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Guide to the Secure Configuration of Red Hat Enterprise Linux 7

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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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  • Configure Logging

    Ensure that the following line exists in <code>/etc/rsyslog.conf</code>: <pre>daemon.* /var/log/daemon.log</pre> Configure logwatch or ot...
    Rule Unknown Severity
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  • Deny BOOTP Queries

    Unless your network needs to support older BOOTP clients, disable support for the bootp protocol by adding or correcting the global option: <pre>de...
    Rule Unknown Severity
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  • Deny Decline Messages

    Edit <code>/etc/dhcp/dhcpd.conf</code> and add or correct the following global option to prevent the DHCP server from responding the DHCPDECLINE me...
    Rule Unknown Severity
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  • Do Not Use Dynamic DNS

    To prevent the DHCP server from receiving DNS information from clients, edit <code>/etc/dhcp/dhcpd.conf</code>, and add or correct the following gl...
    Rule Unknown Severity
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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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  • Disable DHCP Client in ifcfg

    For each interface on the system (e.g. eth0), edit <code>/etc/sysconfig/network-scripts/ifcfg-<i>interface</i></code> and make the following change...
    Rule Unknown 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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  • Disable Zone Transfers from the Nameserver

    Is it necessary for a secondary nameserver to receive zone data via zone transfer from the primary server? If not, follow the instructions in this...
    Rule Unknown 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 R...
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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.
    Group
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  • Authenticate Zone Transfers

    If it is necessary for a secondary nameserver to receive zone data via zone transfer from the primary server, follow the instructions here. Use dn...
    Rule Medium Severity
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