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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 Avahi if Necessary

    If your system requires the Avahi daemon, its configuration can be restricted to improve security. The Avahi daemon configuration file is <code>/et...
    Group
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  • Check Avahi Responses' TTL Field

    To make Avahi ignore packets unless the TTL field is 255, edit <code>/etc/avahi/avahi-daemon.conf</code> and ensure the following line appears in t...
    Rule Low Severity
    Show

  • Disable Avahi Publishing

    To prevent Avahi from publishing its records, edit <code>/etc/avahi/avahi-daemon.conf</code> and ensure the following line appears in the <code>[pu...
    Rule Low Severity
    Show

  • Serve Avahi Only via Required Protocol

    If you are using only IPv4, edit <code>/etc/avahi/avahi-daemon.conf</code> and ensure the following line exists in the <code>[server]</code> sectio...
    Rule Low Severity
    Show

  • Prevent Other Programs from Using Avahi's Port

    To prevent other mDNS stacks from running, edit <code>/etc/avahi/avahi-daemon.conf</code> and ensure the following line appears in the <code>[serve...
    Rule Medium Severity
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  • Restrict Information Published by Avahi

    If it is necessary to publish some information to the network, it should not be joined by any extraneous information, or by information supplied by...
    Rule Low Severity
    Show

  • Disable Avahi Server if Possible

    Because the Avahi daemon service keeps an open network port, it is subject to network attacks. Disabling it can reduce the system's vulnerability t...
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  • Uninstall avahi Server Package

    If the system does not need to have an Avahi server which implements the DNS Service Discovery and Multicast DNS protocols, the avahi-autoipd and a...
    Rule Medium Severity
    Show

  • Disable Avahi Server Software

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

  • Base Services

    This section addresses the base services that are installed on a Red Hat Enterprise Linux 7 default installation which are not covered in other sec...
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