Document metadata for password protected files must be protected.

From Microsoft Office System 2016 Security Technical Implementation Guide

Part of SRG-APP-000231

Associated with: CCI-001199

SV-85487r1_rule Document metadata for password protected files must be protected.

Vulnerability discussion

This policy setting determines whether metadata is encrypted when an Office Open XML file is password protected. If you enable this policy setting, Excel 2016, PowerPoint 2016, and Word 2016 encrypt metadata stored in password-protected Office Open XML files and override any configuration changes on users' computers. If you disable this policy setting, Office 2016 applications cannot encrypt metadata in password-protected Office Open XML files, which can reduce security. If you do not configure this policy setting, when an Office Open XML document is protected with a password and saved, any metadata associated with the document is encrypted along with the rest of the document's contents. If this configuration is changed, potentially sensitive information such as the document author and hyperlink references could be exposed to unauthorized people.

Check content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings "Protect document metadata for password protected files" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\16.0\common\security Criteria: If the value OpenXMLEncryptProperty is REG_DWORD = 1, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2016 -> Security Settings "Protect document metadata for password protected files" to "Enabled".

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