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Guide to the Secure Configuration of Ubuntu 18.04

Rules, Groups, and Values defined within the XCCDF Benchmark

  • net.ipv4.icmp_echo_ignore_broadcasts

    Ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast
    Value
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  • net.ipv4.icmp_ignore_bogus_error_responses

    Enable to prevent unnecessary logging
    Value
    Show

  • net.ipv4.tcp_invalid_ratelimit

    Configure the maximal rate for sending duplicate acknowledgments in response to incoming invalid TCP packets.
    Value
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  • net.ipv4.tcp_rfc1337

    Enable to enable TCP behavior conformant with RFC 1337
    Value
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  • net.ipv4.tcp_syncookies

    Enable to turn on TCP SYN Cookie Protection
    Value
    Show

  • Disable Accepting Packets Routed Between Local Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.accept_local</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net...
    Rule Medium Severity
    Show

  • Configure ARP filtering for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.arp_filter</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.i...
    Rule Medium Severity
    Show

  • Configure Response Mode of ARP Requests for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.arp_ignore</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.i...
    Rule Medium Severity
    Show

  • Prevent Routing External Traffic to Local Loopback on All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.route_localnet</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w n...
    Rule Medium Severity
    Show

  • Configure Sending and Accepting Shared Media Redirects for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.shared_media</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net...
    Rule Medium Severity
    Show

  • Configure Sending and Accepting Shared Media Redirects by Default

    To set the runtime status of the <code>net.ipv4.conf.default.shared_media</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w...
    Rule Medium Severity
    Show

  • Network Parameters for Hosts Only

    If the system is not going to be used as a router, then setting certain kernel parameters ensure that the host will not perform routing of network ...
    Group
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  • nftables

    <code>If firewalld or iptables are being used in your environment, please follow the guidance in their respective section and pass-over the guidanc...
    Group
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  • Nftables Base Chain Hooks

    The possible hooks which can be used to configure the base chain are: <code>ingress</code> (only in netdev family since Linux kernel 4.2, and inet ...
    Value
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  • Nftables Chain Names

    The rules in nftables are attached to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter pack...
    Value
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  • Nftables Base Chain Policies

    This is the default verdict that will be applied to packets reaching the end of the chain (i.e, no more rules to be evaluated against). Currently ...
    Value
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  • Nftables Base Chain Priorities

    Each nftables base chain is assigned a priority that defines its ordering among other base chains, flowtables, and Netfilter internal operations a...
    Value
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  • Nftables Base Chain Types

    Base chains are those that are registered into the Netfilter hooks, i.e. these chains see packets flowing through the Linux TCP/IP stack. The poss...
    Value
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  • Nftables Families

    Netfilter enables filtering at multiple networking levels. With iptables there is a separate tool for each level: iptables, ip6tables, arptables, ...
    Value
    Show

  • Nftables Master configuration file

    The file which contains top level configuration for nftables service, and with which, the service is started.
    Value
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  • Nftables Tables

    Tables in nftables hold chains. Each table only has one address family and only applies to packets of this family. Tables can have one of six fami...
    Value
    Show

  • SuSEfirewall2

    The SuSEfirewall2 provides a managed firewall.
    Group
    Show

  • Uncomplicated Firewall (ufw)

    The Linux kernel in Ubuntu provides a packet filtering system called netfilter, and the traditional interface for manipulating netfilter are the ip...
    Group
    Show

  • Verify ufw Enabled

    The ufw service can be enabled with the following command: 
    $ sudo systemctl enable ufw.service
    Rule Medium Severity
    Show

  • Uncommon Network Protocols

    The system includes support for several network protocols which are not commonly used. Although security vulnerabilities in kernel networking code ...
    Group
    Show

  • Disable RDS Support

    The Reliable Datagram Sockets (RDS) protocol is a transport layer protocol designed to provide reliable high-bandwidth, low-latency communications ...
    Rule Low Severity
    Show

  • Disable TIPC Support

    The Transparent Inter-Process Communication (TIPC) protocol is designed to provide communications between nodes in a cluster. To configure the sys...
    Rule Low Severity
    Show

