detail. When an organization has policies that govern access to external resources such as Office Online, allowing users to publish their calendars will enable them to violate those policies.

STIG	Date
Microsoft Outlook 2013 STIG	2018-09-05

Details

Check Text ( C-47910r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Calendar Options -> Office.com Sharing Service "Prevent publishing to Office.com" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\options\pubcal Criteria: If the value DisableOfficeOnline is REG_DWORD = 1, this is not a finding.

Check Text ( C-47910r1_chk )

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Calendar Options -> Office.com Sharing Service "Prevent publishing to Office.com" is set to "Enabled".

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

HKCU\Software\Policies\Microsoft\Office\15.0\outlook\options\pubcal

Criteria: If the value DisableOfficeOnline is REG_DWORD = 1, this is not a finding.

Fix Text (F-46774r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Calendar Options -> Office.com Sharing Service "Prevent publishing to Office.com" to "Enabled".