Windows Server 2016 Security Technical Implementation Guide

U_MS_Windows_Server_2016_STIG_V1R8_Manual-xccdf.xml

This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: [email protected]
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Version / Release: V1R8

Published: 2019-03-13

Updated At: 2019-05-04 00:36:45

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Vuln Rule Version CCI Severity Title Description
SV-87869r1_rule WN16-00-000010 CCI-000366 HIGH Users with Administrative privileges must have separate accounts for administrative duties and normal operational tasks. Using a privileged account to perform routine functions makes the computer vulnerable to malicious software inadvertently introduced during a session that has been granted full privileges.
SV-87871r1_rule WN16-DC-000010 CCI-002235 HIGH Only administrators responsible for the domain controller must have Administrator rights on the system. An account that does not have Administrator duties must not have Administrator rights. Such rights would allow the account to bypass or modify required security restrictions on that machine and make it vulnerable to attack. System administrators must log on to systems using only accounts with the minimum level of authority necessary. Standard user accounts must not be members of the built-in Administrators group.
SV-87873r2_rule WN16-MS-000010 CCI-002235 HIGH Only administrators responsible for the member server or standalone system must have Administrator rights on the system. An account that does not have Administrator duties must not have Administrator rights. Such rights would allow the account to bypass or modify required security restrictions on that machine and make it vulnerable to attack. System administrators must log on to systems using only accounts with the minimum level of authority necessary. For domain-joined member servers, the Domain Admins group must be replaced by a domain member server administrator group (see V-36433 in the Active Directory Domain STIG). Restricting highly privileged accounts from the local Administrators group helps mitigate the risk of privilege escalation resulting from credential theft attacks. Standard user accounts must not be members of the built-in Administrators group.
SV-87875r2_rule WN16-00-000030 CCI-000199 MEDIUM Passwords for the built-in Administrator account must be changed at least every 60 days. The longer a password is in use, the greater the opportunity for someone to gain unauthorized knowledge of the password. The built-in Administrator account is not generally used and its password not may be changed as frequently as necessary. Changing the password for the built-in Administrator account on a regular basis will limit its exposure. Organizations that use an automated tool, such Microsoft's Local Administrator Password Solution (LAPS), on domain-joined systems can configure this to occur more frequently. LAPS will change the password every "30" days by default.
SV-87877r1_rule WN16-00-000040 CCI-000366 HIGH Administrative accounts must not be used with applications that access the Internet, such as web browsers, or with potential Internet sources, such as email. Using applications that access the Internet or have potential Internet sources using administrative privileges exposes a system to compromise. If a flaw in an application is exploited while running as a privileged user, the entire system could be compromised. Web browsers and email are common attack vectors for introducing malicious code and must not be run with an administrative account. Since administrative accounts may generally change or work around technical restrictions for running a web browser or other applications, it is essential that policy require administrative accounts to not access the Internet or use applications such as email. The policy should define specific exceptions for local service administration. These exceptions may include HTTP(S)-based tools that are used for the administration of the local system, services, or attached devices. Whitelisting can be used to enforce the policy to ensure compliance.
SV-87879r1_rule WN16-00-000050 CCI-000366 MEDIUM Members of the Backup Operators group must have separate accounts for backup duties and normal operational tasks. Backup Operators are able to read and write to any file in the system, regardless of the rights assigned to it. Backup and restore rights permit users to circumvent the file access restrictions present on NTFS disk drives for backup and restore purposes. Members of the Backup Operators group must have separate logon accounts for performing backup duties.
SV-87881r1_rule WN16-00-000060 CCI-000205 MEDIUM Manually managed application account passwords must be at least 15 characters in length. Application/service account passwords must be of sufficient length to prevent being easily cracked. Application/service accounts that are manually managed must have passwords at least 15 characters in length.
SV-87883r2_rule WN16-00-000070 CCI-000366 MEDIUM Manually managed application account passwords must be changed at least annually or when a system administrator with knowledge of the password leaves the organization. Setting application account passwords to expire may cause applications to stop functioning. However, not changing them on a regular basis exposes them to attack. If managed service accounts are used, this alleviates the need to manually change application account passwords.
SV-87885r2_rule WN16-00-000080 CCI-000764 MEDIUM Shared user accounts must not be permitted on the system. Shared accounts (accounts where two or more people log on with the same user identification) do not provide adequate identification and authentication. There is no way to provide for nonrepudiation or individual accountability for system access and resource usage.
SV-87887r2_rule WN16-00-000090 CCI-001774 MEDIUM Windows Server 2016 must employ a deny-all, permit-by-exception policy to allow the execution of authorized software programs. Using a whitelist provides a configuration management method to allow the execution of only authorized software. Using only authorized software decreases risk by limiting the number of potential vulnerabilities. The organization must identify authorized software programs and only permit execution of authorized software. The process used to identify software programs that are authorized to execute on organizational information systems is commonly referred to as whitelisting.
SV-87889r1_rule WN16-00-000100 CCI-000366 LOW Domain-joined systems must have a Trusted Platform Module (TPM) enabled and ready for use. Credential Guard uses virtualization-based security to protect data that could be used in credential theft attacks if compromised. A number of system requirements must be met in order for Credential Guard to be configured and enabled properly. Without a TPM enabled and ready for use, Credential Guard keys are stored in a less secure method using software.
SV-87891r1_rule WN16-00-000110 CCI-000366 HIGH Systems must be maintained at a supported servicing level. 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.
SV-87893r2_rule WN16-00-000120 CCI-000366 HIGH The Windows Server 2016 system must use an anti-virus program. Malicious software can establish a base on individual desktops and servers. Employing an automated mechanism to detect this type of software will aid in elimination of the software from the operating system.
SV-87897r1_rule WN16-00-000140 CCI-000366 MEDIUM Servers must have a host-based intrusion detection or prevention system. A properly configured Host-based Intrusion Detection System (HIDS) or Host-based Intrusion Prevention System (HIPS) provides another level of defense against unauthorized access to critical servers. With proper configuration and logging enabled, such a system can stop and/or alert for many attempts to gain unauthorized access to resources.
SV-87899r1_rule WN16-00-000150 CCI-000213 HIGH Local volumes must use a format that supports NTFS attributes. 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.
SV-87901r1_rule WN16-00-000160 CCI-002165 MEDIUM Permissions for the system drive root directory (usually C:\) must conform to minimum requirements. Changing the system's file and directory permissions allows the possibility of unauthorized and anonymous modification to the operating system and installed applications. The default permissions are adequate when the Security Option "Network access: Let everyone permissions apply to anonymous users" is set to "Disabled" (WN16-SO-000290). Satisfies: SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123, SRG-OS-000312-GPOS-00124
SV-87903r1_rule WN16-00-000170 CCI-002165 MEDIUM Permissions for program file directories must conform to minimum requirements. Changing the system's file and directory permissions allows the possibility of unauthorized and anonymous modification to the operating system and installed applications. The default permissions are adequate when the Security Option "Network access: Let everyone permissions apply to anonymous users" is set to "Disabled" (WN16-SO-000290). Satisfies: SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123, SRG-OS-000312-GPOS-00124
SV-87905r1_rule WN16-00-000180 CCI-002165 MEDIUM Permissions for the Windows installation directory must conform to minimum requirements. Changing the system's file and directory permissions allows the possibility of unauthorized and anonymous modification to the operating system and installed applications. The default permissions are adequate when the Security Option "Network access: Let everyone permissions apply to anonymous users" is set to "Disabled" (WN16-SO-000290). Satisfies: SRG-OS-000312-GPOS-00122, SRG-OS-000312-GPOS-00123, SRG-OS-000312-GPOS-00124
SV-87907r1_rule WN16-00-000190 CCI-002235 MEDIUM Default permissions for the HKEY_LOCAL_MACHINE registry hive must be maintained. The registry is integral to the function, security, and stability of the Windows system. Changing the system's registry permissions allows the possibility of unauthorized and anonymous modification to the operating system.
