DRAFT - Unclassified Information in Non-federal Information Systems and Organizations (NIST 800-171)
Rules and Groups employed by this XCCDF Profile
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Disable acquiring, saving, and processing core dumps
Thesystemd-coredump.socketunit is a socket activation of thesystemd-coredump@.servicewhich processes core dumps. By masking the unit, core dump processing is disabled.Rule Medium Severity -
Enable ExecShield
ExecShield describes kernel features that provide protection against exploitation of memory corruption errors such as buffer overflows. These features include random placement of the stack and othe...Group -
Restrict Exposed Kernel Pointer Addresses Access
To set the runtime status of the <code>kernel.kptr_restrict</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.kptr_restrict=<xccdf-1.2:sub idref="xccdf_org.ssgproject...Rule Medium Severity -
SELinux
SELinux is a feature of the Linux kernel which can be used to guard against misconfigured or compromised programs. SELinux enforces the idea that programs should be limited in what files they can a...Group -
Configure SELinux Policy
The SELinux <code>targeted</code> policy is appropriate for general-purpose desktops and servers, as well as systems in many other roles. To configure the system to use this policy, add or correct ...Rule Medium Severity -
Ensure SELinux State is Enforcing
The SELinux state should be set to <code><xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_selinux_state" use="legacy"></xccdf-1.2:sub></code> at system boot time. In the file <code>/et...Rule High Severity -
Services
The best protection against vulnerable software is running less software. This section describes how to review the software which Red Hat Enterprise Linux 9 installs on a system and disable softwar...Group -
Base Services
This section addresses the base services that are installed on a Red Hat Enterprise Linux 9 default installation which are not covered in other sections. Some of these services listen on the networ...Group -
Disable KDump Kernel Crash Analyzer (kdump)
The <code>kdump</code> service provides a kernel crash dump analyzer. It uses the <code>kexec</code> system call to boot a secondary kernel ("capture" kernel) following a system crash, which can lo...Rule Medium Severity -
Application Whitelisting Daemon
Fapolicyd (File Access Policy Daemon) implements application whitelisting to decide file access rights. Applications that are known via a reputation source are allowed access while unknown applicat...Group -
Install fapolicyd Package
Thefapolicydpackage can be installed with the following command:$ sudo dnf install fapolicyd
Rule Medium Severity -
Enable the File Access Policy Service
The File Access Policy service should be enabled. Thefapolicydservice can be enabled with the following command:$ sudo systemctl enable fapolicyd.service
Rule Medium Severity -
Network Time Protocol
The Network Time Protocol is used to manage the system clock over a network. Computer clocks are not very accurate, so time will drift unpredictably on unmanaged systems. Central time protocols can...Group -
The Chrony package is installed
System time should be synchronized between all systems in an environment. This is typically done by establishing an authoritative time server or set of servers and having all systems synchronize th...Rule Medium Severity -
Disable chrony daemon from acting as server
The <code>port</code> option in <code>/etc/chrony.conf</code> can be set to <code>0</code> to make chrony daemon to never open any listening port for server operation and to operate strictly in a c...Rule Low Severity -
SSH Server
The SSH protocol is recommended for remote login and remote file transfer. SSH provides confidentiality and integrity for data exchanged between two systems, as well as server authentication, throu...Group -
Install OpenSSH client software
Theopenssh-clientspackage can be installed with the following command:$ sudo dnf install openssh-clients
Rule Medium Severity -
Install the OpenSSH Server Package
The <code>openssh-server</code> package should be installed. The <code>openssh-server</code> package can be installed with the following command: <pre> $ sudo dnf install openssh-server</pre> ...Rule Medium Severity -
Configure OpenSSH Client if Necessary
The following configuration changes apply to the SSH client. They can improve security parameters relwevant to the client user, e.g. increasing entropy while generating initialization vectors. Note...Group -
Configure session renegotiation for SSH client
The <code>RekeyLimit</code> parameter specifies how often the session key is renegotiated, both in terms of amount of data that may be transmitted and the time elapsed. To decrease the default limi...Rule Medium Severity -
Configure OpenSSH Server if Necessary
If the system needs to act as an SSH server, then certain changes should be made to the OpenSSH daemon configuration file <code>/etc/ssh/sshd_config</code>. The following recommendations can be app...Group -
Disable Host-Based Authentication
SSH's cryptographic host-based authentication is more secure than <code>.rhosts</code> authentication. However, it is not recommended that hosts unilaterally trust one another, even within an organ...Rule Medium Severity -
Disable SSH Access via Empty Passwords
Disallow SSH login with empty passwords. The default SSH configuration disables logins with empty passwords. The appropriate configuration is used if no value is set for <code>PermitEmptyPasswords<...Rule High Severity -
Disable GSSAPI Authentication
Unless needed, SSH should not permit extraneous or unnecessary authentication mechanisms like GSSAPI. <br> The default SSH configuration disallows authentications based on GSSAPI. The appropriate c...Rule Medium Severity -
Disable Kerberos Authentication
Unless needed, SSH should not permit extraneous or unnecessary authentication mechanisms like Kerberos. <br> The default SSH configuration disallows authentication validation through Kerberos. The ...Rule Medium Severity -
Disable SSH Root Login
The root user should never be allowed to login to a system directly over a network. To disable root login via SSH, add or correct the following line in <code>/etc/ssh/sshd_config.d/00-compliancea...Rule Medium Severity -
Enable SSH Warning Banner
To enable the warning banner and ensure it is consistent across the system, add or correct the following line in <code>/etc/ssh/sshd_config.d/00-complianceascode-hardening.conf</code>: <pre>Bann...Rule Medium Severity -
Force frequent session key renegotiation
The <code>RekeyLimit</code> parameter specifies how often the session key of the is renegotiated, both in terms of amount of data that may be transmitted and the time elapsed.<br> To decrease the d...Rule Medium Severity -
Distribute the SSH Server configuration to multiple files in a config directory.
Make sure to have the <code>Include /etc/ssh/sshd_config.d/*.conf</code> line in the <code>/etc/ssh/sshd_config</code> file. Ideally, don't have any active configuration directives in that file, an...Rule Medium Severity -
USBGuard daemon
The USBGuard daemon enforces the USB device authorization policy for all USB devices.Group -
Install usbguard Package
Theusbguardpackage can be installed with the following command:$ sudo dnf install usbguard
Rule Medium Severity -
Enable the USBGuard Service
The USBGuard service should be enabled. Theusbguardservice can be enabled with the following command:$ sudo systemctl enable usbguard.service
Rule Medium Severity -
Log USBGuard daemon audit events using Linux Audit
To configure USBGuard daemon to log via Linux Audit (as opposed directly to a file), <code>AuditBackend</code> option in <code>/etc/usbguard/usbguard-daemon.conf</code> needs to be set to <code>Lin...Rule Low Severity -
Authorize Human Interface Devices and USB hubs in USBGuard daemon
To allow authorization of USB devices combining human interface device and hub capabilities by USBGuard daemon, add the line <code>allow with-interface match-all { 03:*:* 09:00:* }</code> to <code>...Rule Medium Severity
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