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

Files failing file validation must be opened in Excel in Protected view mode and disallow edits.

DISA Rule

SV-223342r508019_rule

Vulnerability Number

V-223342

Group Title

SRG-APP-000210

Rule Version

O365-EX-000033

Severity

CAT II

CCI(s)

• CCI-001170 - The information system prevents the automatic execution of mobile code in organization-defined software applications.

Weight

10

Fix Recommendation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Set document behavior if file validation fails to "Enabled: Open in Protected View".

Uncheck the "Allow edit" check box.

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Set document behavior if file validation fails is set to "Enabled: Open in Protected View". Verify the check box for "Allow edit" is not selected.

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

HKCU\Software\Policies\Microsoft\Office\16.0\Excel\security\filevalidation

If the value openinprotectedview does not exist, this is not a finding.

If both the value for openinprotectedview is REG_DWORD = 1 and the value for DisableEditFromPV is set to REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-223342

Documentable

False

Rule Version

O365-EX-000033

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> Protected View >> Set document behavior if file validation fails is set to "Enabled: Open in Protected View". Verify the check box for "Allow edit" is not selected.

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

HKCU\Software\Policies\Microsoft\Office\16.0\Excel\security\filevalidation

If the value openinprotectedview does not exist, this is not a finding.

If both the value for openinprotectedview is REG_DWORD = 1 and the value for DisableEditFromPV is set to REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

4099

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