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Guide to the Secure Configuration of SUSE Linux Enterprise 15

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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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  • Make Each System a Client or a Server, not Both

    If NFS must be used, it should be deployed in the simplest configuration possible to avoid maintainability problems which may lead to unnecessary s...
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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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  • Disable Network File System (nfs)

    The Network File System (NFS) service allows remote hosts to mount and interact with shared filesystems on the local system. If the local system is...
    Rule Unknown Severity
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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 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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  • 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
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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.
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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
    Show

  • 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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  • Print Support

    The Common Unix Printing System (CUPS) service provides both local and network printing support. A system running the CUPS service can accept print...
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  • Enable the NTP Daemon

    The ntp service can be enabled with the following command: 
    $ sudo systemctl enable ntp.service
    Rule High Severity
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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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  • Enable systemd_timesyncd Service

    The systemd_timesyncd service can be enabled with the following command: 
    $ sudo systemctl enable systemd_timesyncd.service
    Rule High Severity
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  • Chrony Configure Pool and Server

    <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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  • 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 SUSE Linux Enterprise 15 system can be configured to utiliz...
    Rule Medium Severity
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  • Ensure that chronyd is running under chrony user account

    chrony is a daemon which implements the Network Time Protocol (NTP). It is designed to synchronize system clocks across a variety of systems and us...
    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

  • 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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  • Uninstall rsync Package

    The rsyncd service can be used to synchronize files between systems over network links. The <code>rsync</code> package can be removed with the foll...
    Rule Medium Severity
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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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  • Install tcp_wrappers Package

    When network services are using the <code>xinetd</code> service, the <code>tcp_wrappers</code> package should be installed. The <code>tcp_wrappers<...
    Rule Medium Severity
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  • Uninstall tcpd Package

    The tcpd package can be removed with the following command: 
    $ sudo zypper remove tcpd
    Rule Low Severity
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  • Uninstall xinetd Package

    The xinetd package can be removed with the following command: 
    $ sudo zypper remove 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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  • Uninstall CUPS Package

    The cups package can be removed with the following command: 
    $ sudo zypper remove cups
    Rule Unknown Severity
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  • Disable the CUPS Service

    The cups service can be disabled with the following command: 
    $ sudo systemctl mask --now cups.service
    Rule Unknown Severity
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  • Ensure /etc/hosts.deny is configured

    The file <code>/etc/hosts.deny</code> together with <code>/etc/hosts.allow</code> provides a simple access control mechanism for network services s...
    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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  • 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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  • Uninstall ypserv Package

    The ypserv package can be removed with the following command: 
    $ sudo zypper remove ypserv
    Rule High 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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  • Uninstall rsh-server Package

    The rsh-server package can be removed with the following command: 
    $ sudo zypper remove rsh-server
    Rule High Severity
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  • Uninstall rsh Package

    The rsh package contains the client commands for the rsh services
    Rule Unknown Severity
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