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Guide to the Secure Configuration of Red Hat Enterprise Linux 10

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Disable DNS Server

    DNS software should be disabled on any systems which does not need to be a nameserver. Note that the BIND DNS server software is not installed on R...
    Group
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  • Uninstall bind Package

    The <code>named</code> service is provided by the <code>bind</code> package. The <code>bind</code> package can be removed with the following comman...
    Rule Low Severity
    Show

  • Application Whitelisting Daemon

    Fapolicyd (File Access Policy Daemon) implements application whitelisting to decide file access rights. Applications that are known via a reputatio...
    Group
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  • Restrict at and cron to Authorized Users if Necessary

    The <code>/etc/cron.allow</code> and <code>/etc/at.allow</code> files contain lists of users who are allowed to use <code>cron</code> and at to del...
    Group
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  • Ensure that /etc/at.deny does not exist

    The file /etc/at.deny should not exist. Use /etc/at.allow instead.
    Rule Medium Severity
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  • Ensure that /etc/cron.allow exists

    The file /etc/cron.allow should exist and should be used instead of /etc/cron.deny.
    Rule Medium Severity
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  • Ensure that /etc/cron.deny does not exist

    The file /etc/cron.deny should not exist. Use /etc/cron.allow instead.
    Rule Medium Severity
    Show

  • Verify Group Who Owns /etc/at.allow file

    If <code>/etc/at.allow</code> exists, it must be group-owned by <code>root</code>. To properly set the group owner of <code>/etc/at.allow</code>, ...
    Rule Medium Severity
    Show

  • Verify Group Who Owns /etc/cron.allow file

    If <code>/etc/cron.allow</code> exists, it must be group-owned by <code>root</code>. To properly set the group owner of <code>/etc/cron.allow</cod...
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/at.allow file

    If <code>/etc/at.allow</code> exists, it must be owned by <code>root</code>. To properly set the owner of <code>/etc/at.allow</code>, run the comm...
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/cron.allow file

    If <code>/etc/cron.allow</code> exists, it must be owned by <code>root</code>. To properly set the owner of <code>/etc/cron.allow</code>, run the ...
    Rule Medium Severity
    Show

  • Verify Permissions on /etc/at.allow file

    If <code>/etc/at.allow</code> exists, it must have permissions <code>0600</code> or more restrictive. To properly set the permissions of <code>/e...
    Rule Medium Severity
    Show

  • Verify Permissions on /etc/cron.allow file

    If <code>/etc/cron.allow</code> exists, it must have permissions <code>0600</code> or more restrictive. To properly set the permissions of <code>...
    Rule Medium Severity
    Show

  • DHCP

    The Dynamic Host Configuration Protocol (DHCP) allows systems to request and obtain an IP address and other configuration parameters from a server....
    Group
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  • Disable DHCP Server

    The DHCP server <code>dhcpd</code> is not installed or activated by default. If the software was installed and activated, but the system does not n...
    Group
    Show

  • Ensure LDAP client is not installed

    The Lightweight Directory Access Protocol (LDAP) is a service that provides a method for looking up information from a central database. The <code>...
    Rule Low Severity
    Show

  • Remove ftp Package

    FTP (File Transfer Protocol) is a traditional and widely used standard tool for transferring files between a server and clients over a network, esp...
    Rule Low Severity
    Show

  • Disable vsftpd if Possible

    To minimize attack surface, disable vsftpd if at all possible.
    Group
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  • Uninstall vsftpd Package

    The vsftpd package can be removed with the following command: 
     $ sudo dnf remove vsftpd
    Rule High Severity
    Show

  • Web Server

    The web server is responsible for providing access to content via the HTTP protocol. Web servers represent a significant security risk because: <br...
    Group
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  • Disable Apache if Possible

    If Apache was installed and activated, but the system does not need to act as a web server, then it should be disabled and removed from the system.
    Group
    Show

  • Uninstall httpd Package

    The httpd package can be removed with the following command: 
    $ sudo dnf remove httpd
    Rule Unknown Severity
    Show

  • Disable NGINX if Possible

    If NGINX was installed and activated, but the system does not need to act as a web server, then it should be removed from the system.
    Group
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  • Uninstall nginx Package

    The nginx package can be removed with the following command: 
    $ sudo dnf remove nginx
    Rule Unknown Severity
    Show

