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

The default file block behavior must be set to not open blocked files in Excel.

DISA Rule

SV-223325r508019_rule

Vulnerability Number

V-223325

Group Title

SRG-APP-000207

Rule Version

O365-EX-000016

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 policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings >> Set default file block behavior to "Enabled:Blocked files are not opened".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings >> Set default file block behavior is set to "Blocked files are not opened".

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

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

If the value OpenInProtectedView is REG_DWORD = 0, this is not a finding.

Vulnerability Number

V-223325

Documentable

False

Rule Version

O365-EX-000016

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Trust Center >> File Block Settings >> Set default file block behavior is set to "Blocked files are not opened".

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

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

If the value OpenInProtectedView is REG_DWORD = 0, this is not a finding.

Check Content Reference

M

Target Key

4099

Comments