Internet Explorer Processes for MK protocol must be enforced (Reserved).

From Microsoft Internet Explorer 11 Security Technical Implementation Guide

Part of DTBI599-IE11-MK Protocol - Reserved

Associated with IA controls: ECSC-1

Associated with: CCI-000381

SV-59585r1_rule Internet Explorer Processes for MK protocol must be enforced (Reserved).

Vulnerability discussion

The MK Protocol Security Restriction policy setting reduces attack surface area by blocking the seldom used MK protocol. Some older web applications use the MK protocol to retrieve information from compressed files. Because the MK protocol is not widely used, it should be blocked wherever it is not needed. Setting this policy to "Enabled"; blocks the MK protocol for Windows Explorer and Internet Explorer, which causes resources that use the MK protocol to fail. Disabling this setting allows applications to use the MK protocol API. This guide recommends configuring this setting to "Enabled" to block the MK protocol unless it is specifically needed in the environment. Note: Because resources that use the MK protocol will fail when deploying this setting, ensure none of the applications use the MK protocol.

Check content

The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Security Features -> MK Protocol Security Restriction -> 'Internet Explorer Processes' must be 'Enabled'. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_DISABLE_MK_PROTOCOL Criteria: If the value "(Reserved)" is REG_SZ = 1, this is not a finding.

Fix text

Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer -> Security Features -> MK Protocol Security Restriction -> 'Internet Explorer Processes' to 'Enabled'.

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