Windows Server 2019 V001R002 (SCAP)

b

Windows Server 2019 machine inactivity limit must be set to 15 minutes or less, locking the system with the screen saver.

RMF Control: AC-11
Severity: M
CCI: CCI-000056
Version: WN19-SO-000120
Vuln IDs: V-92961
Rule IDs: SV-103049r1_rule

Unattended systems are susceptible to unauthorized use and should be locked when unattended. The screen saver should be set at a maximum of 15 minutes and be password protected. This protects critical and sensitive data from exposure to unauthorized personnel with physical access to the computer. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000029-GPOS-00010, SRG-OS-000031-GPOS-00012

Fix: F-99207r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive logon: Machine inactivity limit" to "900" seconds or less, excluding "0" which is effectively disabled.

b

Windows Server 2019 Deny log on through Remote Desktop Services user right on domain controllers must be configured to prevent unauthenticated access.

RMF Control: AC-17
Severity: M
CCI: CCI-002314
Version: WN19-DC-000410
Vuln IDs: V-92963
Rule IDs: SV-103051r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on through Remote Desktop Services" user right defines the accounts that are prevented from logging on using Remote Desktop Services. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99209r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on through Remote Desktop Services" to include the following: - Guests Group

b

Windows Server 2019 Deny log on through Remote Desktop Services user right on domain-joined member servers must be configured to prevent access from highly privileged domain accounts and all local accounts and from unauthenticated access on all systems.

RMF Control: AC-17
Severity: M
CCI: CCI-002314
Version: WN19-MS-000120
Vuln IDs: V-92965
Rule IDs: SV-103053r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on through Remote Desktop Services" user right defines the accounts that are prevented from logging on using Remote Desktop Services. In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower-trust systems helps mitigate the risk of privilege escalation from credential theft attacks, which could lead to the compromise of an entire domain. Local accounts on domain-joined systems must also be assigned this right to decrease the risk of lateral movement resulting from credential theft attacks. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99211r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on through Remote Desktop Services" to include the following: Domain Systems Only: - Enterprise Admins group - Domain Admins group - Local account (see Note below) All Systems: - Guests group Note: "Local account" is referring to the Windows built-in security group.

b

Windows Server 2019 must be configured to audit logon successes.

RMF Control: AC-17
Severity: M
CCI: CCI-000067
Version: WN19-AU-000190
Vuln IDs: V-92967
Rule IDs: SV-103055r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Logon records user logons. If this is an interactive logon, it is recorded on the local system. If it is to a network share, it is recorded on the system accessed. Satisfies: SRG-OS-000032-GPOS-00013, SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220

Fix: F-99213r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Logon" with "Success" selected.

b

Windows Server 2019 must be configured to audit logon failures.

RMF Control: AC-17
Severity: M
CCI: CCI-000067
Version: WN19-AU-000200
Vuln IDs: V-92969
Rule IDs: SV-103057r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Logon records user logons. If this is an interactive logon, it is recorded on the local system. If it is to a network share, it is recorded on the system accessed. Satisfies: SRG-OS-000032-GPOS-00013, SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220

Fix: F-99215r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Logon" with "Failure" selected.

b

Windows Server 2019 Remote Desktop Services must require secure Remote Procedure Call (RPC) communications.

RMF Control: AC-17
Severity: M
CCI: CCI-000068
Version: WN19-CC-000370
Vuln IDs: V-92971
Rule IDs: SV-103059r1_rule

Allowing unsecure RPC communication exposes the system to man-in-the-middle attacks and data disclosure attacks. A man-in-the-middle attack occurs when an intruder captures packets between a client and server and modifies them before allowing the packets to be exchanged. Usually the attacker will modify the information in the packets in an attempt to cause either the client or server to reveal sensitive information. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093

Fix: F-99217r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security >> "Require secure RPC communication" to "Enabled".

b

Windows Server 2019 Remote Desktop Services must be configured with the client connection encryption set to High Level.

RMF Control: AC-17
Severity: M
CCI: CCI-000068
Version: WN19-CC-000380
Vuln IDs: V-92973
Rule IDs: SV-103061r1_rule

Remote connections must be encrypted to prevent interception of data or sensitive information. Selecting "High Level" will ensure encryption of Remote Desktop Services sessions in both directions. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000250-GPOS-00093

Fix: F-99219r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security >> "Set client connection encryption level" to "Enabled" with "High Level" selected.

b

Windows Server 2019 must be configured to audit Account Management - Security Group Management successes.

RMF Control: AC-2
Severity: M
CCI: CCI-000018
Version: WN19-AU-000100
Vuln IDs: V-92979
Rule IDs: SV-103067r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Security Group Management records events such as creating, deleting, or changing security groups, including changes in group members. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Fix: F-99225r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Management >> "Audit Security Group Management" with "Success" selected.

b

Windows Server 2019 must be configured to audit Account Management - User Account Management successes.

RMF Control: AC-2
Severity: M
CCI: CCI-000018
Version: WN19-AU-000110
Vuln IDs: V-92981
Rule IDs: SV-103069r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. User Account Management records events such as creating, changing, deleting, renaming, disabling, or enabling user accounts. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Fix: F-99227r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Management >> "Audit User Account Management" with "Success" selected.

b

Windows Server 2019 must be configured to audit Account Management - User Account Management failures.

RMF Control: AC-2
Severity: M
CCI: CCI-000018
Version: WN19-AU-000120
Vuln IDs: V-92983
Rule IDs: SV-103071r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. User Account Management records events such as creating, changing, deleting, renaming, disabling, or enabling user accounts. Satisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221

Fix: F-99229r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Management >> "Audit User Account Management" with "Failure" selected.

b

Windows Server 2019 must be configured to audit Logon/Logoff - Account Lockout successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000150
Vuln IDs: V-92987
Rule IDs: SV-103075r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Account Lockout events can be used to identify potentially malicious logon attempts. Satisfies: SRG-OS-000240-GPOS-00090, SRG-OS-000470-GPOS-00214

Fix: F-99233r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Account Lockout" with "Success" selected.

b

Windows Server 2019 must be configured to audit Logon/Logoff - Account Lockout failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000160
Vuln IDs: V-92989
Rule IDs: SV-103077r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Account Lockout events can be used to identify potentially malicious logon attempts. Satisfies: SRG-OS-000240-GPOS-00090, SRG-OS-000470-GPOS-00214

Fix: F-99235r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Account Lockout" with "Failure" selected.

c

Windows Server 2019 local volumes must use a format that supports NTFS attributes.

RMF Control: AC-3
Severity: H
CCI: CCI-000213
Version: WN19-00-000130
Vuln IDs: V-92991
Rule IDs: SV-103079r1_rule

The ability to set access permissions and auditing is critical to maintaining the security and proper access controls of a system. To support this, volumes must be formatted using a file system that supports NTFS attributes.

Fix: F-99237r1_fix

Format volumes to use NTFS or ReFS.

b

Windows Server 2019 Access this computer from the network user right must only be assigned to the Administrators, Authenticated Users, and Enterprise Domain Controllers groups on domain controllers.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000340
Vuln IDs: V-92995
Rule IDs: SV-103083r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Access this computer from the network" right may access resources on the system, and this right must be limited to those requiring it.

Fix: F-99241r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Access this computer from the network" to include only the following accounts or groups: - Administrators - Authenticated Users - Enterprise Domain Controllers

b

Windows Server 2019 Allow log on through Remote Desktop Services user right must only be assigned to the Administrators group on domain controllers.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000360
Vuln IDs: V-92997
Rule IDs: SV-103085r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Allow log on through Remote Desktop Services" user right can access a system through Remote Desktop.

Fix: F-99243r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Allow log on through Remote Desktop Services" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Deny access to this computer from the network user right on domain controllers must be configured to prevent unauthenticated access.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000370
Vuln IDs: V-92999
Rule IDs: SV-103087r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny access to this computer from the network" user right defines the accounts that are prevented from logging on from the network. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99245r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny access to this computer from the network" to include the following: - Guests Group

b

Windows Server 2019 Deny log on as a batch job user right on domain controllers must be configured to prevent unauthenticated access.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000380
Vuln IDs: V-93001
Rule IDs: SV-103089r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on as a batch job" user right defines accounts that are prevented from logging on to the system as a batch job, such as Task Scheduler. The Guests group must be assigned to prevent unauthenticated access.

Fix: F-99247r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on as a batch job" to include the following: - Guests Group

b

Windows Server 2019 Deny log on as a service user right must be configured to include no accounts or groups (blank) on domain controllers.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000390
Vuln IDs: V-93003
Rule IDs: SV-103091r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on as a service" user right defines accounts that are denied logon as a service. Incorrect configurations could prevent services from starting and result in a denial of service.

Fix: F-99249r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on as a service" to include no entries (blank).

b

Windows Server 2019 Deny log on locally user right on domain controllers must be configured to prevent unauthenticated access.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-DC-000400
Vuln IDs: V-93005
Rule IDs: SV-103093r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on locally" user right defines accounts that are prevented from logging on interactively. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99251r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on locally" to include the following: - Guests Group

b

Windows Server 2019 Access this computer from the network user right must only be assigned to the Administrators and Authenticated Users groups on domain-joined member servers and standalone systems.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-MS-000070
Vuln IDs: V-93007
Rule IDs: SV-103095r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Access this computer from the network" user right may access resources on the system, and this right must be limited to those requiring it.

Fix: F-99253r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Access this computer from the network" to include only the following accounts or groups: - Administrators - Authenticated Users

b

Windows Server 2019 Deny access to this computer from the network user right on domain-joined member servers must be configured to prevent access from highly privileged domain accounts and local accounts and from unauthenticated access on all systems.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-MS-000080
Vuln IDs: V-93009
Rule IDs: SV-103097r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny access to this computer from the network" user right defines the accounts that are prevented from logging on from the network. In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower-trust systems helps mitigate the risk of privilege escalation from credential theft attacks, which could lead to the compromise of an entire domain. Local accounts on domain-joined systems must also be assigned this right to decrease the risk of lateral movement resulting from credential theft attacks. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99255r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny access to this computer from the network" to include the following: Domain Systems Only: - Enterprise Admins group - Domain Admins group - "Local account and member of Administrators group" or "Local account" (see Note below) All Systems: - Guests group Note: These are built-in security groups. "Local account" is more restrictive but may cause issues on servers such as systems that provide failover clustering.

b

Windows Server 2019 Deny log on as a batch job user right on domain-joined member servers must be configured to prevent access from highly privileged domain accounts and from unauthenticated access on all systems.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-MS-000090
Vuln IDs: V-93011
Rule IDs: SV-103099r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on as a batch job" user right defines accounts that are prevented from logging on to the system as a batch job, such as Task Scheduler. In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower-trust systems helps mitigate the risk of privilege escalation from credential theft attacks, which could lead to the compromise of an entire domain. The Guests group must be assigned to prevent unauthenticated access.

Fix: F-99257r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on as a batch job" to include the following: Domain Systems Only: - Enterprise Admins Group - Domain Admins Group All Systems: - Guests Group

b

Windows Server 2019 Deny log on as a service user right on domain-joined member servers must be configured to prevent access from highly privileged domain accounts. No other groups or accounts must be assigned this right.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-MS-000100
Vuln IDs: V-93013
Rule IDs: SV-103101r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on as a service" user right defines accounts that are denied logon as a service. In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower-trust systems helps mitigate the risk of privilege escalation from credential theft attacks, which could lead to the compromise of an entire domain. Incorrect configurations could prevent services from starting and result in a denial of service.

Fix: F-99259r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on as a service" to include the following: Domain systems: - Enterprise Admins Group - Domain Admins Group

b

Windows Server 2019 Deny log on locally user right on domain-joined member servers must be configured to prevent access from highly privileged domain accounts and from unauthenticated access on all systems.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-MS-000110
Vuln IDs: V-93015
Rule IDs: SV-103103r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Deny log on locally" user right defines accounts that are prevented from logging on interactively. In an Active Directory Domain, denying logons to the Enterprise Admins and Domain Admins groups on lower-trust systems helps mitigate the risk of privilege escalation from credential theft attacks, which could lead to the compromise of an entire domain. The Guests group must be assigned this right to prevent unauthenticated access.

Fix: F-99261r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Deny log on locally" to include the following: Domain Systems Only: - Enterprise Admins Group - Domain Admins Group All Systems: - Guests Group

b

Windows Server 2019 Allow log on locally user right must only be assigned to the Administrators group.

RMF Control: AC-3
Severity: M
CCI: CCI-000213
Version: WN19-UR-000030
Vuln IDs: V-93017
Rule IDs: SV-103105r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Allow log on locally" user right can log on interactively to a system.

