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Intranet with Safe Zones for automatic picture downloads must be configured.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17634 DTOO275 - Outlook SV-33562r2_rule Medium
Description
Malicious e-mail senders can send HTML e-mail messages with embedded Web beacons, which are pictures and other content from external servers that can be used to track whether recipients open the messages. Viewing e-mail messages with Web beacons in them provides confirmation that the recipient's e-mail address is valid, which leaves the recipient vulnerable to additional spam and harmful e-mail. By default, Outlook does not download external content in HTML e-mail messages from untrusted senders over the local intranet. If this configuration is changed, Outlook will display external content in all HTML e-mail messages received via the local intranet, which could include Web beacons.
STIG Date
Microsoft Outlook 2010 STIG 2018-04-04

Details

Check Text ( C-34021r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Automatic Picture Download Settings “Include Intranet in Safe Zones for Automatic Picture Download” 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\mail

Criteria: If the value Intranet is REG_DWORD = 0, this is not a finding.
Fix Text (F-29708r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Automatic Picture Download Settings “Include Intranet in Safe Zones for Automatic Picture Download” to “Disabled”.