Guide to the Secure Configuration of Red Hat Enterprise Linux 9
Rules, Groups, and Values defined within the XCCDF Benchmark
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System Settings
Contains rules that check correct system settings.Group -
Installing and Maintaining Software
The following sections contain information on security-relevant choices during the initial operating system installation process and the setup of s...Group -
Prefer to use a 64-bit Operating System when supported
Prefer installation of 64-bit operating systems when the CPU supports it.Rule Medium Severity -
System and Software Integrity
System and software integrity can be gained by installing antivirus, increasing system encryption strength with FIPS, verifying installed software,...Group -
Software Integrity Checking
Both the AIDE (Advanced Intrusion Detection Environment) software and the RPM package management system provide mechanisms for verifying the integr...Group -
Integrity Scan Notification Email Address
Specify the email address for designated personnel if baseline configurations are changed in an unauthorized manner.Value -
Verify Integrity with RPM
The RPM package management system includes the ability to verify the integrity of installed packages by comparing the installed files with informat...Group -
faildelay_delay
Delay next login attempt after a failed loginValue -
How to Use This Guide
Readers should heed the following points when using the guide.Group -
pwhistory_remember
Prevent password re-use using password history lookupValue -
Disable Dovecot
If the system does not need to operate as an IMAP or POP3 server, the dovecot software should be disabled and removed.Group -
Chat/Messaging Services
The talk software makes it possible for users to send and receive messages across systems through a terminal session.Group -
Verify and Correct Ownership with RPM
The RPM package management system can check file ownership permissions of installed software packages, including many that are important to system ...Rule High Severity -
Verify and Correct File Permissions with RPM
The RPM package management system can check file access permissions of installed software packages, including many that are important to system sec...Rule High Severity -
Verify Integrity with AIDE
AIDE conducts integrity checks by comparing information about files with previously-gathered information. Ideally, the AIDE database is created imm...Group -
Interactive users initialization files
'A regular expression describing a list of file names for files that are sourced at login time for interactive users'Value -
Install AIDE
Theaidepackage can be installed with the following command:$ sudo dnf install aide
Rule Medium Severity -
Build and Test AIDE Database
Run the following command to generate a new database: <pre>$ sudo /usr/sbin/aide --init</pre> By default, the database will be written to the fil...Rule Medium Severity -
Configure AIDE to Verify the Audit Tools
The operating system file integrity tool must be configured to protect the integrity of the audit tools.Rule Medium Severity -
Configure Periodic Execution of AIDE
At a minimum, AIDE should be configured to run a weekly scan. To implement a daily execution of AIDE at 4:05am using cron, add the following line t...Rule Medium Severity -
Configure Notification of Post-AIDE Scan Details
AIDE should notify appropriate personnel of the details of a scan after the scan has been run. If AIDE has already been configured for periodic exe...Rule Medium Severity -
Configure AIDE to Use FIPS 140-2 for Validating Hashes
By default, the <code>sha512</code> option is added to the <code>NORMAL</code> ruleset in AIDE. If using a custom ruleset or the <code>sha512</code...Rule Medium Severity -
Configure AIDE to Verify Access Control Lists (ACLs)
By default, the <code>acl</code> option is added to the <code>FIPSR</code> ruleset in AIDE. If using a custom ruleset or the <code>acl</code> optio...Rule Low Severity -
Ensure McAfee Endpoint Security for Linux (ENSL) is running
Install McAfee Endpoint Security for Linux antivirus software which is provided for DoD systems and uses signatures to search for the presence of v...Rule Medium Severity -
Configure AIDE to Verify Extended Attributes
By default, the <code>xattrs</code> option is added to the <code>FIPSR</code> ruleset in AIDE. If using a custom ruleset or the <code>xattrs</code>...Rule Low Severity -
Audit Tools Must Be Group-owned by Root
Red Hat Enterprise Linux 9 systems providing tools to interface with audit information will leverage user permissions and roles identifying the use...Rule Medium Severity -
