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Guide to the Secure Configuration of Oracle Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Remote Authentication Dial-In User Service (RADIUS)

    Remote Authentication Dial-In User Service (RADIUS) is a networking protocol, operating on port 1812 that provides centralized Authentication, Auth...
    Group
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  • Hardware RNG Entropy Gatherer Daemon

    The rngd feeds random data from hardware device to kernel random device.
    Group
    Show

  • Enable the Hardware RNG Entropy Gatherer Service

    The Hardware RNG Entropy Gatherer service should be enabled. The <code>rngd</code> service can be enabled with the following command: <pre>$ sudo ...
    Rule Low Severity
    Show

  • Network Routing

    A router is a very desirable target for a potential adversary because they fulfill a variety of infrastructure networking roles such as access to ...
    Group
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  • Disable Quagga if Possible

    If Quagga was installed and activated, but the system does not need to act as a router, then it should be disabled and removed.
    Group
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  • Uninstall quagga Package

    The quagga package can be removed with the following command: 
     $ sudo yum erase quagga
    Rule Low Severity
    Show

  • Samba(SMB) Microsoft Windows File Sharing Server

    When properly configured, the Samba service allows Linux systems to provide file and print sharing to Microsoft Windows systems. There are two soft...
    Group
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  • SSH Max authentication attempts

    Specify the maximum number of authentication attempts per connection.
    Value
    Show

  • Configure Samba if Necessary

    All settings for the Samba daemon can be found in <code>/etc/samba/smb.conf</code>. Settings are divided between a <code>[global]</code> configurat...
    Group
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  • Restrict Printer Sharing

    By default, Samba utilizes the CUPS printing service to enable printer sharing with Microsoft Windows workstations. If there are no printers on the...
    Group
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  • Restrict SMB File Sharing to Configured Networks

    Only users with local user accounts will be able to log in to Samba shares by default. Shares can be limited to particular users or network address...
    Group
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  • Disable Samba if Possible

    Even after the Samba server package has been installed, it will remain disabled. Do not enable this service unless it is absolutely necessary to pr...
    Group
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  • SNMP Server

    The Simple Network Management Protocol allows administrators to monitor the state of network devices, including computers. Older versions of SNMP w...
    Group
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  • Disable SNMP Server if Possible

    The system includes an SNMP daemon that allows for its remote monitoring, though it not installed by default. If it was installed and activated but...
    Group
    Show

  • Configure SNMP Server if Necessary

    If it is necessary to run the snmpd agent on the system, some best practices should be followed to minimize the security risk from the installation...
    Group
    Show

  • SNMP read-only community string

    Specify the SNMP community string used for read-only access.
    Value
    Show

  • SNMP read-write community string

    Specify the SNMP community string used for read-write access.
    Value
    Show

  • SSH Server

    The SSH protocol is recommended for remote login and remote file transfer. SSH provides confidentiality and integrity for data exchanged between tw...
    Group
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  • SSH enabled firewalld zone

    Specify firewalld zone to enable SSH service. This value is used only for remediation purposes.
    Value
    Show

  • SSH Approved ciphers by FIPS

    Specify the FIPS approved ciphers that are used for data integrity protection by the SSH server.
    Value
    Show

  • SSH Approved MACs by FIPS

    Specify the FIPS approved MACs (message authentication code) algorithms that are used for data integrity protection by the SSH server.
    Value
    Show

  • SSH is required to be installed

    Specify if the Policy requires SSH to be installed. Used by SSH Rules to determine if SSH should be uninstalled or configured.<br> A value of 0 mea...
    Value
    Show

  • SSH Strong KEX by FIPS

    Specify the FIPS approved KEXs (Key Exchange Algorithms) algorithms that are used for methods in cryptography by which cryptographic keys are exch...
    Value
    Show

  • SSH Max Sessions Count

    Specify the maximum number of open sessions permitted.
    Value
    Show

  • SSH Max Keep Alive Count

    Specify the maximum number of idle message counts before session is terminated.
    Value
    Show