Fix: F-99263r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Allow log on locally" to include only the following accounts or groups: - Administrators

c

Windows Server 2019 permissions on the Active Directory data files must only allow System and Administrators access.

RMF Control: AC-6
Severity: H
CCI: CCI-002235
Version: WN19-DC-000070
Vuln IDs: V-93029
Rule IDs: SV-103117r1_rule

Improper access permissions for directory data-related files could allow unauthorized users to read, modify, or delete directory data or audit trails.

Fix: F-99275r1_fix

Maintain the permissions on NTDS database and log files as follows: NT AUTHORITY\SYSTEM:(I)(F) BUILTIN\Administrators:(I)(F) (I) - permission inherited from parent container (F) - full access

b

Windows Server 2019 Add workstations to domain user right must only be assigned to the Administrators group on domain controllers.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-DC-000350
Vuln IDs: V-93039
Rule IDs: SV-103127r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Add workstations to domain" right may add computers to a domain. This could result in unapproved or incorrectly configured systems being added to a domain.

Fix: F-99285r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Add workstations to domain" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Enable computer and user accounts to be trusted for delegation user right must only be assigned to the Administrators group on domain controllers.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-DC-000420
Vuln IDs: V-93041
Rule IDs: SV-103129r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Enable computer and user accounts to be trusted for delegation" user right allows the "Trusted for Delegation" setting to be changed. This could allow unauthorized users to impersonate other users.

Fix: F-99287r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Enable computer and user accounts to be trusted for delegation" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 must restrict remote calls to the Security Account Manager (SAM) to Administrators on domain-joined member servers and standalone systems.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-MS-000060
Vuln IDs: V-93045
Rule IDs: SV-103133r1_rule

The Windows SAM stores users' passwords. Restricting Remote Procedure Call (RPC) connections to the SAM to Administrators helps protect those credentials.

Fix: F-99291r1_fix

Navigate to the policy Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict clients allowed to make remote calls to SAM". Select "Edit Security" to configure the "Security descriptor:". Add "Administrators" in "Group or user names:" if it is not already listed (this is the default). Select "Administrators" in "Group or user names:". Select "Allow" for "Remote Access" in "Permissions for "Administrators". Click "OK". The "Security descriptor:" must be populated with "O:BAG:BAD:(A;;RC;;;BA) for the policy to be enforced.

b

Windows Server 2019 Enable computer and user accounts to be trusted for delegation user right must not be assigned to any groups or accounts on domain-joined member servers and standalone systems.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-MS-000130
Vuln IDs: V-93047
Rule IDs: SV-103135r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Enable computer and user accounts to be trusted for delegation" user right allows the "Trusted for Delegation" setting to be changed. This could allow unauthorized users to impersonate other users.

Fix: F-99293r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Enable computer and user accounts to be trusted for delegation" to be defined but containing no entries (blank).

b

Windows Server 2019 Access Credential Manager as a trusted caller user right must not be assigned to any groups or accounts.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000010
Vuln IDs: V-93049
Rule IDs: SV-103137r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Access Credential Manager as a trusted caller" user right may be able to retrieve the credentials of other accounts from Credential Manager.

Fix: F-99295r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Access Credential Manager as a trusted caller" to be defined but containing no entries (blank).

c

Windows Server 2019 Act as part of the operating system user right must not be assigned to any groups or accounts.

RMF Control: AC-6
Severity: H
CCI: CCI-002235
Version: WN19-UR-000020
Vuln IDs: V-93051
Rule IDs: SV-103139r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Act as part of the operating system" user right can assume the identity of any user and gain access to resources that the user is authorized to access. Any accounts with this right can take complete control of a system.

Fix: F-99297r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Act as part of the operating system" to be defined but containing no entries (blank).

b

Windows Server 2019 Back up files and directories user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000040
Vuln IDs: V-93053
Rule IDs: SV-103141r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Back up files and directories" user right can circumvent file and directory permissions and could allow access to sensitive data.

Fix: F-99299r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Back up files and directories" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Create a pagefile user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000050
Vuln IDs: V-93055
Rule IDs: SV-103143r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Create a pagefile" user right can change the size of a pagefile, which could affect system performance.

Fix: F-99301r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Create a pagefile" to include only the following accounts or groups: - Administrators

c

Windows Server 2019 Create a token object user right must not be assigned to any groups or accounts.

RMF Control: AC-6
Severity: H
CCI: CCI-002235
Version: WN19-UR-000060
Vuln IDs: V-93057
Rule IDs: SV-103145r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Create a token object" user right allows a process to create an access token. This could be used to provide elevated rights and compromise a system.

Fix: F-99303r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Create a token object" to be defined but containing no entries (blank).

b

Windows Server 2019 Create global objects user right must only be assigned to Administrators, Service, Local Service, and Network Service.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000070
Vuln IDs: V-93059
Rule IDs: SV-103147r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Create global objects" user right can create objects that are available to all sessions, which could affect processes in other users' sessions.

Fix: F-99305r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Create global objects" to include only the following accounts or groups: - Administrators - Service - Local Service - Network Service

b

Windows Server 2019 Create permanent shared objects user right must not be assigned to any groups or accounts.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000080
Vuln IDs: V-93061
Rule IDs: SV-103149r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Create permanent shared objects" user right could expose sensitive data by creating shared objects.

Fix: F-99307r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Create permanent shared objects" to be defined but containing no entries (blank).

b

Windows Server 2019 Create symbolic links user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000090
Vuln IDs: V-93063
Rule IDs: SV-103151r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Create symbolic links" user right can create pointers to other objects, which could expose the system to attack.

Fix: F-99309r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Create symbolic links" to include only the following accounts or groups: - Administrators Systems that have the Hyper-V role will also have "Virtual Machines" given this user right. If this needs to be added manually, enter it as "NT Virtual Machine\Virtual Machines".

c

Windows Server 2019 Debug programs: user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: H
CCI: CCI-002235
Version: WN19-UR-000100
Vuln IDs: V-93065
Rule IDs: SV-103153r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Debug programs" user right can attach a debugger to any process or to the kernel, providing complete access to sensitive and critical operating system components. This right is given to Administrators in the default configuration.

Fix: F-99311r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Debug programs" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Force shutdown from a remote system user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000110
Vuln IDs: V-93067
Rule IDs: SV-103155r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Force shutdown from a remote system" user right can remotely shut down a system, which could result in a denial of service.

Fix: F-99313r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Force shutdown from a remote system" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Generate security audits user right must only be assigned to Local Service and Network Service.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000120
Vuln IDs: V-93069
Rule IDs: SV-103157r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Generate security audits" user right specifies users and processes that can generate Security Log audit records, which must only be the system service accounts defined.

Fix: F-99315r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Generate security audits" to include only the following accounts or groups: - Local Service - Network Service

b

Windows Server 2019 Impersonate a client after authentication user right must only be assigned to Administrators, Service, Local Service, and Network Service.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000130
Vuln IDs: V-93071
Rule IDs: SV-103159r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Impersonate a client after authentication" user right allows a program to impersonate another user or account to run on their behalf. An attacker could use this to elevate privileges.

Fix: F-99317r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Impersonate a client after authentication" to include only the following accounts or groups: - Administrators - Service - Local Service - Network Service

b

Windows Server 2019 Increase scheduling priority: user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000140
Vuln IDs: V-93073
Rule IDs: SV-103161r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Increase scheduling priority" user right can change a scheduling priority, causing performance issues or a denial of service.

Fix: F-99319r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Increase scheduling priority" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Load and unload device drivers user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000150
Vuln IDs: V-93075
Rule IDs: SV-103163r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Load and unload device drivers" user right allows a user to load device drivers dynamically on a system. This could be used by an attacker to install malicious code.

Fix: F-99321r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Load and unload device drivers" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Lock pages in memory user right must not be assigned to any groups or accounts.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000160
Vuln IDs: V-93077
Rule IDs: SV-103165r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Lock pages in memory" user right allows physical memory to be assigned to processes, which could cause performance issues or a denial of service.

Fix: F-99323r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Lock pages in memory" to be defined but containing no entries (blank).

b

Windows Server 2019 Modify firmware environment values user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000180
Vuln IDs: V-93079
Rule IDs: SV-103167r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Modify firmware environment values" user right can change hardware configuration environment variables. This could result in hardware failures or a denial of service.

Fix: F-99325r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Modify firmware environment values" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Perform volume maintenance tasks user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000190
Vuln IDs: V-93081
Rule IDs: SV-103169r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Perform volume maintenance tasks" user right can manage volume and disk configurations. This could be used to delete volumes, resulting in data loss or a denial of service.

Fix: F-99327r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Perform volume maintenance tasks" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Profile single process user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000200
Vuln IDs: V-93083
Rule IDs: SV-103171r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Profile single process" user right can monitor non-system processes performance. An attacker could use this to identify processes to attack.

Fix: F-99329r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Profile single process" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Restore files and directories user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000210
Vuln IDs: V-93085
Rule IDs: SV-103173r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Restore files and directories" user right can circumvent file and directory permissions and could allow access to sensitive data. It could also be used to overwrite more current data.

Fix: F-99331r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Restore files and directories" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 Take ownership of files or other objects user right must only be assigned to the Administrators group.

RMF Control: AC-6
Severity: M
CCI: CCI-002235
Version: WN19-UR-000220
Vuln IDs: V-93087
Rule IDs: SV-103175r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Take ownership of files or other objects" user right can take ownership of objects and make changes.

Fix: F-99333r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Take ownership of files or other objects" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 must be configured to audit Account Management - Other Account Management Events successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000090
Vuln IDs: V-93089
Rule IDs: SV-103177r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Other Account Management Events records events such as the access of a password hash or the Password Policy Checking API being called. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206, SRG-OS-000466-GPOS-00210

Fix: F-99335r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Management >> "Audit Other Account Management Events" with "Success" selected.

b

Windows Server 2019 must be configured to audit Detailed Tracking - Process Creation successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000140
Vuln IDs: V-93091
Rule IDs: SV-103179r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Process Creation records events related to the creation of a process and the source. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000471-GPOS-00215

Fix: F-99337r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Detailed Tracking >> "Audit Process Creation" with "Success" selected.

b

Windows Server 2019 must be configured to audit Policy Change - Audit Policy Change successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000260
Vuln IDs: V-93093
Rule IDs: SV-103181r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Policy Change records events related to changes in audit policy. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99339r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Policy Change >> "Audit Audit Policy Change" with "Success" selected.

b

Windows Server 2019 must be configured to audit Policy Change - Audit Policy Change failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000270
Vuln IDs: V-93095
Rule IDs: SV-103183r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Policy Change records events related to changes in audit policy. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99341r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Policy Change >> "Audit Audit Policy Change" with "Failure" selected.

b

Windows Server 2019 must be configured to audit Policy Change - Authentication Policy Change successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000280
Vuln IDs: V-93097
Rule IDs: SV-103185r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Authentication Policy Change records events related to changes in authentication policy, including Kerberos policy and Trust changes. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206, SRG-OS-000466-GPOS-00210

Fix: F-99343r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Policy Change >> "Audit Authentication Policy Change" with "Success" selected.

b

Windows Server 2019 must be configured to audit Policy Change - Authorization Policy Change successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000290
Vuln IDs: V-93099
Rule IDs: SV-103187r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Authorization Policy Change records events related to changes in user rights, such as "Create a token object". Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206, SRG-OS-000466-GPOS-00210

Fix: F-99345r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Policy Change >> "Audit Authorization Policy Change" with "Success" selected.

b

Windows Server 2019 must be configured to audit Privilege Use - Sensitive Privilege Use successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000300
Vuln IDs: V-93101
Rule IDs: SV-103189r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Sensitive Privilege Use records events related to use of sensitive privileges, such as "Act as part of the operating system" or "Debug programs". Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206, SRG-OS-000466-GPOS-00210

Fix: F-99347r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Privilege Use >> "Audit Sensitive Privilege Use" with "Success" selected.

b

Windows Server 2019 must be configured to audit Privilege Use - Sensitive Privilege Use failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000310
Vuln IDs: V-93103
Rule IDs: SV-103191r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Sensitive Privilege Use records events related to use of sensitive privileges, such as "Act as part of the operating system" or "Debug programs". Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000064-GPOS-00033, SRG-OS-000462-GPOS-00206, SRG-OS-000466-GPOS-00210

Fix: F-99349r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Privilege Use >> "Audit Sensitive Privilege Use" with "Failure" selected.

b

Windows Server 2019 must be configured to audit System - IPsec Driver successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000320
Vuln IDs: V-93105
Rule IDs: SV-103193r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. IPsec Driver records events related to the IPsec Driver, such as dropped packets. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99351r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit IPsec Driver" with "Success" selected.

