Disallowance of trusted locations on the network must be enforced.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17520	DTOO134	SV-53724r1_rule	ECSC-1	Medium

Description
Files located in trusted locations and specified in the Trust Center are typically assumed to be safe. Content, code, and add-ins are allowed to load from trusted locations with minimal security and without prompting the user for permission. By default, users can specify "Trusted Locations" on network shares, or in other remote locations not under their direct control, by selecting the "Allow Trusted Locations on my network" (not recommended) check box in the "Trusted Locations" section of the Trust Center. If a dangerous file is opened from a trusted location, it will not be subject to typical security measures and could affect users' computers or data.

Description

Files located in trusted locations and specified in the Trust Center are typically assumed to be safe. Content, code, and add-ins are allowed to load from trusted locations with minimal security and without prompting the user for permission. By default, users can specify "Trusted Locations" on network shares, or in other remote locations not under their direct control, by selecting the "Allow Trusted Locations on my network" (not recommended) check box in the "Trusted Locations" section of the Trust Center. If a dangerous file is opened from a trusted location, it will not be subject to typical security measures and could affect users' computers or data.

STIG	Date
Microsoft Excel 2013 STIG	2014-04-03

Details

Check Text ( C-47810r1_chk )
Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Allow Trusted Locations on the network" is set to Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\trusted locations Criteria: If the value AllowNetworkLocations is REG_DWORD = 0, this is not a finding.

Check Text ( C-47810r1_chk )

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Allow Trusted Locations on the network" is set to Disabled".

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

HKCU\Software\Policies\Microsoft\Office\15.0\excel\security\trusted locations

Criteria: If the value AllowNetworkLocations is REG_DWORD = 0, this is not a finding.

Fix Text (F-46633r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2013 -> Excel Options -> Security -> Trust Center -> Trusted Locations "Allow Trusted Locations on the network" to "Disabled".