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Guide to the Secure Configuration of Oracle Linux 8

Rules, Groups, and Values defined within the XCCDF Benchmark

  • NFS and RPC

    The Network File System is a popular distributed filesystem for the Unix environment, and is very widely deployed. This section discusses the circ...
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  • Uninstall nfs-utils Package

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

  • Disable All NFS Services if Possible

    If there is not a reason for the system to operate as either an NFS client or an NFS server, follow all instructions in this section to disable sub...
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  • Disable netfs if Possible

    To determine if any network filesystems handled by netfs are currently mounted on the system execute the following command: <pre>$ mount -t nfs,nfs...
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  • Disable Network File Systems (netfs)

    The netfs script manages the boot-time mounting of several types of networked filesystems, of which NFS and Samba are the most common. If these fil...
    Rule Unknown Severity
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  • Disable Services Used Only by NFS

    If NFS is not needed, disable the NFS client daemons nfslock, rpcgssd, and rpcidmapd. <br><br> All of these daemons run with elevated privileges, a...
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  • Disable rpcbind Service

    The rpcbind utility maps RPC services to the ports on which they listen. RPC processes notify rpcbind when they start, registering the ports they a...
    Rule Low Severity
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  • Configure All Systems which Use NFS

    The steps in this section are appropriate for all systems which run NFS, whether they operate as clients or as servers.
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  • Configure NFS Services to Use Fixed Ports (NFSv3 and NFSv2)

    Firewalling should be done at each host and at the border firewalls to protect the NFS daemons from remote access, since NFS servers should never b...
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  • Configure NFS Clients

    The steps in this section are appropriate for systems which operate as NFS clients.
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  • Disable NFS Server Daemons

    There is no need to run the NFS server daemons <code>nfs</code> and <code>rpcsvcgssd</code> except on a small number of properly secured systems de...
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  • Mount Remote Filesystems with Restrictive Options

    Edit the file <code>/etc/fstab</code>. For each filesystem whose type (column 3) is <code>nfs</code> or <code>nfs4</code>, add the text <code>,node...
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  • Mount Remote Filesystems with Kerberos Security

    Add the <code>sec=krb5:krb5i:krb5p</code> option to the fourth column of <code>/etc/fstab</code> for the line which controls mounting of any NFS mo...
    Rule Medium Severity
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  • Mount Remote Filesystems with nodev

    Add the nodev option to the fourth column of /etc/fstab for the line which controls mounting of any NFS mounts.
    Rule Medium Severity
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  • Mount Remote Filesystems with noexec

    Add the noexec option to the fourth column of /etc/fstab for the line which controls mounting of any NFS mounts.
    Rule Medium Severity
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  • Mount Remote Filesystems with nosuid

    Add the nosuid option to the fourth column of /etc/fstab for the line which controls mounting of any NFS mounts.
    Rule Medium Severity
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  • Configure NFS Servers

    The steps in this section are appropriate for systems which operate as NFS servers.
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  • Ensure All-Squashing Disabled On All Exports

    The <code>all_squash</code> maps all uids and gids to an anonymous user. This should be disabled by removing any instances of the <code>all_squash<...
    Rule Low Severity
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  • Use Kerberos Security on All Exports

    Using Kerberos on all exported mounts prevents a malicious client or user from impersonating a system user. To cryptography authenticate users to t...
    Rule Medium Severity
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  • Configure the Exports File Restrictively

    Linux's NFS implementation uses the file <code>/etc/exports</code> to control what filesystems and directories may be accessed via NFS. (See the <c...
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  • Export Filesystems Read-Only if Possible

    If a filesystem is being exported so that users can view the files in a convenient fashion, but there is no need for users to edit those files, exp...
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  • Use Access Lists to Enforce Authorization Restrictions

    When configuring NFS exports, ensure that each export line in <code>/etc/exports</code> contains a list of hosts which are allowed to access that e...
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  • 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 unpredictabl...
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  • Vendor Approved Time pools

    The list of vendor-approved pool servers
    Value
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  • Vendor Approved Time Servers

    The list of vendor-approved time servers
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  • Maximum NTP or Chrony Poll

    The maximum NTP or Chrony poll interval number in seconds specified as a power of two.
    Value
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  • 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 se...
    Rule Medium Severity
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  • Install the ntp service

    The ntpd service should be installed.
    Rule High Severity
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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 t...
    Rule Medium Severity
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  • Disable ypbind Service

    The <code>ypbind</code> service, which allows the system to act as a client in a NIS or NIS+ domain, should be disabled. The <code>ypbind</code> s...
    Rule Medium Severity
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  • Rlogin, Rsh, and Rexec

    The Berkeley r-commands are legacy services which allow cleartext remote access and have an insecure trust model.
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  • Enable the NTP Daemon

    The ntpd service can be enabled with the following command: 
    $ sudo systemctl enable ntpd.service
    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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  • Disable network management of chrony daemon

    The <code>cmdport</code> option in <code>/etc/chrony.conf</code> can be set to <code>0</code> to stop chrony daemon from listening on the UDP port ...
    Rule Low Severity
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  • Configure Time Service Maxpoll Interval

    The <code>maxpoll</code> should be configured to <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_time_service_set_maxpoll" use="legacy...
    Rule Medium Severity
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  • Specify Additional Remote NTP Servers

    Depending on specific functional requirements of a concrete production environment, the Oracle Linux 8 system can be configured to utilize the serv...
    Rule Medium Severity
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  • Remove NIS Client

    The Network Information Service (NIS), formerly known as Yellow Pages, is a client-server directory service protocol used to distribute system conf...
    Rule Unknown Severity
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  • Specify a Remote NTP Server

    Depending on specific functional requirements of a concrete production environment, the Oracle Linux 8 system can be configured to utilize the serv...
    Rule Medium Severity
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  • Ensure Chrony is only configured with the server directive

    Check that Chrony only has time sources configured with the server directive.
    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
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  • Specify Additional Remote NTP Servers

    Additional NTP servers can be specified for time synchronization in the file <code>/etc/ntp.conf</code>. To do so, add additional lines of the fol...
    Rule Unknown Severity
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  • Specify a Remote NTP Server

    To specify a remote NTP server for time synchronization, edit the file <code>/etc/ntp.conf</code>. Add or correct the following lines, substituting...
    Rule Medium Severity
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  • Obsolete Services

    This section discusses a number of network-visible services which have historically caused problems for system security, and for which disabling or...
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  • Ensure rsyncd service is disabled

    The rsyncd service can be disabled with the following command: 
    $ sudo systemctl mask --now rsyncd.service
    Rule Medium Severity
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  • Xinetd

    The <code>xinetd</code> service acts as a dedicated listener for some network services (mostly, obsolete ones) and can be used to provide access co...
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  • Uninstall xinetd Package

    The xinetd package can be removed with the following command: 
    $ sudo yum erase xinetd
    Rule Low Severity
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  • Disable xinetd Service

    The xinetd service can be disabled with the following command: 
    $ sudo systemctl mask --now xinetd.service
    Rule Medium Severity
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  • NIS

    The Network Information Service (NIS), also known as 'Yellow Pages' (YP), and its successor NIS+ have been made obsolete by Kerberos, LDAP, and oth...
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  • Uninstall rsh-server Package

    The rsh-server package can be removed with the following command: 
    $ sudo yum erase rsh-server
    Rule High Severity
    Show

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