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Windows 10 Exploit Protection system-level mitigation, Control flow guard (CFG), must be on.


Overview

Finding ID Version Rule ID IA Controls Severity
V-77097 WN10-EP-000040 SV-91793r2_rule Medium
Description
Exploit protection in Windows 10 enables mitigations against potential threats at the system and application level. Several mitigations, including "Control flow guard (CFG)", are enabled by default at the system level. CFG ensures flow integrity for indirect calls. If this is turned off, Windows 10 may be subject to various exploits.
STIG Date
Windows 10 Security Technical Implementation Guide 2018-04-06

Details

Check Text ( C-79583r1_chk )
This is NA prior to v1709 of Windows 10.

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

The default configuration in Exploit Protection is "On by default" which meets this requirement. The PowerShell query results for this show as "NOTSET".

Run "Windows PowerShell" with elevated privileges (run as administrator).

Enter "Get-ProcessMitigation -System".

If the status of "CFG: Enable" is "OFF", this is a finding.

Values that would not be a finding include:
ON
NOTSET (Default configuration)
Fix Text (F-86721r1_fix)
Ensure Exploit Protection system-level mitigation, "Control flow guard (CFG)", is turned on. The default configuration in Exploit Protection is "On by default" which meets this requirement.

Open "Windows Defender Security Center".

Select "App & browser control".

Select "Exploit protection settings".

Under "System settings", configure "Control flow guard (CFG)" to "On by default" or "Use default ()".

The STIG package includes a DEP EP XML file in the "Supporting Files" folder for configuring application mitigations defined in the STIG. This can also be modified to explicitly enforce the system level requirements. Adding the following to the XML file will explicitly turn CFG on (other system level EP requirements can be combined under ):





The XML file is applied with the group policy setting Computer Configuration >> Administrative Settings >> Windows Components >> Windows Defender Exploit Guard >> Exploit Protection >> "Use a common set of exploit protection settings" configured to "Enabled" with file name and location defined under "Options:". It is recommended the file be in a read-only network location.