Non-administrators must be prevented from applying vendor-signed updates.

From Windows 8 Security Technical Implementation Guide

Part of Windows Installer – Vendor Signed Updates

Associated with IA controls: ECSC-1

SV-48233r1_rule Non-administrators must be prevented from applying vendor-signed updates.

Vulnerability discussion

Uncontrolled system updates can introduce issues to a system. This setting will prevent users from applying vendor-signed updates (though they may be from a trusted source).

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Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Installer -> "Prohibit non-administrators from applying vendor signed updates" to "Enabled".

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