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The 64-bit tab processes, when running in Enhanced Protected Mode on 64-bit versions of Windows, must be turned on.


Overview

Finding ID Version Rule ID IA Controls Severity
V-46995 DTBI356-IE11 SV-59861r1_rule ECSC-1 Medium
Description
This policy setting determines whether Internet Explorer 11 uses 64-bit processes (for greater security) or 32-bit processes (for greater compatibility) when running in Enhanced Protected Mode on 64-bit versions of Windows.Important: Some ActiveX controls and toolbars may not be available when 64-bit processes are used. If you enable this policy setting, Internet Explorer 11 will use 64-bit tab processes when running in Enhanced Protected Mode on 64-bit versions of Windows. If you disable this policy setting, Internet Explorer 11 will use 32-bit tab processes when running in Enhanced Protected Mode on 64-bit versions of Windows. If you don't configure this policy setting, users can turn this feature on or off using Internet Explorer settings. This feature is turned off by default.
STIG Date
Microsoft Internet Explorer 11 Security Technical Implementation Guide 2018-06-08

Details

Check Text ( C-49979r2_chk )
The policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer-> Internet Control Panel -> Advanced Page 'Turn on 64-bit tab processes when running in Enhanced Protected Mode on 64-bit versions of Windows' must be 'Enabled'. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Policies\Microsoft\Internet Explorer\Main Criteria: If the value "Isolation64Bit" is REG_DWORD = 1, this is not a finding.
Fix Text (F-50715r1_fix)
Set the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Internet Explorer-> Internet Control Panel -> Advanced Page 'Turn on 64-bit tab processes when running in Enhanced Protected Mode on 64-bit versions of Windows' to 'Enabled'.