  • Install OpenSSH client software

    The openssh-clients package can be installed with the following command: 
    $ sudo yum install openssh-clients
    Rule Medium Severity
    Show

  • 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: <...
    Rule Medium Severity
    Show

  • Remove the OpenSSH Server Package

    The <code>openssh-server</code> package should be removed. The <code>openssh-server</code> package can be removed with the following command: <pre>...
    Rule Medium Severity
    Show

  • Enable the OpenSSH Service

    The SSH server service, sshd, is commonly needed. The <code>sshd</code> service can be enabled with the following command: <pre>$ sudo systemctl e...
    Rule Medium Severity
    Show

  • Disable SSH Server If Possible

    The SSH server service, sshd, is commonly needed. However, if it can be disabled, do so. This is unusual, as SSH is a common method for encrypted ...
    Rule High Severity
    Show

  • Verify Group Who Owns SSH Server config file

    To properly set the group owner of /etc/ssh/sshd_config, run the command: 
    $ sudo chgrp root /etc/ssh/sshd_config
    Rule Medium Severity
    Show

  • Verify Group Ownership on SSH Server Private *_key Key Files

    SSH server private keys, files that match the /etc/ssh/*_key glob, must be group-owned by ssh_keys group.
    Rule Medium Severity
    Show

  • Verify Group Ownership on SSH Server Public *.pub Key Files

    SSH server public keys, files that match the /etc/ssh/*.pub glob, must be group-owned by root group.
    Rule Medium Severity
    Show

  • Verify Owner on SSH Server config file

    To properly set the owner of /etc/ssh/sshd_config, run the command: 
    $ sudo chown root /etc/ssh/sshd_config
    Rule Medium Severity
    Show

  • Verify Ownership on SSH Server Private *_key Key Files

    SSH server private keys, files that match the /etc/ssh/*_key glob, must be owned by root user.
    Rule Medium Severity
    Show

  • Verify Ownership on SSH Server Public *.pub Key Files

    SSH server public keys, files that match the /etc/ssh/*.pub glob, must be owned by root user.
    Rule Medium Severity
    Show

  • Verify Permissions on SSH Server config file

    To properly set the permissions of /etc/ssh/sshd_config, run the command: 
    $ sudo chmod 0600 /etc/ssh/sshd_config
    Rule Medium Severity
    Show

  • Verify Permissions on SSH Server Private *_key Key Files

    SSH server private keys - files that match the <code>/etc/ssh/*_key</code> glob, have to have restricted permissions. If those files are owned by t...
    Rule Medium Severity
    Show

  • Verify Permissions on SSH Server Public *.pub Key Files

    To properly set the permissions of /etc/ssh/*.pub, run the command: 
    $ sudo chmod 0644 /etc/ssh/*.pub
    Rule Medium Severity
    Show

  • Remove SSH Server iptables Firewall exception (Unusual)

    By default, inbound connections to SSH's port are allowed. If the SSH server is not being used, this exception should be removed from the firewall ...
    Rule Unknown Severity
    Show

  • 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 ent...
    Group
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  • 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 ...
    Rule Medium Severity
    Show

  • Verify the SSH Private Key Files Have a Passcode

    When creating SSH key pairs, always use a passcode. <br> You can create such keys with the following command: <pre>$ sudo ssh-keygen -n [passphrase...
    Rule Medium Severity
    Show

  • 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_confi...
    Group
    Show

  • SSH RekeyLimit - size

    Specify the size component of the rekey limit.
    Value
    Show

  • SSH RekeyLimit - size

    Specify the size component of the rekey limit.
    Value
    Show

  • SSH Compression Setting

    Specify the compression setting for SSH connections.
    Value
    Show

  • SSH Privilege Separation Setting

    Specify whether and how sshd separates privileges when handling incoming network connections.
    Value
    Show

  • SSH LoginGraceTime setting

    Configure parameters for how long the servers stays connected before the user has successfully logged in
    Value
    Show

  • SSH MaxStartups setting

    Configure parameters for maximum concurrent unauthenticated connections to the SSH daemon.
    Value
    Show

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