b

Windows Server 2019 must be configured to audit System - IPsec Driver failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000330
Vuln IDs: V-93107
Rule IDs: SV-103195r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. IPsec Driver records events related to the IPsec Driver, such as dropped packets. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99353r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit IPsec Driver" with "Failure" selected.

b

Windows Server 2019 must be configured to audit System - Other System Events successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000340
Vuln IDs: V-93109
Rule IDs: SV-103197r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Other System Events records information related to cryptographic key operations and the Windows Firewall service. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99355r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit Other System Events" with "Success" selected.

b

Windows Server 2019 must be configured to audit System - Other System Events failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000350
Vuln IDs: V-93111
Rule IDs: SV-103199r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Other System Events records information related to cryptographic key operations and the Windows Firewall service. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99357r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit Other System Events" with "Failure" selected.

b

Windows Server 2019 must be configured to audit System - Security State Change successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000360
Vuln IDs: V-93113
Rule IDs: SV-103201r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Security State Change records events related to changes in the security state, such as startup and shutdown of the system. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99359r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit Security State Change" with "Success" selected.

b

Windows Server 2019 must be configured to audit System - Security System Extension successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000370
Vuln IDs: V-93115
Rule IDs: SV-103203r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Security System Extension records events related to extension code being loaded by the security subsystem. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99361r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit Security System Extension" with "Success" selected.

b

Windows Server 2019 must be configured to audit System - System Integrity successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000380
Vuln IDs: V-93117
Rule IDs: SV-103205r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. System Integrity records events related to violations of integrity to the security subsystem. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000471-GPOS-00215, SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222

Fix: F-99363r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit System Integrity" with "Success" selected.

b

Windows Server 2019 must be configured to audit System - System Integrity failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000390
Vuln IDs: V-93119
Rule IDs: SV-103207r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. System Integrity records events related to violations of integrity to the security subsystem. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000471-GPOS-00215, SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222

Fix: F-99365r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> System >> "Audit System Integrity" with "Failure" selected.

b

Windows Server 2019 must be configured to audit DS Access - Directory Service Access successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-DC-000240
Vuln IDs: V-93133
Rule IDs: SV-103221r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Directory Service Access records events related to users accessing an Active Directory object. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99379r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> DS Access >> "Directory Service Access" with "Success" selected.

b

Windows Server 2019 must be configured to audit DS Access - Directory Service Access failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-DC-000250
Vuln IDs: V-93135
Rule IDs: SV-103223r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Directory Service Access records events related to users accessing an Active Directory object. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99381r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> DS Access >> "Directory Service Access" with "Failure" selected.

b

Windows Server 2019 must be configured to audit DS Access - Directory Service Changes successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-DC-000260
Vuln IDs: V-93137
Rule IDs: SV-103225r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Directory Service Changes records events related to changes made to objects in Active Directory Domain Services. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99383r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> DS Access >> "Directory Service Changes" with "Success" selected.

b

Windows Server 2019 must be configured to audit DS Access - Directory Service Changes failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-DC-000270
Vuln IDs: V-93139
Rule IDs: SV-103227r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Audit Directory Service Changes records events related to changes made to objects in Active Directory Domain Services. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212

Fix: F-99385r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> DS Access >> "Directory Service Changes" with "Failure" selected.

b

Windows Server 2019 must have the number of allowed bad logon attempts configured to three or less.

RMF Control: AC-7
Severity: M
CCI: CCI-000044
Version: WN19-AC-000020
Vuln IDs: V-93141
Rule IDs: SV-103229r1_rule

The account lockout feature, when enabled, prevents brute-force password attacks on the system. The higher this value is, the less effective the account lockout feature will be in protecting the local system. The number of bad logon attempts must be reasonably small to minimize the possibility of a successful password attack while allowing for honest errors made during normal user logon.

Fix: F-99387r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Account Lockout Policy >> "Account lockout threshold" to "3" or fewer invalid logon attempts (excluding "0", which is unacceptable).

b

Windows Server 2019 must have the period of time before the bad logon counter is reset configured to 15 minutes or greater.

RMF Control: AC-7
Severity: M
CCI: CCI-000044
Version: WN19-AC-000030
Vuln IDs: V-93143
Rule IDs: SV-103231r1_rule

The account lockout feature, when enabled, prevents brute-force password attacks on the system. This parameter specifies the period of time that must pass after failed logon attempts before the counter is reset to "0". The smaller this value is, the less effective the account lockout feature will be in protecting the local system. Satisfies: SRG-OS-000021-GPOS-00005, SRG-OS-000329-GPOS-00128

Fix: F-99389r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Account Lockout Policy >> "Reset account lockout counter after" to at least "15" minutes.

b

Windows Server 2019 account lockout duration must be configured to 15 minutes or greater.

RMF Control: AC-7
Severity: M
CCI: CCI-002238
Version: WN19-AC-000010
Vuln IDs: V-93145
Rule IDs: SV-103233r1_rule

The account lockout feature, when enabled, prevents brute-force password attacks on the system. This parameter specifies the period of time that an account will remain locked after the specified number of failed logon attempts.

Fix: F-99391r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Account Lockout Policy >> "Account lockout duration" to "15" minutes or greater. A value of "0" is also acceptable, requiring an administrator to unlock the account.

b

Windows Server 2019 required legal notice must be configured to display before console logon.

RMF Control: AC-8
Severity: M
CCI: CCI-000048
Version: WN19-SO-000130
Vuln IDs: V-93147
Rule IDs: SV-103235r1_rule

Failure to display the logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized access to system resources. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088

Fix: F-99393r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive Logon: Message text for users attempting to log on" to the following: You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions: -The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations. -At any time, the USG may inspect and seize data stored on this IS. -Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose. -This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy. -Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.

a

Windows Server 2019 title for legal banner dialog box must be configured with the appropriate text.

RMF Control: AC-8
Severity: L
CCI: CCI-000048
Version: WN19-SO-000140
Vuln IDs: V-93149
Rule IDs: SV-103237r1_rule

Failure to display the logon banner prior to a logon attempt will negate legal proceedings resulting from unauthorized access to system resources. Satisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000228-GPOS-00088

Fix: F-99395r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive Logon: Message title for users attempting to log on" to "DoD Notice and Consent Banner", "US Department of Defense Warning Statement", or an organization-defined equivalent. If an organization-defined title is used, it can in no case contravene or modify the language of the message text required in WN19-SO-000150.

b

Windows Server 2019 must force audit policy subcategory settings to override audit policy category settings.

RMF Control: AU-12
Severity: M
CCI: CCI-000169
Version: WN19-SO-000050
Vuln IDs: V-93151
Rule IDs: SV-103239r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. This setting allows administrators to enable more precise auditing capabilities.

Fix: F-99397r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Audit: Force audit policy subcategory settings (Windows Vista or later) to override audit policy category settings" to "Enabled".

b

Windows Server 2019 must be configured to audit Account Logon - Credential Validation successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000070
Vuln IDs: V-93153
Rule IDs: SV-103241r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Credential Validation records events related to validation tests on credentials for a user account logon.

Fix: F-99399r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Logon >> "Audit Credential Validation" with "Success" selected.

b

Windows Server 2019 must be configured to audit Account Logon - Credential Validation failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000080
Vuln IDs: V-93155
Rule IDs: SV-103243r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Credential Validation records events related to validation tests on credentials for a user account logon.

Fix: F-99401r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Account Logon >> "Audit Credential Validation" with "Failure" selected.

b

Windows Server 2019 must be configured to audit Logon/Logoff - Special Logon successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000210
Vuln IDs: V-93161
Rule IDs: SV-103249r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Special Logon records special logons that have administrative privileges and can be used to elevate processes. Satisfies: SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220

Fix: F-99407r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Special Logon" with "Success" selected.

b

Windows Server 2019 must be configured to audit Object Access - Other Object Access Events successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000220
Vuln IDs: V-93163
Rule IDs: SV-103251r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Auditing for other object access records events related to the management of task scheduler jobs and COM+ objects.

Fix: F-99409r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Object Access >> "Audit Other Object Access Events" with "Success" selected.

b

Windows Server 2019 must be configured to audit Object Access - Other Object Access Events failures.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000230
Vuln IDs: V-93165
Rule IDs: SV-103253r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Auditing for other object access records events related to the management of task scheduler jobs and COM+ objects.

Fix: F-99411r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Object Access >> "Audit Other Object Access Events" with "Failure" selected.

b

Windows Server 2019 must be configured to audit logoff successes.

RMF Control: AU-12
Severity: M
CCI: CCI-000172
Version: WN19-AU-000180
Vuln IDs: V-93171
Rule IDs: SV-103259r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Logoff records user logoffs. If this is an interactive logoff, it is recorded on the local system. If it is to a network share, it is recorded on the system accessed. Satisfies: SRG-OS-000472-GPOS-00217, SRG-OS-000480-GPOS-00227

Fix: F-99417r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Advanced Audit Policy Configuration >> System Audit Policies >> Logon/Logoff >> "Audit Logoff" with "Success" selected.

b

Windows Server 2019 command line data must be included in process creation events.

RMF Control: AU-3
Severity: M
CCI: CCI-000135
Version: WN19-CC-000090
Vuln IDs: V-93173
Rule IDs: SV-103261r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Enabling "Include command line data for process creation events" will record the command line information with the process creation events in the log. This can provide additional detail when malware has run on a system.

Fix: F-99419r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Audit Process Creation >> "Include command line in process creation events" to "Enabled".

b

Windows Server 2019 PowerShell script block logging must be enabled.

RMF Control: AU-3
Severity: M
CCI: CCI-000135
Version: WN19-CC-000460
Vuln IDs: V-93175
Rule IDs: SV-103263r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. Collecting this data is essential for analyzing the security of information assets and detecting signs of suspicious and unexpected behavior. Enabling PowerShell script block logging will record detailed information from the processing of PowerShell commands and scripts. This can provide additional detail when malware has run on a system.

Fix: F-99421r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows PowerShell >> "Turn on PowerShell Script Block Logging" to "Enabled".

b

Windows Server 2019 Application event log size must be configured to 32768 KB or greater.

RMF Control: AU-4
Severity: M
CCI: CCI-001849
Version: WN19-CC-000270
Vuln IDs: V-93177
Rule IDs: SV-103265r1_rule

Inadequate log size will cause the log to fill up quickly. This may prevent audit events from being recorded properly and require frequent attention by administrative personnel.

Fix: F-99423r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Event Log Service >> Application >> "Specify the maximum log file size (KB)" to "Enabled" with a "Maximum Log Size (KB)" of "32768" or greater.

b

Windows Server 2019 Security event log size must be configured to 196608 KB or greater.

RMF Control: AU-4
Severity: M
CCI: CCI-001849
Version: WN19-CC-000280
Vuln IDs: V-93179
Rule IDs: SV-103267r1_rule

Inadequate log size will cause the log to fill up quickly. This may prevent audit events from being recorded properly and require frequent attention by administrative personnel.

Fix: F-99425r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Event Log Service >> Security >> "Specify the maximum log file size (KB)" to "Enabled" with a "Maximum Log Size (KB)" of "196608" or greater.

b

Windows Server 2019 System event log size must be configured to 32768 KB or greater.

RMF Control: AU-4
Severity: M
CCI: CCI-001849
Version: WN19-CC-000290
Vuln IDs: V-93181
Rule IDs: SV-103269r1_rule

Inadequate log size will cause the log to fill up quickly. This may prevent audit events from being recorded properly and require frequent attention by administrative personnel.

Fix: F-99427r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Event Log Service >> System >> "Specify the maximum log file size (KB)" to "Enabled" with a "Maximum Log Size (KB)" of "32768" or greater.

b

Windows Server 2019 permissions for the Application event log must prevent access by non-privileged accounts.

RMF Control: AU-9
Severity: M
CCI: CCI-000162
Version: WN19-AU-000030
Vuln IDs: V-93189
Rule IDs: SV-103277r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. The Application event log may be susceptible to tampering if proper permissions are not applied. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Fix: F-99435r1_fix

Configure the permissions on the Application event log file (Application.evtx) to prevent access by non-privileged accounts. The default permissions listed below satisfy this requirement: Eventlog - Full Control SYSTEM - Full Control Administrators - Full Control The default location is the "%SystemRoot%\System32\winevt\Logs" folder. If the location of the logs has been changed, when adding Eventlog to the permissions, it must be entered as "NT Service\Eventlog".

b

Windows Server 2019 permissions for the Security event log must prevent access by non-privileged accounts.