  • IMAP and POP3 Server

    Dovecot provides IMAP and POP3 services. It is not installed by default. The project page at <a href="http://www.dovecot.org">http://www.dovec...
    Group
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  • Disable Cyrus IMAP

    If the system does not need to operate as an IMAP or POP3 server, the Cyrus IMAP software should be removed.
    Group
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  • Uninstall cyrus-imapd Package

    The cyrus-imapd package can be removed with the following command: 
    $ sudo dnf remove cyrus-imapd
    Rule Unknown Severity
    Show

  • 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
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  • Uninstall dovecot Package

    The dovecot package can be removed with the following command: 
    $ sudo dnf remove dovecot
    Rule Unknown Severity
    Show

  • Kerberos

    The Kerberos protocol is used for authentication across non-secure network. Authentication can happen between various types of principals -- users,...
    Group
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  • Disable Kerberos by removing host keytab

    Kerberos is not an approved key distribution method for Common Criteria. To prevent using Kerberos by system daemons, remove the Kerberos keytab fi...
    Rule Medium Severity
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  • LDAP

    LDAP is a popular directory service, that is, a standardized way of looking up information from a central database. Red Hat Enterprise Linux 10 inc...
    Group
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  • Configure OpenLDAP Clients

    This section provides information on which security settings are important to configure in OpenLDAP clients by manually editing the appropriate con...
    Group
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  • Enable the LDAP Client For Use in Authconfig

    To determine if LDAP is being used for authentication, use the following command: <pre>$ sudo grep -i useldapauth /etc/sysconfig/authconfig</pre> ...
    Rule Medium Severity
    Show

  • Mail Server Software

    Mail servers are used to send and receive email over the network. Mail is a very common service, and Mail Transfer Agents (MTAs) are obvious target...
    Group
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  • The s-nail Package Is Installed

    A mail server is required for sending emails. The <code>s-nail</code> package can be installed with the following command: <pre> $ sudo dnf install...
    Rule Medium Severity
    Show

  • Ensure Mail Transfer Agent is not Listening on any non-loopback Address

    Mail Transfer Agents (MTA), such as sendmail and Postfix, are used to listen for incoming mail and transfer the messages to the appropriate user or...
    Rule Medium Severity
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  • Configure SMTP For Mail Clients

    This section discusses settings for Postfix in a submission-only e-mail configuration.
    Group
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  • Postfix Network Interfaces

    The setting for inet_interfaces in /etc/postfix/main.cf
    Value
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  • Postfix Root Mail Alias

    Specify an email address (string) for a root mail alias.
    Value
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  • Configure System to Forward All Mail For The Root Account

    Make sure that mails delivered to root user are forwarded to a monitored email address. Make sure that the address <xccdf-1.2:sub idref="xccdf_org....
    Rule Medium Severity
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  • Configure System to Forward All Mail From Postmaster to The Root Account

    Verify the administrators are notified in the event of an audit processing failure. Check that the "/etc/aliases" file has a defined value for "roo...
    Rule Medium Severity
    Show

  • Disable Postfix Network Listening

    Edit the file <code>/etc/postfix/main.cf</code> to ensure that only the following <code>inet_interfaces</code> line appears: <pre>inet_interfaces =...
    Rule Medium Severity
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  • Configure Operating System to Protect Mail Server

    The guidance in this section is appropriate for any host which is operating as a site MTA, whether the mail server runs using Sendmail, Postfix, or...
    Group
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  • Configure Postfix if Necessary

    Postfix stores its configuration files in the directory /etc/postfix by default. The primary configuration file is /etc/postfix/main.cf.
    Group
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  • The Chronyd service is enabled

    chrony is a daemon which implements the Network Time Protocol (NTP) is designed to synchronize system clocks across a variety of systems and use a ...
    Rule Medium Severity
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  • Enable the NTP Daemon

    Run the following command to determine the current status of the <code>chronyd</code> service: <pre>$ sudo systemctl is-active chronyd</pre> If ...
    Rule Medium Severity
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  • A remote time server for Chrony is configured

    <code>Chrony</code> is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of s...
    Rule Medium Severity
    Show

  • Configure Time Service to use NTS

    The system should be configured to use time servers that support Network Time Security (NTS). The specified time server must support NTS and must b...
    Rule Medium Severity
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  • 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 f...
    Rule Low Severity
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