STIGQter: STIG Summary: Microsoft Office 365 ProPlus Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

Level 1 file attachments must be blocked from being delivered.

DISA Rule

SV-223362r508019_rule

Vulnerability Number

V-223362

Group Title

SRG-APP-000207

Rule Version

O365-OU-000017

Severity

CAT II

CCI(s)

• CCI-001662 - The information system takes organization-defined corrective action when organization-defined unacceptable mobile code is identified.

Weight

10

Fix Recommendation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Security Form Settings >> Attachment Security >> Remove file extensions blocked as Level 1 to "Disabled".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Security Form Settings >> Attachment Security >> Remove file extensions blocked as Level 1 is set to "Disabled".

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

HKCU\software\policies\microsoft\office\16.0\outlook\security\FileExtensionsRemoveLevel1

If the registry key exists, this is a finding.

Vulnerability Number

V-223362

Documentable

False

Rule Version

O365-OU-000017

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Security Form Settings >> Attachment Security >> Remove file extensions blocked as Level 1 is set to "Disabled".

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

HKCU\software\policies\microsoft\office\16.0\outlook\security\FileExtensionsRemoveLevel1

If the registry key exists, this is a finding.

Check Content Reference

M

Target Key

4099

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