Microsoft Windows Server 2019 Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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Windows Server 2019 domain controllers must run on a machine dedicated to that function.
Executing application servers on the same host machine with a directory server may substantially weaken the security of the directory server. Web or database server applications usually require the...Rule Medium Severity -
Windows Server 2019 local users on domain-joined member servers must not be enumerated.
The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel.Rule Medium Severity -
Windows Server 2019 must not have the Microsoft FTP service installed unless required by the organization.
Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption.Rule Medium Severity -
Windows Server 2019 must not have the Telnet Client installed.
Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.Rule Medium Severity -
Windows Server 2019 shared user accounts must not be permitted.
Shared accounts (accounts where two or more people log on with the same user identification) do not provide adequate identification and authentication. There is no way to provide for nonrepudiation...Rule Medium Severity -
Windows Server 2019 accounts must require passwords.
The lack of password protection enables anyone to gain access to the information system, which opens a backdoor opportunity for intruders to compromise the system as well as other resources. Accoun...Rule Medium Severity -
Windows Server 2019 Active Directory user accounts, including administrators, must be configured to require the use of a Common Access Card (CAC), Personal Identity Verification (PIV)-compliant hardware token, or Alternate Logon Token (ALT) for user authentication.
Smart cards such as the CAC support a two-factor authentication technique. This provides a higher level of trust in the asserted identity than use of the username and password for authentication. ...Rule Medium Severity -
Windows Server 2019 Kerberos user logon restrictions must be enforced.
This policy setting determines whether the Kerberos Key Distribution Center (KDC) validates every request for a session ticket against the user rights policy of the target computer. The policy is e...Rule Medium Severity -
Windows Server 2019 Kerberos service ticket maximum lifetime must be limited to 600 minutes or less.
This setting determines the maximum amount of time (in minutes) that a granted session ticket can be used to access a particular service. Session tickets are used only to authenticate new connectio...Rule Medium Severity -
Windows Server 2019 Kerberos user ticket lifetime must be limited to 10 hours or less.
In Kerberos, there are two types of tickets: Ticket Granting Tickets (TGTs) and Service Tickets. Kerberos tickets have a limited lifetime so the time an attacker has to implement an attack is limit...Rule Medium Severity -
Windows Server 2019 Kerberos policy user ticket renewal maximum lifetime must be limited to seven days or less.
This setting determines the period of time (in days) during which a user's TGT may be renewed. This security configuration limits the amount of time an attacker has to crack the TGT and gain access...Rule Medium Severity -
Windows Server 2019 computer clock synchronization tolerance must be limited to five minutes or less.
This setting determines the maximum time difference (in minutes) that Kerberos will tolerate between the time on a client's clock and the time on a server's clock while still considering the two cl...Rule Medium Severity -
Windows Server 2019 outdated or unused accounts must be removed or disabled.
Outdated or unused accounts provide penetration points that may go undetected. Inactive accounts must be deleted if no longer necessary or, if still required, disabled until needed.Rule Medium Severity -
Windows Server 2019 Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.
Certain encryption types are no longer considered secure. The DES and RC4 encryption suites must not be used for Kerberos encryption. Note: Organizations with domain controllers running earlier ve...Rule Medium Severity -
Windows Server 2019 must have the built-in guest account disabled.
A system faces an increased vulnerability threat if the built-in guest account is not disabled. This is a known account that exists on all Windows systems and cannot be deleted. This account is ini...Rule Medium Severity -
Windows Server 2019 must automatically remove or disable emergency accounts after the crisis is resolved or within 72 hours.
Emergency administrator accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activatio...Rule Medium Severity -
Windows Server 2019 Windows Remote Management (WinRM) client must not use Basic authentication.
Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.Rule High Severity -
Windows Server 2019 Windows Remote Management (WinRM) client must not use Digest authentication.
Digest authentication is not as strong as other options and may be subject to man-in-the-middle attacks. Disallowing Digest authentication will reduce this potential.Rule Medium Severity -
Windows Server 2019 Windows Remote Management (WinRM) service must not use Basic authentication.
Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.Rule High Severity -
Windows Server 2019 administrator accounts must not be enumerated during elevation.
Enumeration of administrator accounts when elevating can provide part of the logon information to an unauthorized user. This setting configures the system to always require users to type in a usern...Rule Medium Severity
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