External Signature Services Menu for Office must be suppressed.

From Microsoft Office System 2013 STIG

Part of DTOO204 - External Signature Services menu

SV-52752r2_rule External Signature Services Menu for Office must be suppressed.

Vulnerability discussion

Users can select Add Signature Services (from the Signature Line drop-down menu on the Insert tab of the Ribbon in Excel 2013, PowerPoint 2013, and Word 2013) to see a list of signature service providers on the Microsoft Office website. If an organization has policies that govern the use of external resources such as signature providers or Office Marketplace, allowing users to access the Add Signature Services menu item might enable them to violate those policies.

Check content

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Office 2013 >> Signing "Suppress external signature services menu item" is set to "Enabled". Use the Windows Registry Editor to navigate to the following hive: HKEY_Users For every users profile hive under HKEY_Users, navigate to the following key: \Software\Policies\Microsoft\Office\15.0\common\signatures Criteria: If the value “SuppressExtSigningSvcs” is REG_DWORD = 1 for every user profile hive, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2013 -> Signing "Suppress external signature services menu item" to "Enabled".

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