The Enhanced Mitigation Experience Toolkit (EMET) Default Protections for Internet Explorer must be enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-63387	WN10-EM-000010	SV-77877r3_rule		Medium

Description
Attackers are constantly looking for vulnerabilities in systems and applications. The Enhanced Mitigation Experience Toolkit can enable several mechanisms, such as Data Execution Prevention (DEP), Address Space Layout Randomization (ASLR), and Structured Exception Handler Overwrite Protection (SEHOP) on the system and applications adding additional levels of protection.

STIG	Date
Windows 10 Security Technical Implementation Guide	2017-02-21

Details

Check Text ( C-64129r4_chk )
This is applicable to unclassified systems, for other systems this is NA. If EMET has not been installed and DEP and SEHOP are configured as required in V-68845 and V-68849, this is NA. If the following registry value does not exist or is not configured as specified, this is a finding: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\EMET\Defaults\ Value Name: \Internet Explorer\iexplore.exe Value Type: REG_SZ Value: +EAF+ eaf_modules:mshtml.dll;flash.ocx;jscript.dll;vbscript.dll;vgx.dll +ASR asr_modules:npjpi.dll;jp2iexp.dll;vgx.dll;msxml4*.dll;wshom.ocx;scrrun.dll;vbscript.dll asr_zones:1;2 Due to a change in the registry structure for EMET 5.5, if the system has a previous version of EMET installed and configured, this setting needs to be set to "Not Configured" prior to the upgrade to EMET 5.5, and the new administrative template files copied to the appropriate area. The setting can then be re-enabled.

Check Text ( C-64129r4_chk )

This is applicable to unclassified systems, for other systems this is NA.

If EMET has not been installed and DEP and SEHOP are configured as required in V-68845 and V-68849, this is NA.

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\EMET\Defaults\

Value Name: *\Internet Explorer\iexplore.exe

Value Type: REG_SZ
Value: +EAF+ eaf_modules:mshtml.dll;flash*.ocx;jscript*.dll;vbscript.dll;vgx.dll +ASR asr_modules:npjpi*.dll;jp2iexp.dll;vgx.dll;msxml4*.dll;wshom.ocx;scrrun.dll;vbscript.dll asr_zones:1;2

Due to a change in the registry structure for EMET 5.5, if the system has a previous version of EMET installed and configured, this setting needs to be set to "Not Configured" prior to the upgrade to EMET 5.5, and the new administrative template files copied to the appropriate area. The setting can then be re-enabled.

Fix Text (F-69309r2_fix)
This is applicable to unclassified systems, for other systems this is NA. Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> EMET >> "Default Protections for Internet Explorer" to "Enabled". Note: The Enhanced Mitigation Experience Toolkit must be installed on the system and the administrative template files added to make this setting available. Due to a change in the registry structure for EMET 5.5, if the system has a previous version of EMET installed and configured, this setting needs to be set to "Not Configured" prior to the upgrade to EMET 5.5, and the new administrative template files copied to the appropriate area. The setting can then be re-enabled.

Fix Text (F-69309r2_fix)

This is applicable to unclassified systems, for other systems this is NA.

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> EMET >> "Default Protections for Internet Explorer" to "Enabled".

Note: The Enhanced Mitigation Experience Toolkit must be installed on the system and the administrative template files added to make this setting available.

Due to a change in the registry structure for EMET 5.5, if the system has a previous version of EMET installed and configured, this setting needs to be set to "Not Configured" prior to the upgrade to EMET 5.5, and the new administrative template files copied to the appropriate area. The setting can then be re-enabled.