RMF Control: AU-9
Severity: M
CCI: CCI-000162
Version: WN19-AU-000040
Vuln IDs: V-93191
Rule IDs: SV-103279r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. The Security event log may disclose sensitive information or be susceptible to tampering if proper permissions are not applied. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Fix: F-99437r1_fix

Configure the permissions on the Security event log file (Security.evtx) to prevent access by non-privileged accounts. The default permissions listed below satisfy this requirement: Eventlog - Full Control SYSTEM - Full Control Administrators - Full Control The default location is the "%SystemRoot%\System32\winevt\Logs" folder. If the location of the logs has been changed, when adding Eventlog to the permissions, it must be entered as "NT Service\Eventlog".

b

Windows Server 2019 permissions for the System event log must prevent access by non-privileged accounts.

RMF Control: AU-9
Severity: M
CCI: CCI-000162
Version: WN19-AU-000050
Vuln IDs: V-93193
Rule IDs: SV-103281r1_rule

Maintaining an audit trail of system activity logs can help identify configuration errors, troubleshoot service disruptions, and analyze compromises that have occurred, as well as detect attacks. Audit logs are necessary to provide a trail of evidence in case the system or network is compromised. The System event log may be susceptible to tampering if proper permissions are not applied. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029

Fix: F-99439r1_fix

Configure the permissions on the System event log file (System.evtx) to prevent access by non-privileged accounts. The default permissions listed below satisfy this requirement: Eventlog - Full Control SYSTEM - Full Control Administrators - Full Control The default location is the "%SystemRoot%\System32\winevt\Logs" folder. If the location of the logs has been changed, when adding Eventlog to the permissions, it must be entered as "NT Service\Eventlog".

b

Windows Server 2019 Event Viewer must be protected from unauthorized modification and deletion.

RMF Control: AU-9
Severity: M
CCI: CCI-001494
Version: WN19-AU-000060
Vuln IDs: V-93195
Rule IDs: SV-103283r1_rule

Protecting audit information also includes identifying and protecting the tools used to view and manipulate log data. Therefore, protecting audit tools is necessary to prevent unauthorized operation on audit information. Operating systems providing tools to interface with audit information will leverage user permissions and roles identifying the user accessing the tools and the corresponding rights the user enjoys in order to make access decisions regarding the modification or deletion of audit tools. Satisfies: SRG-OS-000257-GPOS-00098, SRG-OS-000258-GPOS-00099

Fix: F-99441r1_fix

Configure the permissions on the "Eventvwr.exe" file to prevent modification by any groups or accounts other than TrustedInstaller. The default permissions listed below satisfy this requirement: TrustedInstaller - Full Control Administrators, SYSTEM, Users, ALL APPLICATION PACKAGES, ALL RESTRICTED APPLICATION PACKAGES - Read & Execute The default location is the "%SystemRoot%\System32" folder.

b

Windows Server 2019 Manage auditing and security log user right must only be assigned to the Administrators group.

RMF Control: AU-9
Severity: M
CCI: CCI-000162
Version: WN19-UR-000170
Vuln IDs: V-93197
Rule IDs: SV-103285r1_rule

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. Accounts with the "Manage auditing and security log" user right can manage the security log and change auditing configurations. This could be used to clear evidence of tampering. Satisfies: SRG-OS-000057-GPOS-00027, SRG-OS-000058-GPOS-00028, SRG-OS-000059-GPOS-00029, SRG-OS-000063-GPOS-00032, SRG-OS-000337-GPOS-00129

Fix: F-99443r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Manage auditing and security log" to include only the following accounts or groups: - Administrators

b

Windows Server 2019 must prevent users from changing installation options.

RMF Control: CM-11
Severity: M
CCI: CCI-001812
Version: WN19-CC-000420
Vuln IDs: V-93199
Rule IDs: SV-103287r1_rule

Installation options for applications are typically controlled by administrators. This setting prevents users from changing installation options that may bypass security features.

Fix: F-99445r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Installer >> "Allow user control over installs" to "Disabled".

c

Windows Server 2019 must disable the Windows Installer Always install with elevated privileges option.

RMF Control: CM-11
Severity: H
CCI: CCI-001812
Version: WN19-CC-000430
Vuln IDs: V-93201
Rule IDs: SV-103289r1_rule

Standard user accounts must not be granted elevated privileges. Enabling Windows Installer to elevate privileges when installing applications can allow malicious persons and applications to gain full control of a system.

Fix: F-99447r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Installer >> "Always install with elevated privileges" to "Disabled".

c

Windows Server 2019 must be maintained at a supported servicing level.

RMF Control: CM-6
Severity: H
CCI: CCI-000366
Version: WN19-00-000100
Vuln IDs: V-93215
Rule IDs: SV-103303r1_rule

Systems at unsupported servicing levels will not receive security updates for new vulnerabilities, which leave them subject to exploitation. Systems must be maintained at a servicing level supported by the vendor with new security updates.

Fix: F-99461r1_fix

Update the system to a Version 1809 (Build 17763.xxx) or greater.

b

Windows Server 2019 must have software certificate installation files removed.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-00-000240
Vuln IDs: V-93221
Rule IDs: SV-103309r2_rule

Use of software certificates and their accompanying installation files for end users to access resources is less secure than the use of hardware-based certificates.

Fix: F-101007r1_fix

Remove any certificate installation files (*.p12 and *.pfx) found on a system. Note: This does not apply to server-based applications that have a requirement for .p12 certificate files or Adobe PreFlight certificate files.

a

Windows Server 2019 Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-CC-000030
Vuln IDs: V-93233
Rule IDs: SV-103321r1_rule

Configuring the system to disable IPv6 source routing protects against spoofing.

Fix: F-99479r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (DisableIPSourceRouting IPv6) IP source routing protection level (protects against packet spoofing)" to "Enabled" with "Highest protection, source routing is completely disabled" selected. This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

a

Windows Server 2019 source routing must be configured to the highest protection level to prevent Internet Protocol (IP) source routing.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-CC-000040
Vuln IDs: V-93235
Rule IDs: SV-103323r1_rule

Configuring the system to disable IP source routing protects against spoofing.

Fix: F-99481r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (DisableIPSourceRouting) IP source routing protection level (protects against packet spoofing)" to "Enabled" with "Highest protection, source routing is completely disabled" selected. This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

a

Windows Server 2019 must be configured to prevent Internet Control Message Protocol (ICMP) redirects from overriding Open Shortest Path First (OSPF)-generated routes.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-CC-000050
Vuln IDs: V-93237
Rule IDs: SV-103325r1_rule

Allowing ICMP redirect of routes can lead to traffic not being routed properly. When disabled, this forces ICMP to be routed via the shortest path first.

Fix: F-99483r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (EnableICMPRedirect) Allow ICMP redirects to override OSPF generated routes" to "Disabled". This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 insecure logons to an SMB server must be disabled.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000070
Vuln IDs: V-93239
Rule IDs: SV-103327r1_rule

Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access.

Fix: F-99485r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Lanman Workstation >> "Enable insecure guest logons" to "Disabled".

b

Windows Server 2019 hardened Universal Naming Convention (UNC) paths must be defined to require mutual authentication and integrity for at least the \\*\SYSVOL and \\*\NETLOGON shares.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000080
Vuln IDs: V-93241
Rule IDs: SV-103329r1_rule

Additional security requirements are applied to UNC paths specified in hardened UNC paths before allowing access to them. This aids in preventing tampering with or spoofing of connections to these paths.

Fix: F-99487r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Network Provider >> "Hardened UNC Paths" to "Enabled" with at least the following configured in "Hardened UNC Paths" (click the "Show" button to display): Value Name: \\*\SYSVOL Value: RequireMutualAuthentication=1, RequireIntegrity=1 Value Name: \\*\NETLOGON Value: RequireMutualAuthentication=1, RequireIntegrity=1

b

Windows Server 2019 must be configured to enable Remote host allows delegation of non-exportable credentials.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000100
Vuln IDs: V-93243
Rule IDs: SV-103331r1_rule

An exportable version of credentials is provided to remote hosts when using credential delegation which exposes them to theft on the remote host. Restricted Admin mode or Remote Credential Guard allow delegation of non-exportable credentials providing additional protection of the credentials. Enabling this configures the host to support Restricted Admin mode or Remote Credential Guard.

Fix: F-99489r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Credentials Delegation >> "Remote host allows delegation of non-exportable credentials" to "Enabled".

b

Windows Server 2019 Early Launch Antimalware, Boot-Start Driver Initialization Policy must prevent boot drivers identified as bad.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000130
Vuln IDs: V-93249
Rule IDs: SV-103337r1_rule

Compromised boot drivers can introduce malware prior to protection mechanisms that load after initialization. The Early Launch Antimalware driver can limit allowed drivers based on classifications determined by the malware protection application. At a minimum, drivers determined to be bad must not be allowed.

Fix: F-99495r1_fix

The default behavior is for Early Launch Antimalware - Boot-Start Driver Initialization policy to enforce "Good, unknown and bad but critical" (preventing "bad"). If this needs to be corrected or a more secure setting is desired, configure the policy value for Computer Configuration >> Administrative Templates >> System >> Early Launch Antimalware >> "Boot-Start Driver Initialization Policy" to "Not Configured" or "Enabled" with any option other than "All" selected.

b

Windows Server 2019 group policy objects must be reprocessed even if they have not changed.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000140
Vuln IDs: V-93251
Rule IDs: SV-103339r1_rule

Registry entries for group policy settings can potentially be changed from the required configuration. This could occur as part of troubleshooting or by a malicious process on a compromised system. Enabling this setting and then selecting the "Process even if the Group Policy objects have not changed" option ensures the policies will be reprocessed even if none have been changed. This way, any unauthorized changes are forced to match the domain-based group policy settings again.

Fix: F-99497r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Group Policy >> "Configure registry policy processing" to "Enabled" with the option "Process even if the Group Policy objects have not changed" selected.

b

Windows Server 2019 users must be prompted to authenticate when the system wakes from sleep (on battery).

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000180
Vuln IDs: V-93253
Rule IDs: SV-103341r1_rule

A system that does not require authentication when resuming from sleep may provide access to unauthorized users. Authentication must always be required when accessing a system. This setting ensures users are prompted for a password when the system wakes from sleep (on battery).

Fix: F-99499r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Power Management >> Sleep Settings >> "Require a password when a computer wakes (on battery)" to "Enabled".

b

Windows Server 2019 users must be prompted to authenticate when the system wakes from sleep (plugged in).

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000190
Vuln IDs: V-93255
Rule IDs: SV-103343r1_rule

A system that does not require authentication when resuming from sleep may provide access to unauthorized users. Authentication must always be required when accessing a system. This setting ensures users are prompted for a password when the system wakes from sleep (plugged in).

Fix: F-99501r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Power Management >> Sleep Settings >> "Require a password when a computer wakes (plugged in)" to "Enabled".

b

Windows Server 2019 Telemetry must be configured to Security or Basic.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000250
Vuln IDs: V-93257
Rule IDs: SV-103345r1_rule

Some features may communicate with the vendor, sending system information or downloading data or components for the feature. Limiting this capability will prevent potentially sensitive information from being sent outside the enterprise. The "Security" option for Telemetry configures the lowest amount of data, effectively none outside of the Malicious Software Removal Tool (MSRT), Defender, and telemetry client settings. "Basic" sends basic diagnostic and usage data and may be required to support some Microsoft services.

Fix: F-99503r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Data Collection and Preview Builds>> "Allow Telemetry" to "Enabled" with "0 - Security [Enterprise Only]" or "1 - Basic" selected in "Options".

a

Windows Server 2019 Windows Update must not obtain updates from other PCs on the Internet.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-CC-000260
Vuln IDs: V-93259
Rule IDs: SV-103347r1_rule

Windows Update can obtain updates from additional sources instead of Microsoft. In addition to Microsoft, updates can be obtained from and sent to PCs on the local network as well as on the Internet. This is part of the Windows Update trusted process, however to minimize outside exposure, obtaining updates from or sending to systems on the Internet must be prevented.

Fix: F-99505r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Delivery Optimization >> "Download Mode" to "Enabled" with any option except "Internet" selected. Acceptable selections include: Bypass (100) Group (2) HTTP only (0) LAN (1) Simple (99)

a

Windows Server 2019 Turning off File Explorer heap termination on corruption must be disabled.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-CC-000320
Vuln IDs: V-93261
Rule IDs: SV-103349r1_rule

Legacy plug-in applications may continue to function when a File Explorer session has become corrupt. Disabling this feature will prevent this.

Fix: F-99507r1_fix

The default behavior is for File Explorer heap termination on corruption to be disabled. If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Turn off heap termination on corruption" to "Not Configured" or "Disabled".

b

Windows Server 2019 File Explorer shell protocol must run in protected mode.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000330
Vuln IDs: V-93263
Rule IDs: SV-103351r1_rule

The shell protocol will limit the set of folders that applications can open when run in protected mode. Restricting files an application can open to a limited set of folders increases the security of Windows.

