Level 1 file extensions must be blocked and not removed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17774	DTOO244 - Outlook	SV-33583r1_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 2010 STIG	2018-04-04

Details

Check Text ( C-34044r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Security Form Settings -> Attachment Security “Remove file extensions blocked as Level 1” 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\security\FileExtensionsRemoveLevel1 Criteria: If registry key exist, this is a finding.

Check Text ( C-34044r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Security Form Settings -> Attachment Security “Remove file extensions blocked as Level 1” 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\security\FileExtensionsRemoveLevel1

Criteria: If registry key exist, this is a finding.

Fix Text (F-29727r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Security -> Security Form Settings -> Attachment Security “Remove file extensions blocked as Level 1” to “Disabled”.