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Level 1 file extensions must be blocked and not removed.


Overview

Finding ID Version Rule ID IA Controls Severity
V-17774 DTOO244 SV-55898r1_rule Medium
Description
Malicious code is often spread through e-mail. Some viruses have the ability to send copies of themselves to other people in the victim's Address Book or Contacts list, and such potentially harmful files can affect the computers of unwary recipients.
STIG Date
Microsoft Outlook 2013 STIG 2017-03-17

Details

Check Text ( C-47962r3_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Security Form Settings -> Attachment Security "Remove file extensions blocked as Level 1" is set to "Disabled".

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

HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security\FileExtensionsRemoveLevel1

Criteria: If the registry key exists, this is a finding.
Fix Text (F-46876r2_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Security Form Settings -> Attachment Security "Remove file extensions blocked as Level 1" to "Disabled".