Audit Tools Must Be Owned by Root
Red Hat Enterprise Linux 9 systems providing tools to interface with audit information will leverage user permissions and roles identifying the use...Rule Medium Severity -
Audit Tools Must Have a Mode of 0755 or Less Permissive
Red Hat Enterprise Linux 9 systems providing tools to interface with audit information will leverage user permissions and roles identifying the use...Rule Medium Severity -
Federal Information Processing Standard (FIPS)
The Federal Information Processing Standard (FIPS) is a computer security standard which is developed by the U.S. Government and industry working g...Group -
Enable Dracut FIPS Module
To enable FIPS mode, run the following command: <pre>fips-mode-setup --enable</pre> To enable FIPS, the system requires that the <code>fips</code> ...Rule High Severity -
Enable FIPS Mode
To enable FIPS mode, run the following command: <pre>fips-mode-setup --enable</pre> <br> The <code>fips-mode-setup</code> command will configure t...Rule High Severity -
Ensure '/etc/system-fips' exists
On a system where FIPS mode is enabled, <code>/etc/system-fips</code> must exist. To enable FIPS mode, run the following command: <pre>fips-mode-se...Rule High Severity -
McAfee Host-Based Intrusion Detection Software (HBSS)
McAfee Host-based Security System (HBSS) is a suite of software applications used to monitor, detect, and defend computer networks and systems.Group -
Set kernel parameter 'crypto.fips_enabled' to 1
System running in FIPS mode is indicated by kernel parameter <code>'crypto.fips_enabled'</code>. This parameter should be set to <code>1</code> in ...Rule High Severity -
System Cryptographic Policies
Linux has the capability to centrally configure cryptographic polices. The command <code>update-crypto-policies</code> is used to set the policy ap...Group -
SSH client RekeyLimit - size
Specify the size component of the rekey limit. This limit signifies amount of data. After this amount of data is transferred through the connection...Value -
SSH client RekeyLimit - time
Specify the time component of the rekey limit. The session key is renegotiated after the defined amount of time passes. The number is followed by u...Value -
The system-provided crypto policies
Specify the crypto policy for the system.Value -
Install crypto-policies package
Thecrypto-policiespackage can be installed with the following command:$ sudo dnf install crypto-policies
Rule Medium Severity -
Configure BIND to use System Crypto Policy
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. BIND is supported by crypto policy, but the BIND confi...Rule High Severity -
Configure System Cryptography Policy
To configure the system cryptography policy to use ciphers only from the <code><xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_system_...Rule High Severity -
Configure GnuTLS library to use DoD-approved TLS Encryption
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. GnuTLS is supported by system crypto policy, but the G...Rule Medium Severity -
Configure Kerberos to use System Crypto Policy
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. Kerberos is supported by crypto policy, but it's confi...Rule High Severity -
PAM pwhistory remember - control flag
'Specify the control flag required for password remember requirement. If multiple values are allowed write them separated by commas as in "required...Value -
Configure Libreswan to use System Crypto Policy
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. Libreswan is supported by system crypto policy, but th...Rule High Severity -
Configure OpenSSL library to use System Crypto Policy
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. OpenSSL is supported by crypto policy, but the OpenSSL...Rule Medium Severity -
Configure OpenSSL library to use TLS Encryption
Crypto Policies are means of enforcing certain cryptographic settings for selected applications including OpenSSL. OpenSSL is by default configured...Rule Medium Severity -
Configure SSH to use System Crypto Policy
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. SSH is supported by crypto policy, but the SSH configu...Rule Medium Severity -
Harden SSH client Crypto Policy
Crypto Policies are means of enforcing certain cryptographic settings for selected applications including OpenSSH client. To override the system wi...Rule Medium Severity -
Configure SSH Client to Use FIPS 140-2 Validated Ciphers: openssh.config
Crypto Policies provide a centralized control over crypto algorithms usage of many packages. OpenSSH is supported by system crypto policy, but the ...Rule High Severity
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