SV-87909r1_rule WN16-00-000200 CCI-000213 LOW Non-administrative accounts or groups must only have print permissions on printer shares. Windows shares are a means by which files, folders, printers, and other resources can be published for network users to access. Improper configuration can permit access to devices and data beyond a user's need.
SV-87911r2_rule WN16-00-000210 CCI-000764 MEDIUM Outdated or unused accounts must be removed from the system or disabled. Outdated or unused accounts provide penetration points that may go undetected. Inactive accounts must be deleted if no longer necessary or, if still required, disabled until needed. Satisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000118-GPOS-00060
SV-87913r3_rule WN16-00-000220 CCI-000764 MEDIUM Accounts must require passwords. The lack of password protection enables anyone to gain access to the information system, which opens a backdoor opportunity for intruders to compromise the system as well as other resources. Accounts on a system must require passwords.
SV-87915r2_rule WN16-00-000230 CCI-000199 MEDIUM Passwords must be configured to expire. Passwords that do not expire or are reused increase the exposure of a password with greater probability of being discovered or cracked.
SV-87917r1_rule WN16-00-000240 CCI-001744 MEDIUM System files must be monitored for unauthorized changes. Monitoring system files for changes against a baseline on a regular basis may help detect the possible introduction of malicious code on a system.
SV-87919r1_rule WN16-00-000250 CCI-001090 MEDIUM Non-system-created file shares on a system must limit access to groups that require it. Shares on a system provide network access. To prevent exposing sensitive information, where shares are necessary, permissions must be reconfigured to give the minimum access to accounts that require it.
SV-87923r1_rule WN16-00-000270 CCI-000366 MEDIUM Software certificate installation files must be removed from Windows Server 2016. 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.
SV-87925r1_rule WN16-00-000280 CCI-001199 MEDIUM Systems requiring data at rest protections must employ cryptographic mechanisms to prevent unauthorized disclosure and modification of the information at rest. This requirement addresses protection of user-generated data as well as operating system-specific configuration data. Organizations may choose to employ different mechanisms to achieve confidentiality and integrity protections, as appropriate, in accordance with the security category and/or classification of the information. Selection of a cryptographic mechanism is based on the need to protect the integrity of organizational information. The strength of the mechanism is commensurate with the security category and/or classification of the information. Organizations have the flexibility to either encrypt all information on storage devices (i.e., full disk encryption) or encrypt specific data structures (e.g., files, records, or fields). Satisfies: SRG-OS-000185-GPOS-00079, SRG-OS-000404-GPOS-00183, SRG-OS-000405-GPOS-00184
SV-87927r1_rule WN16-00-000290 CCI-002420 MEDIUM Protection methods such as TLS, encrypted VPNs, or IPsec must be implemented if the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. Information can be either unintentionally or maliciously disclosed or modified during preparation for transmission, for example, during aggregation, at protocol transformation points, and during packing/unpacking. These unauthorized disclosures or modifications compromise the confidentiality or integrity of the information. Ensuring the confidentiality of transmitted information requires the operating system to take measures in preparing information for transmission. This can be accomplished via access control and encryption. Use of this requirement will be limited to situations where the data owner has a strict requirement for ensuring data integrity and confidentiality is maintained at every step of the data transfer and handling process. When transmitting data, operating systems need to support transmission protection mechanisms such as TLS, encrypted VPNs, or IPsec. Satisfies: SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190
SV-87929r1_rule WN16-00-000300 CCI-000381 MEDIUM The roles and features required by the system must be documented. Unnecessary roles and features increase the attack surface of a system. Limiting roles and features of a system to only those necessary reduces this potential. The standard installation option (previously called Server Core) further reduces this when selected at installation.
SV-87931r1_rule WN16-00-000310 CCI-000366 MEDIUM A host-based firewall must be installed and enabled on the system. A firewall provides a line of defense against attack, allowing or blocking inbound and outbound connections based on a set of rules.
SV-87933r1_rule WN16-00-000320 CCI-001233 MEDIUM Windows Server 2016 must employ automated mechanisms to determine the state of system components with regard to flaw remediation using the following frequency: continuously, where Host Based Security System (HBSS) is used; 30 days, for any additional internal network scans not covered by HBSS; and annually, for external scans by Computer Network Defense Service Provider (CNDSP). Without the use of automated mechanisms to scan for security flaws on a continuous and/or periodic basis, the operating system or other system components may remain vulnerable to the exploits presented by undetected software flaws. The operating system may have an integrated solution incorporating continuous scanning using HBSS and periodic scanning using other tools.
SV-87935r1_rule WN16-00-000330 CCI-000016 MEDIUM Windows Server 2016 must automatically remove or disable temporary user accounts after 72 hours. If temporary user accounts remain active when no longer needed or for an excessive period, these accounts may be used to gain unauthorized access. To mitigate this risk, automated termination of all temporary accounts must be set upon account creation. Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts without the demand for immediacy in account activation. If temporary accounts are used, the operating system must be configured to automatically terminate these types of accounts after a DoD-defined time period of 72 hours. To address access requirements, many operating systems may be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.
SV-87937r1_rule WN16-00-000340 CCI-001682 MEDIUM Windows Server 2016 must automatically remove or disable emergency accounts after the crisis is resolved or within 72 hours. Emergency administrator accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. Therefore, emergency account activation may bypass normal account authorization processes. If these accounts are automatically disabled, system maintenance during emergencies may not be possible, thus adversely affecting system availability. Emergency administrator accounts are different from infrequently used accounts (i.e., local logon accounts used by system administrators when network or normal logon/access is not available). Infrequently used accounts are not subject to automatic termination dates. Emergency accounts are accounts created in response to crisis situations, usually for use by maintenance personnel. The automatic expiration or disabling time period may be extended as needed until the crisis is resolved; however, it must not be extended indefinitely. A permanent account should be established for privileged users who need long-term maintenance accounts. To address access requirements, many operating systems can be integrated with enterprise-level authentication/access mechanisms that meet or exceed access control policy requirements.
SV-87939r1_rule WN16-00-000350 CCI-000381 MEDIUM The Fax Server role must not be installed. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
SV-87941r1_rule WN16-00-000360 CCI-000382 MEDIUM The Microsoft FTP service must not be installed unless required. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption.
SV-87943r1_rule WN16-00-000370 CCI-000381 MEDIUM The Peer Name Resolution Protocol must not be installed. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
SV-87945r1_rule WN16-00-000380 CCI-000381 MEDIUM Simple TCP/IP Services must not be installed. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
SV-87947r1_rule WN16-00-000390 CCI-000382 MEDIUM The Telnet Client must not be installed. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
SV-87949r1_rule WN16-00-000400 CCI-000381 MEDIUM The TFTP Client must not be installed. Unnecessary services increase the attack surface of a system. Some of these services may not support required levels of authentication or encryption or may provide unauthorized access to the system.
SV-87951r2_rule WN16-00-000410 CCI-000381 MEDIUM The Server Message Block (SMB) v1 protocol must be uninstalled. 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.
SV-87953r1_rule WN16-00-000420 CCI-000381 MEDIUM Windows PowerShell 2.0 must not be installed. Windows PowerShell 5.0 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 5.0 script block logging feature.
SV-87955r1_rule WN16-00-000430 CCI-000366 MEDIUM FTP servers must be configured to prevent anonymous logons. The FTP service allows remote users to access shared files and directories. Allowing anonymous FTP connections makes user auditing difficult. Using accounts that have administrator privileges to log on to FTP risks that the userid and password will be captured on the network and give administrator access to an unauthorized user.
