Optional component installation and component repair must be prevented from using Windows Update.

From Windows 8 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

SV-48296r1_rule Optional component installation and component repair must be prevented from using Windows Update.

Vulnerability discussion

Uncontrolled system updates can introduce issues to a system. Obtaining update components from an outside source may also potentially provide sensitive information outside of the enterprise. Optional component installation or repair must be obtained from an internal source.

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Configure the policy value for Computer Configuration -> Administrative Templates -> System -> "Specify settings for optional component installation and component repair" to "Enabled" and with "Never attempt to download payload from Windows Update" selected.

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