Fix: F-99509r1_fix

The default behavior is for shell protected mode to be turned on for File Explorer. If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Turn off shell protocol protected mode" to "Not Configured" or "Disabled".

b

Windows Server 2019 must prevent attachments from being downloaded from RSS feeds.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000390
Vuln IDs: V-93265
Rule IDs: SV-103353r1_rule

Attachments from RSS feeds may not be secure. This setting will prevent attachments from being downloaded from RSS feeds.

Fix: F-99511r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> RSS Feeds >> "Prevent downloading of enclosures" to "Enabled".

b

Windows Server 2019 users must be notified if a web-based program attempts to install software.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000440
Vuln IDs: V-93267
Rule IDs: SV-103355r1_rule

Web-based programs may attempt to install malicious software on a system. Ensuring users are notified if a web-based program attempts to install software allows them to refuse the installation.

Fix: F-99513r1_fix

The default behavior is for Internet Explorer to warn users and select whether to allow or refuse installation when a web-based program attempts to install software on the system. If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Installer >> "Prevent Internet Explorer security prompt for Windows Installer scripts" to "Not Configured" or "Disabled".

b

Windows Server 2019 must disable automatically signing in the last interactive user after a system-initiated restart.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-CC-000450
Vuln IDs: V-93269
Rule IDs: SV-103357r1_rule

Windows can be configured to automatically sign the user back in after a Windows Update restart. Some protections are in place to help ensure this is done in a secure fashion; however, disabling this will prevent the caching of credentials for this purpose and also ensure the user is aware of the restart.

Fix: F-99515r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Logon Options >> "Sign-in last interactive user automatically after a system-initiated restart" to "Disabled".

b

Windows Server 2019 domain controllers must be configured to allow reset of machine account passwords.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-DC-000330
Vuln IDs: V-93273
Rule IDs: SV-103361r1_rule

Enabling this setting on all domain controllers in a domain prevents domain members from changing their computer account passwords. If these passwords are weak or compromised, the inability to change them may leave these computers vulnerable.

Fix: F-99519r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain controller: Refuse machine account password changes" to "Disabled".

b

Windows Server 2019 must limit the caching of logon credentials to four or less on domain-joined member servers.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-MS-000050
Vuln IDs: V-93275
Rule IDs: SV-103363r1_rule

The default Windows configuration caches the last logon credentials for users who log on interactively to a system. This feature is provided for system availability reasons, such as the user's machine being disconnected from the network or domain controllers being unavailable. Even though the credential cache is well protected, if a system is attacked, an unauthorized individual may isolate the password to a domain user account using a password-cracking program and gain access to the domain.

Fix: F-99521r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive Logon: Number of previous logons to cache (in case Domain Controller is not available)" to "4" logons or less.

c

Windows Server 2019 must prevent local accounts with blank passwords from being used from the network.

RMF Control: CM-6
Severity: H
CCI: CCI-000366
Version: WN19-SO-000020
Vuln IDs: V-93279
Rule IDs: SV-103367r1_rule

An account without a password can allow unauthorized access to a system as only the username would be required. Password policies should prevent accounts with blank passwords from existing on a system. However, if a local account with a blank password does exist, enabling this setting will prevent network access, limiting the account to local console logon only.

Fix: F-99525r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Accounts: Limit local account use of blank passwords to console logon only" to "Enabled".

b

Windows Server 2019 built-in administrator account must be renamed.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000030
Vuln IDs: V-93281
Rule IDs: SV-103369r1_rule

The built-in administrator account is a well-known account subject to attack. Renaming this account to an unidentified name improves the protection of this account and the system.

Fix: F-99527r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Accounts: Rename administrator account" to a name other than "Administrator".

b

Windows Server 2019 built-in guest account must be renamed.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000040
Vuln IDs: V-93283
Rule IDs: SV-103371r1_rule

The built-in guest account is a well-known user account on all Windows systems and, as initially installed, does not require a password. This can allow access to system resources by unauthorized users. Renaming this account to an unidentified name improves the protection of this account and the system.

Fix: F-99529r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Accounts: Rename guest account" to a name other than "Guest".

b

Windows Server 2019 maximum age for machine account passwords must be configured to 30 days or less.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000100
Vuln IDs: V-93285
Rule IDs: SV-103373r1_rule

Computer account passwords are changed automatically on a regular basis. This setting controls the maximum password age that a machine account may have. This must be set to no more than 30 days, ensuring the machine changes its password monthly.

Fix: F-99531r1_fix

This is the default configuration for this setting (30 days). Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Maximum machine account password age" to "30" or less (excluding "0", which is unacceptable).

b

Windows Server 2019 Smart Card removal option must be configured to Force Logoff or Lock Workstation.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000150
Vuln IDs: V-93287
Rule IDs: SV-103375r1_rule

Unattended systems are susceptible to unauthorized use and must be locked. Configuring a system to lock when a smart card is removed will ensure the system is inaccessible when unattended.

Fix: F-99533r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Interactive logon: Smart card removal behavior" to "Lock Workstation" or "Force Logoff".

c

Windows Server 2019 must not allow anonymous enumeration of Security Account Manager (SAM) accounts.

RMF Control: CM-6
Severity: H
CCI: CCI-000366
Version: WN19-SO-000220
Vuln IDs: V-93291
Rule IDs: SV-103379r1_rule

Anonymous enumeration of SAM accounts allows anonymous logon users (null session connections) to list all accounts names, thus providing a list of potential points to attack the system.

Fix: F-99537r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Do not allow anonymous enumeration of SAM accounts" to "Enabled".

b

Windows Server 2019 must be configured to prevent anonymous users from having the same permissions as the Everyone group.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000240
Vuln IDs: V-93293
Rule IDs: SV-103381r1_rule

Access by anonymous users must be restricted. If this setting is enabled, anonymous users have the same rights and permissions as the built-in Everyone group. Anonymous users must not have these permissions or rights.

Fix: F-99539r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Let Everyone permissions apply to anonymous users" to "Disabled".

b

Windows Server 2019 services using Local System that use Negotiate when reverting to NTLM authentication must use the computer identity instead of authenticating anonymously.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000260
Vuln IDs: V-93295
Rule IDs: SV-103383r1_rule

Services using Local System that use Negotiate when reverting to NTLM authentication may gain unauthorized access if allowed to authenticate anonymously versus using the computer identity.

Fix: F-99541r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Allow Local System to use computer identity for NTLM" to "Enabled".

b

Windows Server 2019 must prevent NTLM from falling back to a Null session.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000270
Vuln IDs: V-93297
Rule IDs: SV-103385r1_rule

NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.

Fix: F-99543r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Allow LocalSystem NULL session fallback" to "Disabled".

b

Windows Server 2019 must prevent PKU2U authentication using online identities.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000280
Vuln IDs: V-93299
Rule IDs: SV-103387r1_rule

PKU2U is a peer-to-peer authentication protocol. This setting prevents online identities from authenticating to domain-joined systems. Authentication will be centrally managed with Windows user accounts.

Fix: F-99545r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Allow PKU2U authentication requests to this computer to use online identities" to "Disabled".

c

Windows Server 2019 LAN Manager authentication level must be configured to send NTLMv2 response only and to refuse LM and NTLM.

RMF Control: CM-6
Severity: H
CCI: CCI-000366
Version: WN19-SO-000310
Vuln IDs: V-93301
Rule IDs: SV-103389r1_rule

The Kerberos v5 authentication protocol is the default for authentication of users who are logging on to domain accounts. NTLM, which is less secure, is retained in later Windows versions for compatibility with clients and servers that are running earlier versions of Windows or applications that still use it. It is also used to authenticate logons to standalone computers that are running later versions.

Fix: F-99547r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: LAN Manager authentication level" to "Send NTLMv2 response only. Refuse LM & NTLM".

b

Windows Server 2019 must be configured to at least negotiate signing for LDAP client signing.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000320
Vuln IDs: V-93303
Rule IDs: SV-103391r1_rule

This setting controls the signing requirements for LDAP clients. This must be set to "Negotiate signing" or "Require signing", depending on the environment and type of LDAP server in use.

Fix: F-99549r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: LDAP client signing requirements" to "Negotiate signing" at a minimum.

b

Windows Server 2019 session security for NTLM SSP-based clients must be configured to require NTLMv2 session security and 128-bit encryption.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000330
Vuln IDs: V-93305
Rule IDs: SV-103393r1_rule

Microsoft has implemented a variety of security support providers for use with Remote Procedure Call (RPC) sessions. All of the options must be enabled to ensure the maximum security level.

Fix: F-99551r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Minimum session security for NTLM SSP based (including secure RPC) clients" to "Require NTLMv2 session security" and "Require 128-bit encryption" (all options selected).

b

Windows Server 2019 session security for NTLM SSP-based servers must be configured to require NTLMv2 session security and 128-bit encryption.

RMF Control: CM-6
Severity: M
CCI: CCI-000366
Version: WN19-SO-000340
Vuln IDs: V-93307
Rule IDs: SV-103395r1_rule

Microsoft has implemented a variety of security support providers for use with Remote Procedure Call (RPC) sessions. All of the options must be enabled to ensure the maximum security level.

Fix: F-99553r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Minimum session security for NTLM SSP based (including secure RPC) servers" to "Require NTLMv2 session security" and "Require 128-bit encryption" (all options selected).

a

Windows Server 2019 default permissions of global system objects must be strengthened.

RMF Control: CM-6
Severity: L
CCI: CCI-000366
Version: WN19-SO-000370
Vuln IDs: V-93309
Rule IDs: SV-103397r1_rule

Windows systems maintain a global list of shared system resources such as DOS device names, mutexes, and semaphores. Each type of object is created with a default Discretionary Access Control List (DACL) that specifies who can access the objects with what permissions. When this policy is enabled, the default DACL is stronger, allowing non-administrative users to read shared objects but not to modify shared objects they did not create.

Fix: F-99555r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "System objects: Strengthen default permissions of internal system objects (e.g., Symbolic Links)" to "Enabled".

c

Windows Server 2019 Autoplay must be turned off for non-volume devices.

RMF Control: CM-7
Severity: H
CCI: CCI-001764
Version: WN19-CC-000210
Vuln IDs: V-93373
Rule IDs: SV-103459r1_rule

Allowing AutoPlay to execute may introduce malicious code to a system. AutoPlay begins reading from a drive as soon as media is inserted into the drive. As a result, the setup file of programs or music on audio media may start. This setting will disable AutoPlay for non-volume devices, such as Media Transfer Protocol (MTP) devices.

Fix: F-99617r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> AutoPlay Policies >> "Disallow Autoplay for non-volume devices" to "Enabled".

c

Windows Server 2019 default AutoRun behavior must be configured to prevent AutoRun commands.

RMF Control: CM-7
Severity: H
CCI: CCI-001764
Version: WN19-CC-000220
Vuln IDs: V-93375
Rule IDs: SV-103461r1_rule

Allowing AutoRun commands to execute may introduce malicious code to a system. Configuring this setting prevents AutoRun commands from executing.

Fix: F-99619r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> AutoPlay Policies >> "Set the default behavior for AutoRun" to "Enabled" with "Do not execute any autorun commands" selected.

c

Windows Server 2019 AutoPlay must be disabled for all drives.

RMF Control: CM-7
Severity: H
CCI: CCI-001764
Version: WN19-CC-000230
Vuln IDs: V-93377
Rule IDs: SV-103463r1_rule

Allowing AutoPlay to execute may introduce malicious code to a system. AutoPlay begins reading from a drive as soon media is inserted into the drive. As a result, the setup file of programs or music on audio media may start. By default, AutoPlay is disabled on removable drives, such as the floppy disk drive (but not the CD-ROM drive) and on network drives. Enabling this policy disables AutoPlay on all drives.

Fix: F-99621r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> AutoPlay Policies >> "Turn off AutoPlay" to "Enabled" with "All Drives" selected.

b

Windows Server 2019 must not have the Fax Server role installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000320
Vuln IDs: V-93383
Rule IDs: SV-103469r1_rule

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.

Fix: F-99627r1_fix

Uninstall the "Fax Server" role. Start "Server Manager". Select the server with the role. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Fax Server" on the "Roles" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not have the Peer Name Resolution Protocol installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000340
Vuln IDs: V-93385
Rule IDs: SV-103471r1_rule

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.

Fix: F-99629r1_fix

Uninstall the "Peer Name Resolution Protocol" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Peer Name Resolution Protocol" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not have Simple TCP/IP Services installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000350
Vuln IDs: V-93387
Rule IDs: SV-103473r1_rule

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.

