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

Read EMail as plain text must be enforced.

Microsoft Outlook 2013 Security Technical Implementation Guide

Assessment Title

Rule Text

Read EMail as plain text must be enforced.

Description

Discussion Text

Outlook can display email messages and other items in three formats: plain text, Rich Text Format (RTF), and HTML. By default, Outlook displays email messages in whatever format they were received in.

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

Objective

V-242674

Rule

SV-242674r961863_rule

Severity

medium

Rule Version

DTOO214

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 -> Outlook Options -> Preferences -> E-mail Options "Read e-mail as plain text" is set to "Enabled".

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

HKCU\Software\Policies\Microsoft\Office\15.0\outlook\options\mail

Criteria: If the value ReadAsPlain is REG_DWORD = 1, this is not a finding.

Implementation Procedure

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> E-mail Options "Read e-mail as plain text" to "Enabled".

STIG check 11 of 82 in the Microsoft Outlook 2013 STIG checklist

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