SV-87957r1_rule WN16-00-000440 CCI-000366 MEDIUM FTP servers must be configured to prevent access to the system drive. The FTP service allows remote users to access shared files and directories that could provide access to system resources and compromise the system, especially if the user can gain access to the root directory of the boot drive.
SV-87959r1_rule WN16-00-000450 CCI-001891 LOW The time service must synchronize with an appropriate DoD time source. The Windows Time Service controls time synchronization settings. Time synchronization is essential for authentication and auditing purposes. If the Windows Time Service is used, it must synchronize with a secure, authorized time source. Domain-joined systems are automatically configured to synchronize with domain controllers. If an NTP server is configured, it must synchronize with a secure, authorized time source.
SV-87961r3_rule WN16-AC-000010 CCI-002238 MEDIUM Windows 2016 account lockout duration must be configured to 15 minutes or greater. 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.
SV-87963r2_rule WN16-AC-000020 CCI-000044 MEDIUM Windows Server 2016 must have the number of allowed bad logon attempts configured to three or less. 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.
SV-87965r2_rule WN16-AC-000030 CCI-000044 MEDIUM Windows Server 2016 must have the period of time before the bad logon counter is reset configured to 15 minutes or greater. 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
SV-87967r2_rule WN16-AC-000040 CCI-000200 MEDIUM Windows Server 2016 password history must be configured to 24 passwords remembered. 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.
SV-87969r2_rule WN16-AC-000050 CCI-000199 MEDIUM Windows Server 2016 maximum password age must be configured to 60 days or less. 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.
SV-87971r2_rule WN16-AC-000060 CCI-000198 MEDIUM Windows Server 2016 minimum password age must be configured to at least one day. 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.
SV-87973r2_rule WN16-AC-000070 CCI-000205 MEDIUM Windows Server 2016 minimum password length must be configured to 14 characters. 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.
SV-87975r2_rule WN16-AC-000080 CCI-000192 MEDIUM Windows Server 2016 must have the built-in Windows password complexity policy enabled. 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, upper- and lower-case 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
SV-87977r2_rule WN16-AC-000090 CCI-000196 HIGH Windows Server 2016 reversible password encryption must be disabled. 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.
SV-88011r1_rule WN16-DC-000020 CCI-001941 MEDIUM Kerberos user logon restrictions must be enforced. This policy setting determines whether the Kerberos Key Distribution Center (KDC) validates every request for a session ticket against the user rights policy of the target computer. The policy is 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
SV-88013r1_rule WN16-DC-000030 CCI-001941 MEDIUM The Kerberos service ticket maximum lifetime must be limited to 600 minutes or less. This setting determines the maximum amount of time (in minutes) that a granted session ticket can be used to access a particular service. Session tickets are used only to authenticate new 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
SV-88015r1_rule WN16-DC-000040 CCI-001941 MEDIUM The Kerberos user ticket lifetime must be limited to 10 hours or less. In Kerberos, there are two types of tickets: Ticket Granting Tickets (TGTs) and Service Tickets. Kerberos tickets have a limited lifetime so the time an attacker has to implement an attack is 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
SV-88017r1_rule WN16-DC-000050 CCI-001941 MEDIUM The Kerberos policy user ticket renewal maximum lifetime must be limited to seven days or less. This setting determines the period of time (in days) during which a user's 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
SV-88019r1_rule WN16-DC-000060 CCI-001941 MEDIUM The computer clock synchronization tolerance must be limited to 5 minutes or less. This setting determines the maximum time difference (in minutes) that Kerberos will tolerate between the time on a client's clock and the time on a server's clock while still considering the two 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
SV-88021r1_rule WN16-DC-000070 CCI-002235 HIGH Permissions on the Active Directory data files must only allow System and Administrators access. Improper access permissions for directory data-related files could allow unauthorized users to read, modify, or delete directory data or audit trails.
SV-88023r1_rule WN16-DC-000080 CCI-002235 HIGH The Active Directory SYSVOL directory must have the proper access control permissions. Improper access permissions for directory data files could allow unauthorized users to read, modify, or delete directory data. The SYSVOL directory contains public files (to the domain) such as policies and logon scripts. Data in shared subdirectories are replicated to all domain controllers in a domain.
SV-88025r1_rule WN16-DC-000090 CCI-002235 HIGH Active Directory Group Policy objects must have proper access control permissions. When directory service database objects do not have appropriate access control permissions, it may be possible for malicious users to create, read, update, or delete the objects and degrade or destroy the integrity of the data. When the directory service is used for identification, authentication, or authorization functions, a compromise of the database objects could lead to a compromise of all systems relying on the directory service. For Active Directory (AD), the Group Policy objects require special attention. In a distributed administration model (i.e., help desk), Group Policy objects are more likely to have access permissions changed from the secure defaults. If inappropriate access permissions are defined for Group Policy objects, this could allow an intruder to change the security policy applied to all domain client computers (workstations and servers).
SV-88027r2_rule WN16-DC-000100 CCI-002235 HIGH The Active Directory Domain Controllers Organizational Unit (OU) object must have the proper access control permissions. When Active Directory objects do not have appropriate access control permissions, it may be possible for malicious users to create, read, update, or delete the objects and degrade or destroy the integrity of the data. When the directory service is used for identification, authentication, or authorization functions, a compromise of the database objects could lead to a compromise of all systems that rely on the directory service. The Domain Controllers OU object requires special attention as the Domain Controllers are central to the configuration and management of the domain. Inappropriate access permissions defined for the Domain Controllers OU could allow an intruder or unauthorized personnel to make changes that could lead to the compromise of the domain.
SV-88029r1_rule WN16-DC-000110 CCI-002235 HIGH Domain-created Active Directory Organizational Unit (OU) objects must have proper access control permissions. When directory service database objects do not have appropriate access control permissions, it may be possible for malicious users to create, read, update, or delete the objects and degrade or destroy the integrity of the data. When the directory service is used for identification, authentication, or authorization functions, a compromise of the database objects could lead to a compromise of all systems that rely on the directory service. For Active Directory, the OU objects require special attention. In a distributed administration model (i.e., help desk), OU objects are more likely to have access permissions changed from the secure defaults. If inappropriate access permissions are defined for OU objects, it could allow an intruder to add or delete users in the OU. This could result in unauthorized access to data or a denial of service to authorized users.
SV-88031r1_rule WN16-DC-000120 CCI-001090 MEDIUM Data files owned by users must be on a different logical partition from the directory server data files. When directory service data files, especially for directories used for identification, authentication, or authorization, reside on the same logical partition as user-owned files, the directory service data may be more vulnerable to unauthorized access or other availability compromises. Directory service and user-owned data files sharing a partition may be configured with less restrictive permissions in order to allow access to the user data. The directory service may be vulnerable to a denial of service attack when user-owned files on a common partition are expanded to an extent preventing the directory service from acquiring more space for directory or audit data.
SV-88033r1_rule WN16-DC-000130 CCI-000381 MEDIUM Domain controllers must run on a machine dedicated to that function. Executing application servers on the same host machine with a directory server may substantially weaken the security of the directory server. Web or database server applications usually require the addition of many programs and accounts, increasing the attack surface of the computer. Some applications require the addition of privileged accounts, providing potential sources of compromise. Some applications (such as Microsoft Exchange) may require the use of network ports or services conflicting with the directory server. In this case, non-standard ports might be selected, and this could interfere with intrusion detection or prevention services.
SV-88035r1_rule WN16-DC-000140 CCI-002450 MEDIUM Separate, NSA-approved (Type 1) cryptography must be used to protect the directory data in transit for directory service implementations at a classified confidentiality level when replication data traverses a network cleared to a lower level than the data. Directory data that is not appropriately encrypted is subject to compromise. Commercial-grade encryption does not provide adequate protection when the classification level of directory data in transit is higher than the level of the network.