Fix: F-99631r1_fix

Uninstall the "Simple TCP/IP Services" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Simple TCP/IP Services" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not have the TFTP Client installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000370
Vuln IDs: V-93389
Rule IDs: SV-103475r1_rule

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.

Fix: F-99633r1_fix

Uninstall the "TFTP Client" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "TFTP Client" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not the Server Message Block (SMB) v1 protocol installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000380
Vuln IDs: V-93391
Rule IDs: SV-103477r1_rule

SMBv1 is a legacy protocol that uses the MD5 algorithm as part of SMB. MD5 is known to be vulnerable to a number of attacks such as collision and preimage attacks and is not FIPS compliant.

Fix: F-99635r1_fix

Uninstall the SMBv1 protocol. Open "Windows PowerShell" with elevated privileges (run as administrator). Enter "Uninstall-WindowsFeature -Name FS-SMB1 -Restart". (Omit the Restart parameter if an immediate restart of the system cannot be done.) Alternately: Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "SMB 1.0/CIFS File Sharing Support" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must have the Server Message Block (SMB) v1 protocol disabled on the SMB server.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000390
Vuln IDs: V-93393
Rule IDs: SV-103479r1_rule

SMBv1 is a legacy protocol that uses the MD5 algorithm as part of SMB. MD5 is known to be vulnerable to a number of attacks such as collision and preimage attacks as well as not being FIPS compliant.

Fix: F-99637r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> "Configure SMBv1 Server" to "Disabled". The system must be restarted for the change to take effect. This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and "SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 must have the Server Message Block (SMB) v1 protocol disabled on the SMB client.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000400
Vuln IDs: V-93395
Rule IDs: SV-103481r1_rule

SMBv1 is a legacy protocol that uses the MD5 algorithm as part of SMB. MD5 is known to be vulnerable to a number of attacks such as collision and preimage attacks as well as not being FIPS compliant.

Fix: F-99639r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> "Configure SMBv1 client driver" to "Enabled" with "Disable driver (recommended)" selected for "Configure MrxSmb10 driver". The system must be restarted for the changes to take effect. This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and "SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 must not have Windows PowerShell 2.0 installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-00-000410
Vuln IDs: V-93397
Rule IDs: SV-103483r1_rule

Windows PowerShell 5.x added advanced logging features that can provide additional detail when malware has been run on a system. Disabling the Windows PowerShell 2.0 mitigates against a downgrade attack that evades the Windows PowerShell 5.x script block logging feature.

Fix: F-99641r1_fix

Uninstall the "Windows PowerShell 2.0 Engine". Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Windows PowerShell 2.0 Engine" under "Windows PowerShell" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must prevent the display of slide shows on the lock screen.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000010
Vuln IDs: V-93399
Rule IDs: SV-103485r1_rule

Slide shows that are displayed on the lock screen could display sensitive information to unauthorized personnel. Turning off this feature will limit access to the information to a logged-on user.

Fix: F-99643r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Control Panel >> Personalization >> "Prevent enabling lock screen slide show" to "Enabled".

b

Windows Server 2019 must have WDigest Authentication disabled.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000020
Vuln IDs: V-93401
Rule IDs: SV-103487r1_rule

When the WDigest Authentication protocol is enabled, plain-text passwords are stored in the Local Security Authority Subsystem Service (LSASS), exposing them to theft. WDigest is disabled by default in Windows Server 2019. This setting ensures this is enforced.

Fix: F-99645r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> "WDigest Authentication (disabling may require KB2871997)" to "Disabled". This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and " SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 downloading print driver packages over HTTP must be turned off.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000150
Vuln IDs: V-93403
Rule IDs: SV-103489r1_rule

Some features may communicate with the vendor, sending system information or downloading data or components for the feature. Turning off this capability will prevent potentially sensitive information from being sent outside the enterprise and will prevent uncontrolled updates to the system. This setting prevents the computer from downloading print driver packages over HTTP.

Fix: F-99647r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Internet Communication Management >> Internet Communication settings >> "Turn off downloading of print drivers over HTTP" to "Enabled".

b

Windows Server 2019 printing over HTTP must be turned off.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000160
Vuln IDs: V-93405
Rule IDs: SV-103491r1_rule

Some features may communicate with the vendor, sending system information or downloading data or components for the feature. Turning off this capability will prevent potentially sensitive information from being sent outside the enterprise and will prevent uncontrolled updates to the system. This setting prevents the client computer from printing over HTTP, which allows the computer to print to printers on the intranet as well as the Internet.

Fix: F-99649r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Internet Communication Management >> Internet Communication settings >> "Turn off printing over HTTP" to "Enabled".

b

Windows Server 2019 network selection user interface (UI) must not be displayed on the logon screen.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000170
Vuln IDs: V-93407
Rule IDs: SV-103493r1_rule

Enabling interaction with the network selection UI allows users to change connections to available networks without signing in to Windows.

Fix: F-99651r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Do not display network selection UI" to "Enabled".

a

Windows Server 2019 Application Compatibility Program Inventory must be prevented from collecting data and sending the information to Microsoft.

RMF Control: CM-7
Severity: L
CCI: CCI-000381
Version: WN19-CC-000200
Vuln IDs: V-93409
Rule IDs: SV-103495r1_rule

Some features may communicate with the vendor, sending system information or downloading data or components for the feature. Turning off this capability will prevent potentially sensitive information from being sent outside the enterprise and will prevent uncontrolled updates to the system. This setting will prevent the Program Inventory from collecting data about a system and sending the information to Microsoft.

Fix: F-99653r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Application Compatibility >> "Turn off Inventory Collector" to "Enabled".

b

Windows Server 2019 Windows Defender SmartScreen must be enabled.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000300
Vuln IDs: V-93411
Rule IDs: SV-103497r2_rule

Windows Defender SmartScreen helps protect systems from programs downloaded from the internet that may be malicious. Enabling SmartScreen can block potentially malicious programs or warn users.

Fix: F-99655r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Configure Windows Defender SmartScreen" to "Enabled" with either option "Warn" or "Warn and prevent bypass" selected. Windows 2019 includes duplicate policies for this setting. It can also be configured under Computer Configuration >> Administrative Templates >> Windows Components >> Windows Defender SmartScreen >> Explorer.

b

Windows Server 2019 must disable Basic authentication for RSS feeds over HTTP.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000400
Vuln IDs: V-93413
Rule IDs: SV-103499r1_rule

Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.

Fix: F-99657r1_fix

The default behavior is for the Windows RSS platform to not use Basic authentication over HTTP connections. If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> RSS Feeds >> "Turn on Basic feed authentication over HTTP" to "Not Configured" or "Disabled".

b

Windows Server 2019 must prevent Indexing of encrypted files.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-CC-000410
Vuln IDs: V-93415
Rule IDs: SV-103501r1_rule

Indexing of encrypted files may expose sensitive data. This setting prevents encrypted files from being indexed.

Fix: F-99659r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Search >> "Allow indexing of encrypted files" to "Disabled".

b

Windows Server 2019 local users on domain-joined member servers must not be enumerated.

RMF Control: CM-7
Severity: M
CCI: CCI-000381
Version: WN19-MS-000030
Vuln IDs: V-93419
Rule IDs: SV-103505r1_rule

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.

Fix: F-99663r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Enumerate local users on domain-joined computers" to "Disabled".

b

Windows Server 2019 must not have the Microsoft FTP service installed unless required by the organization.

RMF Control: CM-7
Severity: M
CCI: CCI-000382
Version: WN19-00-000330
Vuln IDs: V-93421
Rule IDs: SV-103507r1_rule

Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption.

Fix: F-99665r1_fix

Uninstall the "FTP Server" role. Start "Server Manager". Select the server with the role. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "FTP Server" under "Web Server (IIS)" on the "Roles" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not have the Telnet Client installed.

RMF Control: CM-7
Severity: M
CCI: CCI-000382
Version: WN19-00-000360
Vuln IDs: V-93423
Rule IDs: SV-103509r1_rule

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.

Fix: F-99667r1_fix

Uninstall the "Telnet Client" feature. Start "Server Manager". Select the server with the feature. Scroll down to "ROLES AND FEATURES" in the right pane. Select "Remove Roles and Features" from the drop-down "TASKS" list. Select the appropriate server on the "Server Selection" page and click "Next". Deselect "Telnet Client" on the "Features" page. Click "Next" and "Remove" as prompted.

b

Windows Server 2019 must not save passwords in the Remote Desktop Client.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-CC-000340
Vuln IDs: V-93425
Rule IDs: SV-103511r1_rule

Saving passwords in the Remote Desktop Client could allow an unauthorized user to establish a remote desktop session to another system. The system must be configured to prevent users from saving passwords in the Remote Desktop Client. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99669r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Connection Client >> "Do not allow passwords to be saved" to "Enabled".

b

Windows Server 2019 Remote Desktop Services must always prompt a client for passwords upon connection.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-CC-000360
Vuln IDs: V-93427
Rule IDs: SV-103513r1_rule

This setting controls the ability of users to supply passwords automatically as part of their remote desktop connection. Disabling this setting would allow anyone to use the stored credentials in a connection item to connect to the terminal server. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99671r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Security >> "Always prompt for password upon connection" to "Enabled".

b

Windows Server 2019 Windows Remote Management (WinRM) service must not store RunAs credentials.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-CC-000520
Vuln IDs: V-93429
Rule IDs: SV-103515r1_rule

Storage of administrative credentials could allow unauthorized access. Disallowing the storage of RunAs credentials for Windows Remote Management will prevent them from being used with plug-ins. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99673r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Service >> "Disallow WinRM from storing RunAs credentials" to "Enabled".

b

Windows Server 2019 User Account Control approval mode for the built-in Administrator must be enabled.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-SO-000380
Vuln IDs: V-93431
Rule IDs: SV-103517r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting configures the built-in Administrator account so that it runs in Admin Approval Mode. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99675r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Admin Approval Mode for the Built-in Administrator account" to "Enabled".

b

Windows Server 2019 User Account Control must automatically deny standard user requests for elevation.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-SO-000410
Vuln IDs: V-93433
Rule IDs: SV-103519r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting controls the behavior of elevation when requested by a standard user account. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99677r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Behavior of the elevation prompt for standard users" to "Automatically deny elevation requests".

b

Windows Server 2019 User Account Control must run all administrators in Admin Approval Mode, enabling UAC.

RMF Control: IA-11
Severity: M
CCI: CCI-002038
Version: WN19-SO-000440
Vuln IDs: V-93435
Rule IDs: SV-103521r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting enables UAC. Satisfies: SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00156

Fix: F-99679r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Run all administrators in Admin Approval Mode" to "Enabled".

b

Windows Server 2019 Kerberos user logon restrictions must be enforced.

RMF Control: IA-2
Severity: M
CCI: CCI-001941
Version: WN19-DC-000020
Vuln IDs: V-93443
Rule IDs: SV-103529r1_rule

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 enabled by default, which is the most secure setting for validating that access to target resources is not circumvented. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Fix: F-99687r1_fix

Configure the policy value in the Default Domain Policy for Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Enforce user logon restrictions" to "Enabled".

b

Windows Server 2019 Kerberos service ticket maximum lifetime must be limited to 600 minutes or less.

RMF Control: IA-2
Severity: M
CCI: CCI-001941
Version: WN19-DC-000030
Vuln IDs: V-93445
Rule IDs: SV-103531r1_rule

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 connections with servers. Ongoing operations are not interrupted if the session ticket used to authenticate the connection expires during the connection. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Fix: F-99689r1_fix

Configure the policy value in the Default Domain Policy for Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Maximum lifetime for service ticket" to a maximum of "600" minutes, but not "0", which equates to "Ticket doesn't expire".

b

Windows Server 2019 Kerberos user ticket lifetime must be limited to 10 hours or less.

RMF Control: IA-2
Severity: M
CCI: CCI-001941
Version: WN19-DC-000040
Vuln IDs: V-93447
Rule IDs: SV-103533r1_rule

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 limited. This policy controls how long TGTs can be renewed. With Kerberos, the user's initial authentication to the domain controller results in a TGT, which is then used to request Service Tickets to resources. Upon startup, each computer gets a TGT before requesting a service ticket to the domain controller and any other computers it needs to access. For services that start up under a specified user account, users must always get a TGT first and then get Service Tickets to all computers and services accessed. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Fix: F-99691r1_fix

Configure the policy value in the Default Domain Policy for Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Maximum lifetime for user ticket" to a maximum of "10" hours but not "0", which equates to "Ticket doesn't expire".

b

Windows Server 2019 Kerberos policy user ticket renewal maximum lifetime must be limited to seven days or less.

