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

Outlook Rich Text options must be set for converting to plain text format.

Microsoft Outlook 2013 Security Technical Implementation Guide

Assessment Title

Rule Text

Outlook Rich Text options must be set for converting to plain text format.

Description

Discussion Text

Outlook automatically converts RTF formatted messages that are sent over the Internet to HTML format, so that the message formatting is maintained and attachments are received.
This setting controls how Outlook sends Rich Text Format (RTF) messages to Internet recipients.

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

Objective

V-242742

Rule

SV-242742r961863_rule

Severity

medium

Rule Version

DTOO344

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 -> Mail Format -> Internet Formatting "Outlook Rich Text options" is "Enabled: Convert to Plain Text format".

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 Message RTF Format 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 -> Mail Format -> Internet Formatting "Outlook Rich Text options" to "Enabled: Convert to Plain Text format".

STIG check 79 of 82 in the Microsoft Outlook 2013 STIG checklist

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