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Guide to the Secure Configuration of SUSE Linux Enterprise 15

Rules, Groups, and Values defined within the XCCDF Benchmark

  • DHCP

    The Dynamic Host Configuration Protocol (DHCP) allows systems to request and obtain an IP address and other configuration parameters from a server....
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  • Configure DHCP Client if Necessary

    If DHCP must be used, then certain configuration changes can minimize the amount of information it receives and applies from the network, and thus ...
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  • Minimize the DHCP-Configured Options

    Create the file <code>/etc/dhcp/dhclient.conf</code>, and add an appropriate setting for each of the ten configuration settings which can be obtain...
    Rule Unknown Severity
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  • Configure DHCP Server

    If the system must act as a DHCP server, the configuration information it serves should be minimized. Also, support for other protocols and DNS-upd...
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  • Minimize Served Information

    Edit /etc/dhcp/dhcpd.conf. Examine each address range section within the file, and ensure that the following options are not defined unless there i...
    Rule Unknown Severity
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  • Disable DHCP Client

    DHCP is the default network configuration method provided by the system installer, and common on many networks. Nevertheless, manual management of ...
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  • 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 remove...
    Rule Medium Severity
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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...
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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...
    Rule Medium Severity
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  • 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 ...
    Rule Medium Severity
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  • DNS Server

    Most organizations have an operational need to run at least one nameserver. However, there are many common attacks involving DNS server software, a...
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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 S...
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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
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  • Disable named Service

    The named service can be disabled with the following command: 
    $ sudo systemctl mask --now named.service
    Rule Medium Severity
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  • Isolate DNS from Other Services

    This section discusses mechanisms for preventing the DNS server from interfering with other services. This is done both to protect the remainder of...
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  • Run DNS Software in a chroot Jail

    Install the <code>bind-chroot</code> package: <pre>$ sudo yum install bind-chroot</pre> Place a valid named.conf file inside the chroot jail: <pre>...
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  • Run DNS Software on Dedicated Servers

    Since DNS is a high-risk service which must frequently be made available to the entire Internet, it is strongly recommended that no other services ...
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  • Protect DNS Data from Tampering or Attack

    This section discusses DNS configuration options which make it more difficult for attackers to gain access to private DNS data or to modify DNS data.
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  • Use Views to Partition External and Internal Information

    If it is not possible to run external and internal nameservers on separate physical systems, run BIND9 and simulate this feature using views. Edit ...
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  • Run Separate DNS Servers for External and Internal Queries

    Is it possible to run external and internal nameservers on separate systems? If so, follow the configuration guidance in this section. On the exter...
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