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CIS SUSE Linux Enterprise 15 Benchmark for Level 1 - Server

Rules and Groups employed by this XCCDF Profile

  • Uninstall DHCP Client Package

    If the system does not need to act as a DHCP client, the dhcp-client package can be uninstalled. The <code>dhcp-client</code> package can be removed with the following command: <pre> $ sudo zypper ...
    Rule Medium Severity
    Show

  • 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 need to act as a DHCP server, it should be disabled...
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  • Uninstall DHCP Server Package

    If the system does not need to act as a DHCP server, the dhcp package can be uninstalled. The <code>dhcp-server</code> package can be removed with the following command: <pre> $ sudo zypper remove...
    Rule Medium Severity
    Show

  • Disable DHCP Service

    The <code>dhcpd</code> service should be disabled on any system that does not need to act as a DHCP server. The <code>dhcpd</code> service can be disabled with the following command: <pre>$ sudo s...
    Rule Medium Severity
    Show

  • DNS Server

    Most organizations have an operational need to run at least one nameserver. However, there are many common attacks involving DNS server software, and this server software should be disabled on any ...
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  • 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 SUSE Linux Enterprise 15 by default. The remainder ...
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  • Uninstall bind Package

    The named service is provided by the bind package. The bind package can be removed with the following command: 
    $ sudo zypper remove bind
    Rule Low Severity
    Show

  • Disable named Service

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

  • FTP Server

    FTP is a common method for allowing remote access to files. Like telnet, the FTP protocol is unencrypted, which means that passwords and other data transmitted during the session can be captured an...
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  • 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 zypper remove vsftpd
    Rule High Severity
    Show

  • Disable vsftpd Service

    The vsftpd service can be disabled with the following command: 
    $ sudo systemctl mask --now vsftpd.service
    Rule Medium 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> <br> <ul> <li>The HTTP port is commo...
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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
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  • Uninstall httpd Package

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

  • Disable httpd Service

    The httpd service can be disabled with the following command: 
    $ sudo systemctl mask --now httpd.service
    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.dovecot.org</a> contains more detailed information abou...
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  • 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 zypper remove dovecot
    Rule Unknown Severity
    Show

  • Disable Dovecot Service

    The dovecot service can be disabled with the following command: 
    $ sudo systemctl mask --now dovecot.service
    Rule Unknown Severity
    Show

  • LDAP

    LDAP is a popular directory service, that is, a standardized way of looking up information from a central database. SUSE Linux Enterprise 15 includes software that enables a system to act as both a...
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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 configuration files. SUSE Linux Enterprise 15 provid...
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  • 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>openldap2-client</code> package can be removed wit...
    Rule Low Severity
    Show

  • Configure OpenLDAP Server

    This section details some security-relevant settings for an OpenLDAP server.
    Group
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  • Uninstall openldap-servers Package

    The openldap2 package is not installed by default on a SUSE Linux Enterprise 15 system. It is needed only by the OpenLDAP server, not by the clients which use LDAP for authentication. If the system...
    Rule Low 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 targets of network attack. Ensure that systems are not r...
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  • Configure SMTP For Mail Clients

    This section discusses settings for Postfix in a submission-only e-mail configuration.
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  • 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 = <xccdf-1.2:sub idref="xccdf_org.ssgproject.conten...
    Rule Medium Severity
    Show

  • 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 circumstances under which it is possible to disable NF...
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  • Uninstall nfs-utils Package

    The nfs-utils package can be removed with the following command: 
    $ sudo zypper remove 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 subsystems required by NFS.
    Group
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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, and many listen for network connections. I...
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  • Uninstall rpcbind Package

    The rpcbind utility maps RPC services to the ports on which they listen. RPC processes notify rpcbind when they start, registering the ports they are listening on and the RPC program numbers they e...
    Rule Low Severity
    Show

  • 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 are listening on and the RPC program numbers they e...
    Rule Low Severity
    Show

  • Configure NFS Clients

    The steps in this section are appropriate for systems which operate as NFS clients.
    Group
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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 designated as NFS servers. Ensure that these daemons...
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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 not designated as a NFS server then this service ...
    Rule Unknown Severity
    Show

  • 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 unpredictably on unmanaged systems. Central time protocols can...
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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 set of servers and having all systems synchronize th...
    Rule Medium 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 systems and use a source that is highly accurate. M...
    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 use a source that is highly accurate. More informati...
    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 severely limiting the service has been the best a...
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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 following command: <pre> $ sudo zypper remove rsync</p...
    Rule Medium Severity
    Show

  • Ensure rsyncd service is disabled

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

  • 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 controls and perform some logging. It has been large...
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  • Uninstall tcpd Package

    The tcpd package can be removed with the following command: 
    $ sudo zypper remove tcpd
    Rule Low Severity
    Show

  • Uninstall xinetd Package

    The xinetd package can be removed with the following command: 
    $ sudo zypper remove xinetd
    Rule Low Severity
    Show

  • Disable xinetd Service

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

  • NIS

    The Network Information Service (NIS), also known as 'Yellow Pages' (YP), and its successor NIS+ have been made obsolete by Kerberos, LDAP, and other modern centralized authentication services. NIS...
    Group
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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 configuration files. The NIS client (<code>ypbind</cod...
    Rule Unknown Severity
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