RMF Control: IA-2
Severity: M
CCI: CCI-001941
Version: WN19-DC-000050
Vuln IDs: V-93449
Rule IDs: SV-103535r1_rule

This setting determines the period of time (in days) during which a user's Ticket Granting Ticket (TGT) may be renewed. This security configuration limits the amount of time an attacker has to crack the TGT and gain access. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Fix: F-99693r1_fix

Configure the policy value in the Default Domain Policy for Computer Configuration >> Policies >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Maximum lifetime for user ticket renewal" to a maximum of "7" days or less.

b

Windows Server 2019 computer clock synchronization tolerance must be limited to five minutes or less.

RMF Control: IA-2
Severity: M
CCI: CCI-001941
Version: WN19-DC-000060
Vuln IDs: V-93451
Rule IDs: SV-103537r1_rule

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 clocks synchronous. In order to prevent replay attacks, Kerberos uses timestamps as part of its protocol definition. For timestamps to work properly, the clocks of the client and the server need to be in sync as much as possible. Satisfies: SRG-OS-000112-GPOS-00057, SRG-OS-000113-GPOS-00058

Fix: F-99695r1_fix

Configure the policy value in the Default Domain Policy for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Kerberos Policy >> "Maximum tolerance for computer clock synchronization" to a maximum of "5" minutes or less.

b

Windows Server 2019 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and standalone systems.

RMF Control: IA-3
Severity: M
CCI: CCI-001967
Version: WN19-MS-000040
Vuln IDs: V-93453
Rule IDs: SV-103539r1_rule

Unauthenticated RPC clients may allow anonymous access to sensitive information. Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections.

Fix: F-99697r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> "Restrict Unauthenticated RPC clients" to "Enabled" with "Authenticated" selected.

b

Windows Server 2019 computer account password must not be prevented from being reset.

RMF Control: IA-3
Severity: M
CCI: CCI-001967
Version: WN19-SO-000090
Vuln IDs: V-93455
Rule IDs: SV-103541r1_rule

Computer account passwords are changed automatically on a regular basis. Disabling automatic password changes can make the system more vulnerable to malicious access. Frequent password changes can be a significant safeguard for the system. A new password for the computer account will be generated every 30 days.

Fix: F-99699r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Disable machine account password changes" to "Disabled".

b

Windows Server 2019 must have the built-in Windows password complexity policy enabled.

RMF Control: IA-5
Severity: M
CCI: CCI-000192
Version: WN19-AC-000080
Vuln IDs: V-93459
Rule IDs: SV-103545r1_rule

The use of complex passwords increases their strength against attack. The built-in Windows password complexity policy requires passwords to contain at least three of the four types of characters (numbers, uppercase and lowercase letters, and special characters) and prevents the inclusion of user names or parts of user names. Satisfies: SRG-OS-000069-GPOS-00037, SRG-OS-000070-GPOS-00038, SRG-OS-000071-GPOS-00039, SRG-OS-000266-GPOS-00101

Fix: F-99703r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Password must meet complexity requirements" to "Enabled".

b

Windows Server 2019 minimum password length must be configured to 14 characters.

RMF Control: IA-5
Severity: M
CCI: CCI-000205
Version: WN19-AC-000070
Vuln IDs: V-93463
Rule IDs: SV-103549r1_rule

Information systems not protected with strong password schemes (including passwords of minimum length) provide the opportunity for anyone to crack the password, thus gaining access to the system and compromising the device, information, or the local network.

Fix: F-99707r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Minimum password length" to "14" characters.

c

Windows Server 2019 reversible password encryption must be disabled.

RMF Control: IA-5
Severity: H
CCI: CCI-000196
Version: WN19-AC-000090
Vuln IDs: V-93465
Rule IDs: SV-103551r1_rule

Storing passwords using reversible encryption is essentially the same as storing clear-text versions of the passwords, which are easily compromised. For this reason, this policy must never be enabled.

Fix: F-99709r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Store passwords using reversible encryption" to "Disabled".

c

Windows Server 2019 must be configured to prevent the storage of the LAN Manager hash of passwords.

RMF Control: IA-5
Severity: H
CCI: CCI-000196
Version: WN19-SO-000300
Vuln IDs: V-93467
Rule IDs: SV-103553r1_rule

The LAN Manager hash uses a weak encryption algorithm and there are several tools available that use this hash to retrieve account passwords. This setting controls whether a LAN Manager hash of the password is stored in the SAM the next time the password is changed.

Fix: F-99711r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Do not store LAN Manager hash value on next password change" to "Enabled".

b

Windows Server 2019 unencrypted passwords must not be sent to third-party Server Message Block (SMB) servers.

RMF Control: IA-5
Severity: M
CCI: CCI-000197
Version: WN19-SO-000180
Vuln IDs: V-93469
Rule IDs: SV-103555r1_rule

Some non-Microsoft SMB servers only support unencrypted (plain-text) password authentication. Sending plain-text passwords across the network when authenticating to an SMB server reduces the overall security of the environment. Check with the vendor of the SMB server to determine if there is a way to support encrypted password authentication.

Fix: F-99713r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft Network Client: Send unencrypted password to third-party SMB servers" to "Disabled".

b

Windows Server 2019 minimum password age must be configured to at least one day.

RMF Control: IA-5
Severity: M
CCI: CCI-000198
Version: WN19-AC-000060
Vuln IDs: V-93471
Rule IDs: SV-103557r1_rule

Permitting passwords to be changed in immediate succession within the same day allows users to cycle passwords through their history database. This enables users to effectively negate the purpose of mandating periodic password changes.

Fix: F-99715r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Minimum password age" to at least "1" day.

b

Windows Server 2019 maximum password age must be configured to 60 days or less.

RMF Control: IA-5
Severity: M
CCI: CCI-000199
Version: WN19-AC-000050
Vuln IDs: V-93477
Rule IDs: SV-103563r1_rule

The longer a password is in use, the greater the opportunity for someone to gain unauthorized knowledge of the passwords. Scheduled changing of passwords hinders the ability of unauthorized system users to crack passwords and gain access to a system.

Fix: F-99721r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Maximum password age" to "60" days or less (excluding "0", which is unacceptable).

b

Windows Server 2019 password history must be configured to 24 passwords remembered.

RMF Control: IA-5
Severity: M
CCI: CCI-000200
Version: WN19-AC-000040
Vuln IDs: V-93479
Rule IDs: SV-103565r1_rule

A system is more vulnerable to unauthorized access when system users recycle the same password several times without being required to change to a unique password on a regularly scheduled basis. This enables users to effectively negate the purpose of mandating periodic password changes. The default value is "24" for Windows domain systems. DoD has decided this is the appropriate value for all Windows systems.

Fix: F-99723r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Account Policies >> Password Policy >> "Enforce password history" to "24" passwords remembered.

b

Windows Server 2019 must have the DoD Root Certificate Authority (CA) certificates installed in the Trusted Root Store.

RMF Control: IA-5
Severity: M
CCI: CCI-000185
Version: WN19-PK-000010
Vuln IDs: V-93487
Rule IDs: SV-103573r1_rule

To ensure secure DoD websites and DoD-signed code are properly validated, the system must trust the DoD Root CAs. The DoD root certificates will ensure that the trust chain is established for server certificates issued from the DoD CAs. Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000403-GPOS-00182

Fix: F-99731r1_fix

Install the DoD Root CA certificates: DoD Root CA 2 DoD Root CA 3 DoD Root CA 4 DoD Root CA 5 The InstallRoot tool is available on IASE at http://iase.disa.mil/pki-pke/Pages/tools.aspx.

b

Windows Server 2019 must have the DoD Interoperability Root Certificate Authority (CA) cross-certificates installed in the Untrusted Certificates Store on unclassified systems.

RMF Control: IA-5
Severity: M
CCI: CCI-000185
Version: WN19-PK-000020
Vuln IDs: V-93489
Rule IDs: SV-103575r1_rule

To ensure users do not experience denial of service when performing certificate-based authentication to DoD websites due to the system chaining to a root other than DoD Root CAs, the DoD Interoperability Root CA cross-certificates must be installed in the Untrusted Certificate Store. This requirement only applies to unclassified systems. Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000403-GPOS-00182

Fix: F-99733r1_fix

Install the DoD Interoperability Root CA cross-certificates on unclassified systems. Issued To - Issued By - Thumbprint DoD Root CA 2 - DoD Interoperability Root CA 1 - 22BBE981F0694D246CC1472ED2B021DC8540A22F DoD Root CA 3 - DoD Interoperability Root CA 2 - FFAD03329B9E527A43EEC66A56F9CBB5393E6E13 DoD Root CA 3 - DoD Interoperability Root CA 2 - FCE1B1E25374DD94F5935BEB86CA643D8C8D1FF4 Administrators should run the Federal Bridge Certification Authority (FBCA) Cross-Certificate Removal Tool once as an administrator and once as the current user. The FBCA Cross-Certificate Remover Tool and User Guide are available on IASE at http://iase.disa.mil/pki-pke/Pages/tools.aspx.

b

Windows Server 2019 must have the US DoD CCEB Interoperability Root CA cross-certificates in the Untrusted Certificates Store on unclassified systems.

RMF Control: IA-5
Severity: M
CCI: CCI-000185
Version: WN19-PK-000030
Vuln IDs: V-93491
Rule IDs: SV-103577r1_rule

To ensure users do not experience denial of service when performing certificate-based authentication to DoD websites due to the system chaining to a root other than DoD Root CAs, the US DoD CCEB Interoperability Root CA cross-certificates must be installed in the Untrusted Certificate Store. This requirement only applies to unclassified systems. Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000403-GPOS-00182

Fix: F-99735r1_fix

Install the US DoD CCEB Interoperability Root CA cross-certificate on unclassified systems. Issued To - Issued By - Thumbprint DoD Root CA 2 - US DoD CCEB Interoperability Root CA 1 - DA36FAF56B2F6FBA1604F5BE46D864C9FA013BA3 DoD Root CA 3 - US DoD CCEB Interoperability Root CA 2 - 929BF3196896994C0A201DF4A5B71F603FEFBF2E Administrators should run the Federal Bridge Certification Authority (FBCA) Cross-Certificate Removal Tool once as an administrator and once as the current user. The FBCA Cross-Certificate Remover Tool and User Guide are available on IASE at http://iase.disa.mil/pki-pke/Pages/tools.aspx.

b

Windows Server 2019 users must be required to enter a password to access private keys stored on the computer.

RMF Control: IA-5
Severity: M
CCI: CCI-000186
Version: WN19-SO-000350
Vuln IDs: V-93493
Rule IDs: SV-103579r1_rule

If the private key is discovered, an attacker can use the key to authenticate as an authorized user and gain access to the network infrastructure. The cornerstone of the PKI is the private key used to encrypt or digitally sign information. If the private key is stolen, this will lead to the compromise of the authentication and non-repudiation gained through PKI because the attacker can use the private key to digitally sign documents and pretend to be the authorized user. Both the holders of a digital certificate and the issuing authority must protect the computers, storage devices, or whatever they use to keep the private keys.

Fix: F-99737r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "System cryptography: Force strong key protection for user keys stored on the computer" to "User must enter a password each time they use a key".

b

Windows Server 2019 Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites.

RMF Control: IA-7
Severity: M
CCI: CCI-000803
Version: WN19-SO-000290
Vuln IDs: V-93495
Rule IDs: SV-103581r1_rule

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 versions of Windows where RC4 encryption is enabled, selecting "The other domain supports Kerberos AES Encryption" on domain trusts, may be required to allow client communication across the trust relationship.

Fix: F-99739r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Configure encryption types allowed for Kerberos" to "Enabled" with only the following selected: AES128_HMAC_SHA1 AES256_HMAC_SHA1 Future encryption types Note: Organizations with domain controllers running earlier versions of Windows where RC4 encryption is enabled, selecting "The other domain supports Kerberos AES Encryption" on domain trusts, may be required to allow client communication across the trust relationship.

b

Windows Server 2019 must have the built-in guest account disabled.

RMF Control: IA-8
Severity: M
CCI: CCI-000804
Version: WN19-SO-000010
Vuln IDs: V-93497
Rule IDs: SV-103583r1_rule

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 initialized during the installation of the operating system with no password assigned.

Fix: F-99741r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Accounts: Guest account status" to "Disabled".

b

Windows Server 2019 Windows Remote Management (WinRM) client must not allow unencrypted traffic.

RMF Control: MA-4
Severity: M
CCI: CCI-002890
Version: WN19-CC-000480
Vuln IDs: V-93499
Rule IDs: SV-103585r1_rule

Unencrypted remote access to a system can allow sensitive information to be compromised. Windows remote management connections must be encrypted to prevent this. Satisfies: SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174

Fix: F-99743r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Client >> "Allow unencrypted traffic" to "Disabled".

b

Windows Server 2019 Windows Remote Management (WinRM) service must not allow unencrypted traffic.