SV-88037r1_rule WN16-DC-000150 CCI-000366 HIGH Directory data (outside the root DSE) of a non-public directory must be configured to prevent anonymous access. To the extent that anonymous access to directory data (outside the root DSE) is permitted, read access control of the data is effectively disabled. If other means of controlling access (such as network restrictions) are compromised, there may be nothing else to protect the confidentiality of sensitive directory data.
SV-88039r1_rule WN16-DC-000160 CCI-001133 LOW The directory service must be configured to terminate LDAP-based network connections to the directory server after 5 minutes of inactivity. The failure to terminate inactive network connections increases the risk of a successful attack on the directory server. The longer an established session is in progress, the more time an attacker has to hijack the session, implement a means to passively intercept data, or compromise any protections on client access. For example, if an attacker gains control of a client computer, an existing (already authenticated) session with the directory server could allow access to the directory. The lack of confidentiality protection in LDAP-based sessions increases exposure to this vulnerability.
SV-88041r2_rule WN16-DC-000170 CCI-000172 MEDIUM Active Directory Group Policy objects must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes Group Policy objects. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88043r1_rule WN16-DC-000180 CCI-000172 MEDIUM The Active Directory Domain object must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes the Domain object. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88045r1_rule WN16-DC-000190 CCI-000172 MEDIUM The Active Directory Infrastructure object must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes the Infrastructure object. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88047r1_rule WN16-DC-000200 CCI-000172 MEDIUM The Active Directory Domain Controllers Organizational Unit (OU) object must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes the Domain Controller OU object. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88049r1_rule WN16-DC-000210 CCI-000172 MEDIUM The Active Directory AdminSDHolder object must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes the AdminSDHolder object. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88051r1_rule WN16-DC-000220 CCI-000172 MEDIUM The Active Directory RID Manager$ object must be configured with proper audit settings. When inappropriate audit settings are configured for directory service database objects, it may be possible for a user or process to update the data without generating any tracking data. The impact of missing audit data is related to the type of object. A failure to capture audit data for objects used by identification, authentication, or authorization functions could degrade or eliminate the ability to track changes to access policy for systems or data. For Active Directory (AD), there are a number of critical object types in the domain naming context of the AD database for which auditing is essential. This includes the RID Manager$ object. Because changes to these objects can significantly impact access controls or the availability of systems, the absence of auditing data makes it impossible to identify the source of changes that impact the confidentiality, integrity, and availability of data and systems throughout an AD domain. The lack of proper auditing can result in insufficient forensic evidence needed to investigate an incident and prosecute the intruder. Satisfies: SRG-OS-000327-GPOS-00127, SRG-OS-000458-GPOS-00203, SRG-OS-000463-GPOS-00207, SRG-OS-000468-GPOS-00212
SV-88053r1_rule WN16-AU-000010 CCI-001851 MEDIUM Audit records must be backed up to a different system or media than the system being audited. Protection of log data includes assuring the log data is not accidentally lost or deleted. Audit information stored in one location is vulnerable to accidental or incidental deletion or alteration.
SV-88055r1_rule WN16-AU-000020 CCI-001851 MEDIUM Windows Server 2016 must, at a minimum, off-load audit records of interconnected systems in real time and off-load standalone systems weekly. Protection of log data includes assuring the log data is not accidentally lost or deleted. Audit information stored in one location is vulnerable to accidental or incidental deletion or alteration.
SV-88057r1_rule WN16-AU-000030 CCI-000162 MEDIUM Permissions for the Application event log must prevent access by non-privileged accounts. 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
SV-88059r1_rule WN16-AU-000040 CCI-000162 MEDIUM Permissions for the Security event log must prevent access by non-privileged accounts. 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
SV-88061r1_rule WN16-AU-000050 CCI-000162 MEDIUM Permissions for the System event log must prevent access by non-privileged accounts. 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
SV-88063r1_rule WN16-AU-000060 CCI-001494 MEDIUM Event Viewer must be protected from unauthorized modification and deletion. 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
SV-88065r1_rule WN16-AU-000070 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Account Logon - Credential Validation successes. 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.
SV-88067r1_rule WN16-AU-000080 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Account Logon - Credential Validation failures. 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.
SV-88069r1_rule WN16-DC-000230 CCI-000018 MEDIUM Windows Server 2016 must be configured to audit Account Management - Computer Account Management successes. 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. Computer Account Management records events such as creating, changing, deleting, renaming, disabling, or enabling computer 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
SV-88071r1_rule WN16-AU-000100 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Account Management - Other Account Management Events successes. 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
SV-88075r1_rule WN16-AU-000120 CCI-000018 MEDIUM Windows Server 2016 must be configured to audit Account Management - Security Group Management successes. 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
SV-88079r1_rule WN16-AU-000140 CCI-000018 MEDIUM Windows Server 2016 must be configured to audit Account Management - User Account Management successes. 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
SV-88081r1_rule WN16-AU-000150 CCI-000018 MEDIUM Windows Server 2016 must be configured to audit Account Management - User Account Management failures. 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
SV-88083r2_rule WN16-AU-000160 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Detailed Tracking - Plug and Play Events successes. 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. Plug and Play activity records events related to the successful connection of external devices.
SV-88085r1_rule WN16-AU-000170 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Detailed Tracking - Process Creation successes. 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
SV-88087r1_rule WN16-DC-000240 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit DS Access - Directory Service Access successes. 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
SV-88089r1_rule WN16-DC-000250 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit DS Access - Directory Service Access failures. 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
SV-88091r1_rule WN16-DC-000260 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit DS Access - Directory Service Changes successes. 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
SV-88093r1_rule WN16-DC-000270 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit DS Access - Directory Service Changes failures. 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
SV-88095r3_rule WN16-AU-000220 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Account Lockout successes. 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
SV-88097r3_rule WN16-AU-000230 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Account Lockout failures. 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
SV-88099r2_rule WN16-AU-000240 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Group Membership successes. 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 Group Membership records information related to the group membership of a user's logon token.
SV-88101r1_rule WN16-AU-000250 CCI-000067 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Logoff successes. 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-000032-GPOS-00013, SRG-OS-000470-GPOS-00214, SRG-OS-000472-GPOS-00217, SRG-OS-000473-GPOS-00218, SRG-OS-000475-GPOS-00220
SV-88103r1_rule WN16-AU-000260 CCI-000067 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Logon successes. 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
SV-88105r1_rule WN16-AU-000270 CCI-000067 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Logon failures. 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
SV-88107r1_rule WN16-AU-000280 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Logon/Logoff - Special Logon successes. 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
SV-88109r1_rule WN16-AU-000290 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Object Access - Removable Storage successes. 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. Removable Storage auditing under Object Access records events related to access attempts on file system objects on removable storage devices.
SV-88111r1_rule WN16-AU-000300 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Object Access - Removable Storage failures. 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. Removable Storage auditing under Object Access records events related to access attempts on file system objects on removable storage devices.
SV-88113r1_rule WN16-AU-000310 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Policy Change - Audit Policy Change successes. 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
SV-88115r1_rule WN16-AU-000320 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Policy Change - Audit Policy Change failures. 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
SV-88117r1_rule WN16-AU-000330 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Policy Change - Authentication Policy Change successes. 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
SV-88119r1_rule WN16-AU-000340 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Policy Change - Authorization Policy Change successes. 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
SV-88121r1_rule WN16-AU-000350 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Privilege Use - Sensitive Privilege Use successes. 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
SV-88123r1_rule WN16-AU-000360 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit Privilege Use - Sensitive Privilege Use failures. 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
SV-88125r1_rule WN16-AU-000370 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - IPsec Driver successes. 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
SV-88127r1_rule WN16-AU-000380 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - IPsec Driver failures. 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
SV-88129r3_rule WN16-AU-000390 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - Other System Events successes. 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
SV-88131r3_rule WN16-AU-000400 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - Other System Events failures. 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
SV-88133r1_rule WN16-AU-000410 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - Security State Change successes. 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
SV-88135r1_rule WN16-AU-000420 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - Security System Extension successes. 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
SV-88139r1_rule WN16-CC-000280 CCI-001084 MEDIUM Administrator accounts must not be enumerated during elevation. Enumeration of administrator accounts when elevating can provide part of the logon information to an unauthorized user. This setting configures the system to always require users to type in a username and password to elevate a running application.
