Microsoft Outlook 2010 Security Technical Implementation Guide

The Microsoft Outlook 2010 Security Technical Implementation Guide (V1 R14) has 85 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 signed email as plain text must be enforced.

Microsoft Outlook 2010 Security Technical Implementation Guide

Assessment Title

Rule Text

Read signed email as plain text must be enforced.

Description

Discussion Text

Outlook can display e-mail messages and other items in three formats: plain text, Rich Text Format (RTF), and HTML. By default, Outlook displays digitally signed e-mail messages in the format they were received in.

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

Objective

V-242035

Rule

SV-242035r961863_rule

Severity

medium

Rule Version

DTOO215 - Outlook

Documentable

false

IA Controls

NIST SP 800-53

Rev 5

Assessment Procedure

Check Text

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Preferences -> E-mail Options "Read signed e-mail as plain text" must be set to "Enabled".

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

HKCU\Software\Policies\Microsoft\Office\14.0\outlook\options\mail

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

Implementation Procedure

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Outlook Options -> Preferences -> E-mail Options "Read signed e-mail as plain text" to "Enabled".

STIG check 13 of 85 in the Microsoft Outlook 2010 STIG checklist

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