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

Open/save of Excel 3 worksheets must be blocked.

DISA Rule

SV-223319r508019_rule

Vulnerability Number

V-223319

Group Title

SRG-APP-000207

Rule Version

O365-EX-000010

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 Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings "Excel 3 worksheets" to "Enabled: Open/Save blocked, use open policy".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings "Excel 3 worksheets" is set to "Enabled: Open/Save blocked, use open policy".

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

HKCU\Software\Policies\Microsoft\Office\16.0\excel\security\fileblock

If the value XL3Worksheets is REG_DWORD = 2, this is not a finding.

Vulnerability Number

V-223319

Documentable

False

Rule Version

O365-EX-000010

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings "Excel 3 worksheets" is set to "Enabled: Open/Save blocked, use open policy".

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

HKCU\Software\Policies\Microsoft\Office\16.0\excel\security\fileblock

If the value XL3Worksheets is REG_DWORD = 2, this is not a finding.

Check Content Reference

M

Target Key

4099

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