SV-88141r1_rule WN16-AU-000440 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - System Integrity successes. 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
SV-88143r1_rule WN16-AU-000450 CCI-000172 MEDIUM Windows Server 2016 must be configured to audit System - System Integrity failures. 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
SV-88145r1_rule WN16-CC-000010 CCI-000381 MEDIUM The display of slide shows on the lock screen must be disabled. 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.
SV-88147r1_rule WN16-MS-000020 CCI-001084 MEDIUM Local administrator accounts must have their privileged token filtered to prevent elevated privileges from being used over the network on domain systems. 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.
SV-88149r1_rule WN16-CC-000030 CCI-000381 MEDIUM WDigest Authentication must be disabled. 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 10. This setting ensures this is enforced.
SV-88151r1_rule WN16-CC-000040 CCI-000366 LOW Internet Protocol version 6 (IPv6) source routing must be configured to the highest protection level to prevent IP source routing. Configuring the system to disable IPv6 source routing protects against spoofing.
SV-88153r1_rule WN16-CC-000050 CCI-000366 LOW Source routing must be configured to the highest protection level to prevent Internet Protocol (IP) source routing. Configuring the system to disable IP source routing protects against spoofing.
SV-88155r1_rule WN16-CC-000060 CCI-000366 LOW Windows Server 2016 must be configured to prevent Internet Control Message Protocol (ICMP) redirects from overriding Open Shortest Path First (OSPF)-generated routes. 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.
SV-88157r1_rule WN16-CC-000070 CCI-002385 LOW Windows Server 2016 must be configured to ignore NetBIOS name release requests except from WINS servers. 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.
SV-88159r1_rule WN16-CC-000080 CCI-000366 MEDIUM Insecure logons to an SMB server must be disabled. Insecure guest logons allow unauthenticated access to shared folders. Shared resources on a system must require authentication to establish proper access.
SV-88161r1_rule WN16-CC-000090 CCI-000366 MEDIUM Hardened UNC paths must be defined to require mutual authentication and integrity for at least the \\*\SYSVOL and \\*\NETLOGON shares. Additional security requirements are applied to Universal Naming Convention (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.
SV-88163r1_rule WN16-CC-000100 CCI-000135 MEDIUM Command line data must be included in process creation events. 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.
SV-88165r1_rule WN16-CC-000110 CCI-000366 LOW Virtualization-based security must be enabled with the platform security level configured to Secure Boot or Secure Boot with DMA Protection. Virtualization Based Security (VBS) provides the platform for the additional security features Credential Guard and virtualization-based protection of code integrity. Secure Boot is the minimum security level, with DMA protection providing additional memory protection. DMA Protection requires a CPU that supports input/output memory management unit (IOMMU).
SV-88167r3_rule WN16-MS-000120 CCI-000366 LOW Credential Guard must be running on domain-joined member servers. Credential Guard uses virtualization-based security to protect data that could be used in credential theft attacks if compromised. This authentication information, which was stored in the Local Security Authority (LSA) in previous versions of Windows, is isolated from the rest of operating system and can only be accessed by privileged system software.
SV-88169r1_rule WN16-CC-000130 CCI-000366 LOW Virtualization-based protection of code integrity must be enabled on domain-joined systems. Virtualization-based protection of code integrity enforces kernel mode memory protections as well as protecting Code Integrity validation paths. This isolates the processes from the rest of the operating system and can only be accessed by privileged system software.
SV-88173r1_rule WN16-CC-000140 CCI-000366 MEDIUM Early Launch Antimalware, Boot-Start Driver Initialization Policy must prevent boot drivers identified as bad. 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.
SV-88177r1_rule WN16-CC-000150 CCI-000366 MEDIUM Group Policy objects must be reprocessed even if they have not changed. 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.
SV-88179r1_rule WN16-CC-000160 CCI-000381 MEDIUM Downloading print driver packages over HTTP must be prevented. 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.
SV-88181r1_rule WN16-CC-000170 CCI-000381 MEDIUM Printing over HTTP must be prevented. 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.
SV-88185r1_rule WN16-CC-000180 CCI-000381 MEDIUM The network selection user interface (UI) must not be displayed on the logon screen. Enabling interaction with the network selection UI allows users to change connections to available networks without signing in to Windows.
SV-88187r1_rule WN16-MS-000030 CCI-000381 MEDIUM Local users on domain-joined computers must not be enumerated. The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel.
SV-88197r1_rule WN16-CC-000210 CCI-000366 MEDIUM Users must be prompted to authenticate when the system wakes from sleep (on battery). 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).
SV-88201r1_rule WN16-CC-000220 CCI-000366 MEDIUM Users must be prompted to authenticate when the system wakes from sleep (plugged in). 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).
SV-88203r1_rule WN16-MS-000040 CCI-001967 MEDIUM Unauthenticated Remote Procedure Call (RPC) clients must be restricted from connecting to the RPC server. 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.
SV-88207r1_rule WN16-CC-000240 CCI-000381 LOW The Application Compatibility Program Inventory must be prevented from collecting data and sending the information to Microsoft. 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.
SV-88209r1_rule WN16-CC-000250 CCI-001764 HIGH AutoPlay must be turned off for non-volume devices. 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.
SV-88211r1_rule WN16-CC-000260 CCI-001764 HIGH The default AutoRun behavior must be configured to prevent AutoRun commands. Allowing AutoRun commands to execute may introduce malicious code to a system. Configuring this setting prevents AutoRun commands from executing.
SV-88213r1_rule WN16-CC-000270 CCI-001764 HIGH AutoPlay must be disabled for all drives. 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.
SV-88215r1_rule WN16-CC-000290 CCI-000366 MEDIUM Windows Telemetry must be configured to Security or Basic. 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.
SV-88217r1_rule WN16-CC-000300 CCI-001849 MEDIUM The Application event log size must be configured to 32768 KB or greater. 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.
SV-88219r1_rule WN16-CC-000310 CCI-001849 MEDIUM The Security event log size must be configured to 196608 KB or greater. 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.
SV-88221r1_rule WN16-CC-000320 CCI-001849 MEDIUM The System event log size must be configured to 32768 KB or greater. 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.
SV-88223r1_rule WN16-CC-000330 CCI-000381 MEDIUM Windows SmartScreen must be enabled. Windows SmartScreen helps protect systems from programs downloaded from the internet that may be malicious. Enabling SmartScreen will warn users of potentially malicious programs.
SV-88225r1_rule WN16-CC-000340 CCI-002824 MEDIUM Explorer Data Execution Prevention must be enabled. 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.
SV-88227r1_rule WN16-CC-000350 CCI-000366 LOW Turning off File Explorer heap termination on corruption must be disabled. Legacy plug-in applications may continue to function when a File Explorer session has become corrupt. Disabling this feature will prevent this.
SV-88229r1_rule WN16-CC-000360 CCI-000366 MEDIUM File Explorer shell protocol must run in protected mode. 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.
SV-88231r1_rule WN16-CC-000370 CCI-002038 MEDIUM Passwords must not be saved in the Remote Desktop Client. 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
SV-88233r1_rule WN16-CC-000380 CCI-001090 MEDIUM Local drives must be prevented from sharing with Remote Desktop Session Hosts. 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.
