STIGQter: STIG Summary: Microsoft Outlook 2016 Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

S/Mime interoperability with external clients for message handling must be configured.

DISA Rule

SV-228452r508021_rule

Vulnerability Number

V-228452

Group Title

SRG-APP-000179

Rule Version

DTOO257

Severity

CAT II

CCI(s)

• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

10

Fix Recommendation

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security -> Cryptography "S/MIME interoperability with external clients" to "Enabled (Handle internally)".

Check Contents

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security -> Cryptography "S/MIME interoperability with external clients" is set to "Enabled (Handle internally)".

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

HKCU\Software\Policies\Microsoft\Office\16.0\outlook\security

Criteria: If the value ExternalSMime is REG_DWORD = 0, this is not a finding.

Vulnerability Number

V-228452

Documentable

False

Rule Version

DTOO257

Severity Override Guidance

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Security -> Cryptography "S/MIME interoperability with external clients" is set to "Enabled (Handle internally)".

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

HKCU\Software\Policies\Microsoft\Office\16.0\outlook\security

Criteria: If the value ExternalSMime is REG_DWORD = 0, this is not a finding.

Check Content Reference

M

Target Key

4224

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