STIGQter: STIG Summary: Microsoft Excel 2016 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 27 Oct 2017:

Trust Bar Notifications for unsigned application add-ins must be blocked.

DISA Rule

SV-85625r1_rule

Vulnerability Number

V-71001

Group Title

SRG-APP-000131

Rule Version

DTOO131

Severity

CAT II

CCI(s)

• CCI-001749 - The information system prevents the installation of organization-defined software components without verification the software component has been digitally signed using a certificate that is recognized and approved by the organization.

Weight

10

Fix Recommendation

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2016 -> Excel Options -> Security -> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" to "Enabled".

Check Contents

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2016 -> Excel Options -> Security -> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" is set to "Enabled".

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

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

Criteria: If the value NoTBPromptUnsignedAddin is REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-71001

Documentable

False

Rule Version

DTOO131

Severity Override Guidance

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2016 -> Excel Options -> Security -> Trust Center "Disable Trust Bar Notification for unsigned application add-ins and block them" is set to "Enabled".

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

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

Criteria: If the value NoTBPromptUnsignedAddin is REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

3113

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