windows-itpro-docs/windows/security/threat-protection/security-policy-settings/system-settings-optional-subsystems.md

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System settings Optional subsystems (Windows 10)	Describes the best practices, location, values, policy management and security considerations for the System settings Optional subsystems security policy setting.	5cb6519a-4f84-4b45-8072-e2aa8a72fb78		dansimp	w10	deploy	library	security	medium	dansimp	dansimp	ITPro	M365-security-compliance	conceptual	04/19/2017

System settings: Optional subsystems

Applies to

• Windows 10

Describes the best practices, location, values, policy management and security considerations for the System settings: Optional subsystems security policy setting.

Reference

This policy setting determines which subsystems support your applications. You can use this security setting to specify as many subsystems as your environment demands.

The subsystem introduces a security risk that is related to processes that can potentially persist across logons. If a user starts a process and then logs out, the next user who logs on to the system might access the process that the previous user started. This is dangerous, because the process started by the first user can retain that user's system user rights; therefore, anything that the second user does using that process is performed with the user rights of the first user. This makes it difficult to trace who creates processes and objects, which is essential for post-security incident forensics.

Possible values

• User-defined list of subsystems
• Not defined

Best practices

• Set this policy setting to a null value. The default value is POSIX, so applications that rely on the POSIX subsystem will no longer run. For example, Microsoft Services for UNIX 3.0 installs an updated version of the POSIX subsystem. Reset this policy setting in Group Policy for any servers that use Services for UNIX 3.0.

Location

Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options

Default values

The following table lists the actual and effective default values for this policy. Default values are also listed on the policy’s property page.

Server type or GPO	Default value
Default Domain Policy	Not defined
Default Domain Controller Policy	Not defined
Stand-Alone Server Default Settings	POSIX
DC Effective Default Settings	POSIX
Member Server Effective Default Settings	POSIX
Client Computer Effective Default Settings	POSIX

Policy management

This section describes features and tools that are available to help you manage this policy.

Restart requirement

None. Changes to this policy become effective without a device restart when they are saved locally or distributed through Group Policy.

Security considerations

This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation.

Vulnerability

The POSIX subsystem is an Institute of Electrical and Electronic Engineers (IEEE) standard that defines a set of operating system services. The POSIX subsystem is required if the server supports applications that use that subsystem.

The POSIX subsystem introduces a security risk that relates to processes that can potentially persist across logons. If a user starts a process and then logs out, there is a potential that the next user who logs on to the computer could access the previous user's process. This would allow the second user to take actions on the process by using the privileges of the first user.

Countermeasure

Configure the System settings: Optional subsystems setting to a null value. The default value is POSIX.

Potential impact

Applications that rely on the POSIX subsystem no longer operate. For example, Microsoft Services for UNIX (SFU) installs an updated version of the POSIX subsystem that is required, so you must reconfigure this setting in Group Policy for any servers that use SFU.

Related topics

• Security Options