RMF Control: MA-4
Severity: M
CCI: CCI-002890
Version: WN19-CC-000510
Vuln IDs: V-93501
Rule IDs: SV-103587r1_rule

Unencrypted remote access to a system can allow sensitive information to be compromised. Windows remote management connections must be encrypted to prevent this. Satisfies: SRG-OS-000393-GPOS-00173, SRG-OS-000394-GPOS-00174

Fix: F-99745r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Service >> "Allow unencrypted traffic" to "Disabled".

c

Windows Server 2019 Windows Remote Management (WinRM) client must not use Basic authentication.

RMF Control: MA-4
Severity: H
CCI: CCI-000877
Version: WN19-CC-000470
Vuln IDs: V-93503
Rule IDs: SV-103589r1_rule

Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.

Fix: F-99747r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Client >> "Allow Basic authentication" to "Disabled".

b

Windows Server 2019 Windows Remote Management (WinRM) client must not use Digest authentication.

RMF Control: MA-4
Severity: M
CCI: CCI-000877
Version: WN19-CC-000490
Vuln IDs: V-93505
Rule IDs: SV-103591r1_rule

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.

Fix: F-99749r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Client >> "Disallow Digest authentication" to "Enabled".

c

Windows Server 2019 Windows Remote Management (WinRM) service must not use Basic authentication.

RMF Control: MA-4
Severity: H
CCI: CCI-000877
Version: WN19-CC-000500
Vuln IDs: V-93507
Rule IDs: SV-103593r1_rule

Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.

Fix: F-99751r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Windows Remote Management (WinRM) >> WinRM Service >> "Allow Basic authentication" to "Disabled".

b

Windows Server 2019 must be configured to use FIPS-compliant algorithms for encryption, hashing, and signing.

RMF Control: SC-13
Severity: M
CCI: CCI-002450
Version: WN19-SO-000360
Vuln IDs: V-93511
Rule IDs: SV-103597r1_rule

This setting ensures the system uses algorithms that are FIPS-compliant for encryption, hashing, and signing. FIPS-compliant algorithms meet specific standards established by the U.S. Government and must be the algorithms used for all OS encryption functions.

Fix: F-99755r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing" to "Enabled".

b

Windows Server 2019 administrator accounts must not be enumerated during elevation.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-CC-000240
Vuln IDs: V-93517
Rule IDs: SV-103603r1_rule

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 username and password to elevate a running application.

Fix: F-99761r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Credential User Interface >> "Enumerate administrator accounts on elevation" to "Disabled".

b

Windows Server 2019 local administrator accounts must have their privileged token filtered to prevent elevated privileges from being used over the network on domain-joined member servers.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-MS-000020
Vuln IDs: V-93519
Rule IDs: SV-103605r1_rule

A compromised local administrator account can provide means for an attacker to move laterally between domain systems. With User Account Control enabled, filtering the privileged token for local administrator accounts will prevent the elevated privileges of these accounts from being used over the network.

Fix: F-99763r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MS Security Guide >> "Apply UAC restrictions to local accounts on network logons" to "Enabled". This policy setting requires the installation of the SecGuide custom templates included with the STIG package. "SecGuide.admx" and " SecGuide.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 UIAccess applications must not be allowed to prompt for elevation without using the secure desktop.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-SO-000390
Vuln IDs: V-93521
Rule IDs: SV-103607r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting prevents User Interface Accessibility programs from disabling the secure desktop for elevation prompts.

Fix: F-99765r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Allow UIAccess applications to prompt for elevation without using the secure desktop" to "Disabled".

b

Windows Server 2019 User Account Control must, at a minimum, prompt administrators for consent on the secure desktop.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-SO-000400
Vuln IDs: V-93523
Rule IDs: SV-103609r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting configures the elevation requirements for logged-on administrators to complete a task that requires raised privileges.

Fix: F-99767r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Behavior of the elevation prompt for administrators in Admin Approval Mode" to "Prompt for consent on the secure desktop". The more secure option for this setting, "Prompt for credentials on the secure desktop", would also be acceptable.

b

Windows Server 2019 User Account Control must be configured to detect application installations and prompt for elevation.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-SO-000420
Vuln IDs: V-93525
Rule IDs: SV-103611r1_rule

User Account Control (UAC) is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting requires Windows to respond to application installation requests by prompting for credentials.

Fix: F-99769r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Detect application installations and prompt for elevation" to "Enabled".

b

Windows Server 2019 User Account Control (UAC) must only elevate UIAccess applications that are installed in secure locations.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-SO-000430
Vuln IDs: V-93527
Rule IDs: SV-103613r1_rule

UAC is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting configures Windows to only allow applications installed in a secure location on the file system, such as the Program Files or the Windows\System32 folders, to run with elevated privileges.

Fix: F-99771r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Only elevate UIAccess applications that are installed in secure locations" to "Enabled".

b

Windows Server 2019 User Account Control (UAC) must virtualize file and registry write failures to per-user locations.

RMF Control: SC-3
Severity: M
CCI: CCI-001084
Version: WN19-SO-000450
Vuln IDs: V-93529
Rule IDs: SV-103615r1_rule

UAC is a security mechanism for limiting the elevation of privileges, including administrative accounts, unless authorized. This setting configures non-UAC-compliant applications to run in virtualized file and registry entries in per-user locations, allowing them to run.

Fix: F-99773r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "User Account Control: Virtualize file and registry write failures to per-user locations" to "Enabled".

b

Windows Server 2019 Remote Desktop Services must prevent drive redirection.

RMF Control: SC-4
Severity: M
CCI: CCI-001090
Version: WN19-CC-000350
Vuln IDs: V-93533
Rule IDs: SV-103619r1_rule

Preventing users from sharing the local drives on their client computers with Remote Session Hosts that they access helps reduce possible exposure of sensitive data.

Fix: F-99777r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> Remote Desktop Services >> Remote Desktop Session Host >> Device and Resource Redirection >> "Do not allow drive redirection" to "Enabled".

c

Windows Server 2019 must not allow anonymous enumeration of shares.

RMF Control: SC-4
Severity: H
CCI: CCI-001090
Version: WN19-SO-000230
Vuln IDs: V-93537
Rule IDs: SV-103623r1_rule

Allowing anonymous logon users (null session connections) to list all account names and enumerate all shared resources can provide a map of potential points to attack the system.

Fix: F-99781r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Do not allow anonymous enumeration of SAM accounts and shares" to "Enabled".

c

Windows Server 2019 must restrict anonymous access to Named Pipes and Shares.

RMF Control: SC-4
Severity: H
CCI: CCI-001090
Version: WN19-SO-000250
Vuln IDs: V-93539
Rule IDs: SV-103625r1_rule

Allowing anonymous access to named pipes or shares provides the potential for unauthorized system access. This setting restricts access to those defined in "Network access: Named Pipes that can be accessed anonymously" and "Network access: Shares that can be accessed anonymously", both of which must be blank under other requirements.

Fix: F-99783r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict anonymous access to Named Pipes and Shares" to "Enabled".

a

Windows Server 2019 must be configured to ignore NetBIOS name release requests except from WINS servers.

RMF Control: SC-5
Severity: L
CCI: CCI-002385
Version: WN19-CC-000060
Vuln IDs: V-93541
Rule IDs: SV-103627r1_rule

Configuring the system to ignore name release requests, except from WINS servers, prevents a denial of service (DoS) attack. The DoS consists of sending a NetBIOS name release request to the server for each entry in the server's cache, causing a response delay in the normal operation of the server's WINS resolution capability.

Fix: F-99785r1_fix

Configure the policy value for Computer Configuration >> Administrative Templates >> MSS (Legacy) >> "MSS: (NoNameReleaseOnDemand) Allow the computer to ignore NetBIOS name release requests except from WINS servers" to "Enabled". This policy setting requires the installation of the MSS-Legacy custom templates included with the STIG package. "MSS-Legacy.admx" and "MSS-Legacy.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

b

Windows Server 2019 domain controllers must require LDAP access signing.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-DC-000320
Vuln IDs: V-93545
Rule IDs: SV-103631r1_rule

Unsigned network traffic is susceptible to man-in-the-middle attacks, where an intruder captures packets between the server and the client and modifies them before forwarding them to the client. In the case of an LDAP server, this means that an attacker could cause a client to make decisions based on false records from the LDAP directory. The risk of an attacker pulling this off can be decreased by implementing strong physical security measures to protect the network infrastructure. Furthermore, implementing Internet Protocol security (IPsec) authentication header mode (AH), which performs mutual authentication and packet integrity for Internet Protocol (IP) traffic, can make all types of man-in-the-middle attacks extremely difficult. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99789r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain controller: LDAP server signing requirements" to "Require signing".

b

Windows Server 2019 setting Domain member: Digitally encrypt or sign secure channel data (always) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000060
Vuln IDs: V-93547
Rule IDs: SV-103633r1_rule

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but not all information is encrypted. If this policy is enabled, outgoing secure channel traffic will be encrypted and signed. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99791r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Digitally encrypt or sign secure channel data (always)" to "Enabled".

b

Windows Server 2019 setting Domain member: Digitally encrypt secure channel data (when possible) must be configured to enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000070
Vuln IDs: V-93549
Rule IDs: SV-103635r1_rule

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but not all information is encrypted. If this policy is enabled, outgoing secure channel traffic will be encrypted. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99793r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Digitally encrypt secure channel data (when possible)" to "Enabled".

b

Windows Server 2019 setting Domain member: Digitally sign secure channel data (when possible) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000080
Vuln IDs: V-93551
Rule IDs: SV-103637r1_rule

Requests sent on the secure channel are authenticated, and sensitive information (such as passwords) is encrypted, but the channel is not integrity checked. If this policy is enabled, outgoing secure channel traffic will be signed. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99795r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Digitally sign secure channel data (when possible)" to "Enabled".

b

Windows Server 2019 must be configured to require a strong session key.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000110
Vuln IDs: V-93553
Rule IDs: SV-103639r1_rule

A computer connecting to a domain controller will establish a secure channel. The secure channel connection may be subject to compromise, such as hijacking or eavesdropping, if strong session keys are not used to establish the connection. Requiring strong session keys enforces 128-bit encryption between systems. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99797r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Domain member: Require strong (Windows 2000 or Later) session key" to "Enabled".

b

Windows Server 2019 setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000160
Vuln IDs: V-93555
Rule IDs: SV-103641r1_rule

The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB client will only communicate with an SMB server that performs SMB packet signing. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99799r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (always)" to "Enabled".

b

Windows Server 2019 setting Microsoft network client: Digitally sign communications (if server agrees) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000170
Vuln IDs: V-93557
Rule IDs: SV-103643r1_rule

The server message block (SMB) protocol provides the basis for many network operations. If this policy is enabled, the SMB client will request packet signing when communicating with an SMB server that is enabled or required to perform SMB packet signing. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99801r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network client: Digitally sign communications (if server agrees)" to "Enabled".

b

Windows Server 2019 setting Microsoft network server: Digitally sign communications (always) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000190
Vuln IDs: V-93559
Rule IDs: SV-103645r1_rule

The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB server will only communicate with an SMB client that performs SMB packet signing. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99803r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network server: Digitally sign communications (always)" to "Enabled".

b

Windows Server 2019 setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to Enabled.

RMF Control: SC-8
Severity: M
CCI: CCI-002418
Version: WN19-SO-000200
Vuln IDs: V-93561
Rule IDs: SV-103647r1_rule

The server message block (SMB) protocol provides the basis for many network operations. Digitally signed SMB packets aid in preventing man-in-the-middle attacks. If this policy is enabled, the SMB server will negotiate SMB packet signing as requested by the client. Satisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188

Fix: F-99805r1_fix

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Microsoft network server: Digitally sign communications (if client agrees)" to "Enabled".

b

Windows Server 2019 Explorer Data Execution Prevention must be enabled.

RMF Control: SI-16
Severity: M
CCI: CCI-002824
Version: WN19-CC-000310
Vuln IDs: V-93563
Rule IDs: SV-103649r1_rule

Data Execution Prevention provides additional protection by performing checks on memory to help prevent malicious code from running. This setting will prevent Data Execution Prevention from being turned off for File Explorer.

Fix: F-99807r1_fix

The default behavior is for data execution prevention to be turned on for File Explorer. If this needs to be corrected, configure the policy value for Computer Configuration >> Administrative Templates >> Windows Components >> File Explorer >> "Turn off Data Execution Prevention for Explorer" to "Not Configured" or "Disabled".