Automatic download of Internet Calendar appointment attachments must be disallowed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17738	DTOO284 - Outlook	SV-33496r1_rule		Medium

Description
Files attached to Internet Calendar appointments could contain malicious code that could be used to compromise a computer. By default, Outlook does not download attachments when retrieving Internet Calendar appointments.

STIG	Date
Microsoft Outlook 2010 STIG	2018-04-04

Details

Check Text ( C-33979r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Internet Calendars “Automatically download attachments” must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\outlook\options\webcal Criteria: If the value EnableAttachments is REG_DWORD = 0, this is not a finding.

Check Text ( C-33979r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Internet Calendars “Automatically download attachments” must be set to “Disabled”.

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

HKCU\Software\Policies\Microsoft\Office\14.0\outlook\options\webcal

Criteria: If the value EnableAttachments is REG_DWORD = 0, this is not a finding.

Fix Text (F-29670r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Internet Calendars “Automatically download attachments” to “Disabled”.