SV-88235r1_rule WN16-CC-000390 CCI-002038 MEDIUM Remote Desktop Services must always prompt a client for passwords upon connection. 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
SV-88237r1_rule WN16-CC-000400 CCI-001453 MEDIUM The Remote Desktop Session Host must require secure Remote Procedure Call (RPC) communications. 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.
SV-88239r1_rule WN16-CC-000410 CCI-001453 MEDIUM Remote Desktop Services must be configured with the client connection encryption set to High Level. 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.
SV-88241r1_rule WN16-CC-000420 CCI-000366 MEDIUM Attachments must be prevented from being downloaded from RSS feeds. Attachments from RSS feeds may not be secure. This setting will prevent attachments from being downloaded from RSS feeds.
SV-88243r1_rule WN16-CC-000430 CCI-000381 MEDIUM Basic authentication for RSS feeds over HTTP must not be used. Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.
SV-88245r1_rule WN16-CC-000440 CCI-000381 MEDIUM Indexing of encrypted files must be turned off. Indexing of encrypted files may expose sensitive data. This setting prevents encrypted files from being indexed.
SV-88247r1_rule WN16-CC-000450 CCI-001812 MEDIUM Users must be prevented from changing installation options. Installation options for applications are typically controlled by administrators. This setting prevents users from changing installation options that may bypass security features.
SV-88249r1_rule WN16-CC-000460 CCI-001812 HIGH The Windows Installer Always install with elevated privileges option must be disabled. 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.
SV-88251r1_rule WN16-CC-000470 CCI-000366 MEDIUM Users must be notified if a web-based program attempts to install software. 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.
SV-88253r1_rule WN16-CC-000480 CCI-000366 MEDIUM Automatically signing in the last interactive user after a system-initiated restart must be disabled. 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.
SV-88255r1_rule WN16-CC-000490 CCI-000135 MEDIUM PowerShell script block logging must be enabled. 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.
SV-88257r1_rule WN16-CC-000500 CCI-000877 HIGH The Windows Remote Management (WinRM) client must not use Basic authentication. Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.
SV-88259r1_rule WN16-CC-000510 CCI-002890 MEDIUM The Windows Remote Management (WinRM) client must not allow unencrypted traffic. 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
SV-88261r1_rule WN16-CC-000520 CCI-000877 MEDIUM The Windows Remote Management (WinRM) client must not use Digest authentication. Digest authentication is not as strong as other options and may be subject to man-in-the-middle attacks. Disallowing Digest authentication will reduce this potential.
SV-88263r1_rule WN16-CC-000530 CCI-000877 HIGH The Windows Remote Management (WinRM) service must not use Basic authentication. Basic authentication uses plain-text passwords that could be used to compromise a system. Disabling Basic authentication will reduce this potential.
SV-88265r1_rule WN16-CC-000540 CCI-002890 MEDIUM The Windows Remote Management (WinRM) service must not allow unencrypted traffic. 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
SV-88267r1_rule WN16-CC-000550 CCI-002038 MEDIUM The Windows Remote Management (WinRM) service must not store RunAs credentials. 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
SV-88269r3_rule WN16-PK-000010 CCI-000185 MEDIUM The DoD Root CA certificates must be installed in the Trusted Root Store. To ensure secure DoD websites and DoD-signed code are properly validated, the system must trust the DoD Root Certificate Authorities (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
SV-88271r3_rule WN16-PK-000020 CCI-000185 MEDIUM The DoD Interoperability Root CA cross-certificates must be installed in the Untrusted Certificates Store on unclassified systems. 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
SV-88273r3_rule WN16-PK-000030 CCI-000185 MEDIUM The US DoD CCEB Interoperability Root CA cross-certificates must be installed in the Untrusted Certificates Store on unclassified systems. 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
SV-88275r1_rule WN16-DC-000280 CCI-000185 MEDIUM Domain controllers must have a PKI server certificate. Domain controllers are part of the chain of trust for PKI authentications. Without the appropriate certificate, the authenticity of the domain controller cannot be verified. Domain controllers must have a server certificate to establish authenticity as part of PKI authentications in the domain.
SV-88277r1_rule WN16-DC-000290 CCI-000185 HIGH Domain Controller PKI certificates must be issued by the DoD PKI or an approved External Certificate Authority (ECA). A PKI implementation depends on the practices established by the Certificate Authority (CA) to ensure the implementation is secure. Without proper practices, the certificates issued by a CA have limited value in authentication functions. The use of multiple CAs from separate PKI implementations results in interoperability issues. If servers and clients do not have a common set of root CA certificates, they are not able to authenticate each other.
SV-88279r2_rule WN16-DC-000300 CCI-000185 HIGH PKI certificates associated with user accounts must be issued by the DoD PKI or an approved External Certificate Authority (ECA). A PKI implementation depends on the practices established by the Certificate Authority (CA) to ensure the implementation is secure. Without proper practices, the certificates issued by a CA have limited value in authentication functions.
SV-88281r1_rule WN16-DC-000310 CCI-000765 MEDIUM Active Directory user accounts, including administrators, must be configured to require the use of a Common Access Card (CAC), Personal Identity Verification (PIV)-compliant hardware token, or Alternate Logon Token (ALT) for user authentication. Smart cards such as the CAC support a two-factor authentication technique. This provides a higher level of trust in the asserted identity than use of the username and password for authentication. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055, SRG-OS-000375-GPOS-00160
SV-88285r1_rule WN16-SO-000020 CCI-000366 HIGH Local accounts with blank passwords must be restricted to prevent access from the network. 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.
SV-88287r2_rule WN16-SO-000030 CCI-000366 MEDIUM Windows Server 2016 built-in administrator account must be renamed. 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.
SV-88289r2_rule WN16-SO-000040 CCI-000366 MEDIUM Windows Server 2016 built-in guest account must be renamed. 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.
SV-88291r1_rule WN16-SO-000050 CCI-000169 MEDIUM Audit policy using subcategories must be enabled. 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.
SV-88293r1_rule WN16-DC-000320 CCI-002418 MEDIUM Domain controllers must require LDAP access signing. 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
SV-88295r1_rule WN16-DC-000330 CCI-000366 MEDIUM Domain controllers must be configured to allow reset of machine account passwords. 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.
SV-88297r1_rule WN16-SO-000080 CCI-002418 MEDIUM The setting Domain member: Digitally encrypt or sign secure channel data (always) must be configured to Enabled. 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
SV-88299r1_rule WN16-SO-000090 CCI-002418 MEDIUM The setting Domain member: Digitally encrypt secure channel data (when possible) must be configured to enabled. 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
SV-88301r1_rule WN16-SO-000100 CCI-002418 MEDIUM The setting Domain member: Digitally sign secure channel data (when possible) must be configured to Enabled. 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
SV-88303r1_rule WN16-SO-000110 CCI-001967 MEDIUM The computer account password must not be prevented from being reset. 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.
SV-88305r1_rule WN16-SO-000120 CCI-000366 MEDIUM The maximum age for machine account passwords must be configured to 30 days or less. 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.
SV-88307r1_rule WN16-SO-000130 CCI-002418 MEDIUM Windows Server 2016 must be configured to require a strong session key. 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
SV-88309r2_rule WN16-SO-000140 CCI-000057 MEDIUM The machine inactivity limit must be set to 15 minutes, locking the system with the screen saver. 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.
SV-88311r2_rule WN16-SO-000150 CCI-000048 MEDIUM The required legal notice must be configured to display before console logon. 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
SV-88313r1_rule WN16-SO-000160 CCI-000048 LOW The Windows dialog box title for the legal banner must be configured with the appropriate text. 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
SV-88315r1_rule WN16-MS-000050 CCI-000366 MEDIUM Caching of logon credentials must be limited. 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.
