Microsoft Outlook 2013 Security Technical Implementation Guide

The Microsoft Outlook 2013 Security Technical Implementation Guide (V1 R14) has 82 STIG checks. New to STIG checklists? Read What is a STIG checklist?, CKL vs CKLB, and STIG vs SCAP benchmark.

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Severity

Version

V1 · R14

CurrentPublished Thu Jan 30 2025

Level 1 file extensions must be blocked and not removed.

Microsoft Outlook 2013 Security Technical Implementation Guide

Assessment Title

Rule Text

Level 1 file extensions must be blocked and not removed.

Description

Discussion Text

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.

New to STIG checklists? Read What is a STIG checklist? and CKL vs CKLB.

Objective

V-242700

Rule

SV-242700r961086_rule

Severity

medium

Rule Version

DTOO244

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

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

Criteria: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security\

Criteria: If the registry value "FileExtensionsRemoveLevel1" exists, this is a finding.

Implementation Procedure

Fix Text

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".

STIG check 37 of 82 in the Microsoft Outlook 2013 STIG checklist

← Previous · V-242699The prompt to display level 1 attachments must be disallowed when closing an item.Next · V-242701 →Level 2 file extensions must be blocked and not removed.