  • Wireless Networking

    Wireless networking, such as 802.11 (WiFi) and Bluetooth, can present a security risk to sensitive or classified systems and networks. Wireless net...
    Group
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  • Disable Wireless Through Software Configuration

    If it is impossible to remove the wireless hardware from the device in question, disable as much of it as possible through software. The following ...
    Group
    Show

  • Disable Unused Interfaces

    Network interfaces expand the attack surface of the system. Unused interfaces are not monitored or controlled, and should be disabled. <br><br> If...
    Group
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  • Transport Layer Security Support

    Support for Transport Layer Security (TLS), and its predecessor, the Secure Sockets Layer (SSL), is included in Red Hat Enterprise Linux in the Ope...
    Group
    Show

  • File Permissions and Masks

    Traditional Unix security relies heavily on file and directory permissions to prevent unauthorized users from reading or modifying files to which t...
    Group
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  • Verify Permissions on Important Files and Directories

    Permissions for many files on a system must be set restrictively to ensure sensitive information is properly protected. This section discusses impo...
    Group
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  • Verify that local System.map file (if exists) is readable only by root

    Files containing sensitive informations should be protected by restrictive permissions. Most of the time, there is no need that these files need ...
    Rule Unknown Severity
    Show

  • Enable Kernel Parameter to Enforce DAC on Hardlinks

    To set the runtime status of the <code>fs.protected_hardlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protecte...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Enforce DAC on Symlinks

    To set the runtime status of the <code>fs.protected_symlinks</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.protected...
    Rule Medium Severity
    Show

  • Verify Permissions on Files with Local Account Information and Credentials

    The default restrictive permissions for files which act as important security databases such as <code>passwd</code>, <code>shadow</code>, <code>gro...
    Group
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  • Verify Group Who Owns Backup group File

    To properly set the group owner of /etc/group-, run the command: 
    $ sudo chgrp root /etc/group-
    Rule Medium Severity
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  • Verify Group Who Owns Backup gshadow File

    To properly set the group owner of /etc/gshadow-, run the command: 
    $ sudo chgrp shadow /etc/gshadow-
    Rule Medium Severity
    Show

  • Verify Group Who Owns Backup passwd File

    To properly set the group owner of /etc/passwd-, run the command: 
    $ sudo chgrp root /etc/passwd-
    Rule Medium Severity
    Show

  • Verify User Who Owns Backup shadow File

    To properly set the group owner of /etc/shadow-, run the command: 
    $ sudo chgrp shadow /etc/shadow-
    Rule Medium Severity
    Show

  • Verify Group Who Owns group File

    To properly set the group owner of /etc/group, run the command: 
    $ sudo chgrp root /etc/group
    Rule Medium Severity
    Show

  • Verify Group Who Owns gshadow File

    To properly set the group owner of /etc/gshadow, run the command: 
    $ sudo chgrp shadow /etc/gshadow
    Rule Medium Severity
    Show

  • Verify Group Who Owns passwd File

    To properly set the group owner of /etc/passwd, run the command: 
    $ sudo chgrp root /etc/passwd
    Rule Medium Severity
    Show

  • Verify Group Who Owns shadow File

    To properly set the group owner of /etc/shadow, run the command: 
    $ sudo chgrp shadow /etc/shadow
    Rule Medium Severity
    Show

  • Verify User Who Owns Backup group File

    To properly set the owner of /etc/group-, run the command: 
    $ sudo chown root /etc/group-
    Rule Medium Severity
    Show

  • Verify User Who Owns Backup gshadow File

    To properly set the owner of /etc/gshadow-, run the command: 
    $ sudo chown root /etc/gshadow-
    Rule Medium Severity
    Show

  • Verify User Who Owns Backup passwd File

    To properly set the owner of /etc/passwd-, run the command: 
    $ sudo chown root /etc/passwd-
    Rule Medium Severity
    Show

  • Verify Group Who Owns Backup shadow File

    To properly set the owner of /etc/shadow-, run the command: 
    $ sudo chown root /etc/shadow-
    Rule Medium Severity
    Show

  • Verify User Who Owns group File

    To properly set the owner of /etc/group, run the command: 
    $ sudo chown root /etc/group
    Rule Medium Severity
    Show

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