SV-88317r1_rule WN16-SO-000190 CCI-002418 MEDIUM The setting Microsoft network client: Digitally sign communications (always) must be configured to Enabled. 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
SV-88319r1_rule WN16-SO-000200 CCI-002418 MEDIUM The setting Microsoft network client: Digitally sign communications (if server agrees) must be configured to Enabled. 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
SV-88321r1_rule WN16-SO-000210 CCI-000197 MEDIUM Unencrypted passwords must not be sent to third-party Server Message Block (SMB) servers. 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.
SV-88325r1_rule WN16-SO-000230 CCI-002418 MEDIUM The setting Microsoft network server: Digitally sign communications (always) must be configured to Enabled. 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
SV-88327r1_rule WN16-SO-000240 CCI-002418 MEDIUM The setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to Enabled. 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
SV-88329r2_rule WN16-SO-000250 CCI-000366 HIGH Anonymous SID/Name translation must not be allowed. Allowing anonymous SID/Name translation can provide sensitive information for accessing a system. Only authorized users must be able to perform such translations.
SV-88331r1_rule WN16-SO-000260 CCI-000366 HIGH Anonymous enumeration of Security Account Manager (SAM) accounts must not be allowed. 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.
SV-88333r1_rule WN16-SO-000270 CCI-001090 HIGH Anonymous enumeration of shares must not be allowed. 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.
SV-88337r1_rule WN16-SO-000290 CCI-000366 MEDIUM Windows Server 2016 must be configured to prevent anonymous users from having the same permissions as the Everyone group. 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.
SV-88339r1_rule WN16-SO-000300 CCI-001090 HIGH Anonymous access to Named Pipes and Shares must be restricted. 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.
SV-88341r2_rule WN16-MS-000310 CCI-002235 MEDIUM Remote calls to the Security Account Manager (SAM) must be restricted to Administrators. The Windows Security Account Manager (SAM) stores users' passwords. Restricting Remote Procedure Call (RPC) connections to the SAM to Administrators helps protect those credentials.
SV-88343r1_rule WN16-SO-000320 CCI-000366 MEDIUM Services using Local System that use Negotiate when reverting to NTLM authentication must use the computer identity instead of authenticating anonymously. 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.
SV-88345r1_rule WN16-SO-000330 CCI-000366 MEDIUM NTLM must be prevented from falling back to a Null session. NTLM sessions that are allowed to fall back to Null (unauthenticated) sessions may gain unauthorized access.
SV-88347r1_rule WN16-SO-000340 CCI-000366 MEDIUM PKU2U authentication using online identities must be prevented. 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.
SV-88349r2_rule WN16-SO-000350 CCI-000803 MEDIUM Kerberos encryption types must be configured to prevent the use of DES and RC4 encryption suites. Certain encryption types are no longer considered secure. The DES and RC4 encryption suites must not be used for Kerberos encryption. Note: Organizations with domain controllers running earlier 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.
SV-88351r1_rule WN16-SO-000360 CCI-000196 HIGH Windows Server 2016 must be configured to prevent the storage of the LAN Manager hash of passwords. 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.
SV-88355r1_rule WN16-SO-000380 CCI-000366 HIGH The LAN Manager authentication level must be set to send NTLMv2 response only and to refuse LM and NTLM. 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.
SV-88357r1_rule WN16-SO-000390 CCI-000366 MEDIUM Windows Server 2016 must be configured to at least negotiate signing for LDAP client signing. 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.
SV-88359r1_rule WN16-SO-000400 CCI-000366 MEDIUM Session security for NTLM SSP-based clients must be configured to require NTLMv2 session security and 128-bit encryption. 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.
SV-88361r1_rule WN16-SO-000410 CCI-000366 MEDIUM Session security for NTLM SSP-based servers must be configured to require NTLMv2 session security and 128-bit encryption. 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.
SV-88363r1_rule WN16-SO-000420 CCI-000186 MEDIUM Users must be required to enter a password to access private keys stored on the computer. 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.
SV-88365r1_rule WN16-SO-000430 CCI-000068 MEDIUM Windows Server 2016 must be configured to use FIPS-compliant algorithms for encryption, hashing, and signing. 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. Satisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000478-GPOS-00223
SV-88369r1_rule WN16-SO-000450 CCI-000366 LOW The default permissions of global system objects must be strengthened. 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.
SV-88371r1_rule WN16-SO-000460 CCI-002038 MEDIUM User Account Control approval mode for the built-in Administrator must be enabled. 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
SV-88373r1_rule WN16-SO-000470 CCI-001084 MEDIUM UIAccess applications must not be allowed to prompt for elevation without using the secure desktop. 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.
SV-88375r1_rule WN16-SO-000480 CCI-001084 MEDIUM User Account Control must, at a minimum, prompt administrators for consent on the secure desktop. 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.
SV-88377r1_rule WN16-SO-000490 CCI-002038 MEDIUM User Account Control must automatically deny standard user requests for elevation. 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
SV-88379r1_rule WN16-SO-000500 CCI-001084 MEDIUM User Account Control must be configured to detect application installations and prompt for elevation. 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.
SV-88381r1_rule WN16-SO-000510 CCI-001084 MEDIUM User Account Control must only elevate UIAccess applications that are installed in secure locations. User Account Control (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.
SV-88383r1_rule WN16-SO-000520 CCI-002038 MEDIUM User Account Control must run all administrators in Admin Approval Mode, enabling UAC. 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
SV-88385r1_rule WN16-SO-000530 CCI-001084 MEDIUM User Account Control must virtualize file and registry write failures to per-user locations. User Account Control (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.
SV-88391r1_rule WN16-UC-000030 CCI-000366 MEDIUM Zone information must be preserved when saving attachments. Attachments from outside sources may contain malicious code. Preserving zone of origin (Internet, intranet, local, restricted) information on file attachments allows Windows to determine risk.
SV-88393r2_rule WN16-UR-000010 CCI-002235 MEDIUM The Access Credential Manager as a trusted caller user right must not be assigned to any groups or accounts. 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.
SV-88395r2_rule WN16-DC-000340 CCI-000213 MEDIUM The 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. 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.
SV-88397r3_rule WN16-MS-000340 CCI-000213 MEDIUM The Access this computer from the network user right must only be assigned to the Administrators and Authenticated Users groups on member servers. 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.
SV-88399r2_rule WN16-UR-000030 CCI-002235 HIGH The Act as part of the operating system user right must not be assigned to any groups or accounts. 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.
SV-88401r2_rule WN16-DC-000350 CCI-002235 MEDIUM The Add workstations to domain user right must only be assigned to the Administrators group. 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.
SV-88403r2_rule WN16-UR-000050 CCI-000213 MEDIUM The Allow log on locally user right must only be assigned to the Administrators group. 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.
SV-88405r2_rule WN16-DC-000360 CCI-000213 MEDIUM The Allow log on through Remote Desktop Services user right must only be assigned to the Administrators group. 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.
SV-88407r2_rule WN16-UR-000070 CCI-002235 MEDIUM The Back up files and directories user right must only be assigned to the Administrators group. 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.
SV-88409r2_rule WN16-UR-000080 CCI-002235 MEDIUM The Create a pagefile user right must only be assigned to the Administrators group. 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.
SV-88411r2_rule WN16-UR-000090 CCI-002235 HIGH The Create a token object user right must not be assigned to any groups or accounts. 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.
SV-88413r2_rule WN16-UR-000100 CCI-002235 MEDIUM The Create global objects user right must only be assigned to Administrators, Service, Local Service, and Network Service. 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.
SV-88415r2_rule WN16-UR-000110 CCI-002235 MEDIUM The Create permanent shared objects user right must not be assigned to any groups or accounts. 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.
SV-88417r2_rule WN16-UR-000120 CCI-002235 MEDIUM The Create symbolic links user right must only be assigned to the Administrators group. 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.
SV-88419r2_rule WN16-UR-000130 CCI-002235 HIGH The Debug programs user right must only be assigned to the Administrators group. 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.
SV-88421r2_rule WN16-DC-000370 CCI-000213 MEDIUM The Deny access to this computer from the network user right on domain controllers must be configured to prevent unauthenticated access. 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.
SV-88423r3_rule WN16-MS-000370 CCI-000213 MEDIUM The Deny access to this computer from the network user right on member servers must be configured to prevent access from highly privileged domain accounts and local accounts on domain systems, and from unauthenticated access on all systems. 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.
SV-88425r2_rule WN16-DC-000380 CCI-000213 MEDIUM The Deny log on as a batch job user right on domain controllers must be configured to prevent unauthenticated access. 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.
SV-88427r2_rule WN16-MS-000380 CCI-000213 MEDIUM The Deny log on as a batch job user right on member servers must be configured to prevent access from highly privileged domain accounts on domain systems and from unauthenticated access on all systems. 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.
SV-88429r2_rule WN16-DC-000390 CCI-000213 MEDIUM The Deny log on as a service user right must be configured to include no accounts or groups (blank) on domain controllers. 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.
SV-88431r2_rule WN16-MS-000390 CCI-000213 MEDIUM The Deny log on as a service user right on member servers must be configured to prevent access from highly privileged domain accounts on domain systems. No other groups or accounts must be assigned this right. 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 DoS.
SV-88433r2_rule WN16-DC-000400 CCI-000213 MEDIUM The Deny log on locally user right on domain controllers must be configured to prevent unauthenticated access. 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.
SV-88435r3_rule WN16-MS-000400 CCI-000213 MEDIUM The Deny log on locally user right on member servers must be configured to prevent access from highly privileged domain accounts on domain systems and from unauthenticated access on all systems. 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.
SV-88437r2_rule WN16-DC-000410 CCI-002314 MEDIUM The Deny log on through Remote Desktop Services user right on domain controllers must be configured to prevent unauthenticated access. 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.
SV-88439r3_rule WN16-MS-000410 CCI-002314 MEDIUM The Deny log on through Remote Desktop Services user right on member servers must be configured to prevent access from highly privileged domain accounts and all local accounts on domain systems and from unauthenticated access on all systems. 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.
SV-88441r2_rule WN16-DC-000420 CCI-002235 MEDIUM The Enable computer and user accounts to be trusted for delegation user right must only be assigned to the Administrators group on domain controllers. 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.
SV-88443r2_rule WN16-MS-000420 CCI-002235 MEDIUM The Enable computer and user accounts to be trusted for delegation user right must not be assigned to any groups or accounts on member servers. 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.
SV-88445r2_rule WN16-UR-000200 CCI-002235 MEDIUM The Force shutdown from a remote system user right must only be assigned to the Administrators group. 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.
SV-88447r2_rule WN16-UR-000210 CCI-002235 MEDIUM The Generate security audits user right must only be assigned to Local Service and Network Service. 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.
SV-88449r2_rule WN16-UR-000220 CCI-002235 MEDIUM The Impersonate a client after authentication user right must only be assigned to Administrators, Service, Local Service, and Network Service. 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.
SV-88451r2_rule WN16-UR-000230 CCI-002235 MEDIUM The Increase scheduling priority user right must only be assigned to the Administrators group. 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.
SV-88453r2_rule WN16-UR-000240 CCI-002235 MEDIUM The Load and unload device drivers user right must only be assigned to the Administrators group. 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.
SV-88455r2_rule WN16-UR-000250 CCI-002235 MEDIUM The Lock pages in memory user right must not be assigned to any groups or accounts. 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.
SV-88457r2_rule WN16-UR-000260 CCI-000162 MEDIUM The Manage auditing and security log user right must only be assigned to the Administrators group. 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
SV-88459r2_rule WN16-UR-000270 CCI-002235 MEDIUM The Modify firmware environment values user right must only be assigned to the Administrators group. 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.
SV-88461r2_rule WN16-UR-000280 CCI-002235 MEDIUM The Perform volume maintenance tasks user right must only be assigned to the Administrators group. 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.
SV-88463r2_rule WN16-UR-000290 CCI-002235 MEDIUM The Profile single process user right must only be assigned to the Administrators group. 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.
SV-88465r2_rule WN16-UR-000300 CCI-002235 MEDIUM The Restore files and directories user right must only be assigned to the Administrators group. 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.
SV-88467r2_rule WN16-UR-000310 CCI-002235 MEDIUM The Take ownership of files or other objects user right must only be assigned to the Administrators group. 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.
SV-88473r1_rule WN16-SO-000180 CCI-000366 MEDIUM The Smart Card removal option must be configured to Force Logoff or Lock Workstation. 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.
SV-88475r2_rule WN16-SO-000010 CCI-000804 MEDIUM Windows Server 2016 built-in guest account must be disabled. A system faces an increased vulnerability threat if the built-in guest account is not disabled. This is a known account that exists on all Windows systems and cannot be deleted. This account is initialized during the installation of the operating system with no password assigned.
SV-92829r1_rule WN16-00-000411 CCI-000381 MEDIUM The Server Message Block (SMB) v1 protocol must be disabled on the SMB server. 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.
SV-92831r1_rule WN16-00-000412 CCI-000381 MEDIUM The Server Message Block (SMB) v1 protocol must be disabled on the SMB client. 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.
SV-92833r2_rule WN16-00-000460 CCI-000366 MEDIUM Orphaned security identifiers (SIDs) must be removed from user rights on Windows 2016. Accounts or groups given rights on a system may show up as unresolved SIDs for various reasons including deletion of the accounts or groups. If the account or group objects are reanimated, there is a potential they may still have rights no longer intended. Valid domain accounts or groups may also show up as unresolved SIDs if a connection to the domain cannot be established for some reason.
SV-101005r1_rule WN16-00-000470 CCI-000366 LOW Secure Boot is a standard that ensures systems boot only to a trusted operating system. Secure Boot is required to support additional security features in Windows 10, including Virtualization Based Security and Credential Guard. If Secure Boot is turned off, these security features will not function.
SV-101007r1_rule WN16-00-000480 CCI-000366 LOW Windows 2016 systems must have Unified Extensible Firmware Interface (UEFI) firmware and be configured to run in UEFI mode, not Legacy BIOS. UEFI provides additional security features in comparison to legacy BIOS firmware, including Secure Boot. UEFI is required to support additional security features in Windows 10, including Virtualization Based Security and Credential Guard. Systems with UEFI that are operating in "Legacy BIOS" mode will not support these security features.
SV-101009r1_rule WN16-AU-000285 CCI-000172 MEDIUM Windows 2016 must be configured to audit Object Access - Other Object Access Events successes. 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.
SV-101011r1_rule WN16-AU-000286 CCI-000172 MEDIUM Windows 2016 must be configured to audit Object Access - Other Object Access Events failures. 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.
SV-101881r1_rule WN16-DC-000430 CCI-000366 MEDIUM The password for the krbtgt account on a domain must be reset at least every 180 days. The krbtgt account acts as a service account for the Kerberos Key Distribution Center (KDC) service. The account and password are created when a domain is created and the password is typically not changed. If the krbtgt account is compromised, attackers can create valid Kerberos Ticket Granting Tickets (TGT). The password must be changed twice to effectively remove the password history. Changing once, waiting for replication to complete and changing again reduces the risk of issues. Changing twice in rapid succession forces clients to re-authenticate (including application services) but is desired if a compromise is suspected.