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Guide to the Secure Configuration of Anolis OS 23

Rules, Groups, and Values defined within the XCCDF Benchmark

  • net.ipv4.conf.default.secure_redirects

    Enable to prevent hijacking of routing path by only allowing redirects from gateways known in routing table. Disable to refuse acceptance of secure ICMP redirected packages by default.
    Value
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  • net.ipv4.conf.default.shared_media

    Controls whether the system can send(router) or accept(host) RFC1620 shared media redirects. <code>shared_media</code> for the interface will be enabled if at least one of conf/{all,interface}/shar...
    Value
    Show

  • net.ipv4.icmp_echo_ignore_broadcasts

    Ignore all ICMP ECHO and TIMESTAMP requests sent to it via broadcast/multicast
    Value
    Show

  • net.ipv4.icmp_ignore_bogus_error_responses

    Enable to prevent unnecessary logging
    Value
    Show

  • net.ipv4.tcp_syncookies

    Enable to turn on TCP SYN Cookie Protection
    Value
    Show

  • Disable Accepting ICMP Redirects for All IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.accept_redirects=0</pre> To mak...
    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.ipv4.conf.all.arp_filter=<xccdf-1.2:sub idref="xccd...
    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.ipv4.conf.all.arp_ignore=<xccdf-1.2:sub idref="xccd...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Use Reverse Path Filtering on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.rp_filter</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.rp_filter=1</pre> To make sure that th...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting Secure ICMP Redirects on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.secure_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.secure_redirects=0</pre> To mak...
    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.ipv4.conf.all.shared_media=<xccdf-1.2:sub idref="...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for Accepting ICMP Redirects by Default on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.default.accept_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.default.accept_redirects=0</pre...
    Rule Medium Severity
    Show

  • Configure Kernel Parameter for Accepting Secure Redirects By Default

    To set the runtime status of the <code>net.ipv4.conf.default.secure_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.default.secure_redirects=0</pre...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Ignore ICMP Broadcast Echo Requests on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.icmp_echo_ignore_broadcasts</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=1</pre> To...
    Rule Medium Severity
    Show

  • Enable Kernel Parameter to Ignore Bogus ICMP Error Responses on IPv4 Interfaces

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

  • Enable Kernel Parameter to Use TCP Syncookies on Network Interfaces

    To set the runtime status of the <code>net.ipv4.tcp_syncookies</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.tcp_syncookies=1</pre> To make sure that the settin...
    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 traffic.
    Group
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  • Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.conf.all.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.conf.all.send_redirects=0</pre> To make su...
    Rule Medium Severity
    Show

  • Disable Kernel Parameter for IP Forwarding on IPv4 Interfaces

    To set the runtime status of the <code>net.ipv4.ip_forward</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.ip_forward=0</pre> To make sure that the setting is per...
    Rule Medium Severity
    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 iptables suite of commands. iptables provide a compl...
    Group
    Show

  • Uncommon Network Protocols

    The system includes support for several network protocols which are not commonly used. Although security vulnerabilities in kernel networking code are not frequently discovered, the consequences ca...
    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 between nodes in a cluster. To configure the syst...
    Rule Low Severity
    Show

  • Disable SCTP Support

    The Stream Control Transmission Protocol (SCTP) is a transport layer protocol, designed to support the idea of message-oriented communication, with several streams of messages within one connection...
    Rule Medium 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 system to prevent the <code>tipc</code> kernel module...
    Rule Low Severity
    Show

  • Verify Group Who Owns Backup gshadow File

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

  • 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 methods can disable software support for wireless ...
    Group
    Show

  • Deactivate Wireless Network Interfaces

    Deactivating wireless network interfaces should prevent normal usage of the wireless capability. <br> <br> Configure the system to disable all wireless network interfaces with the followi...
    Rule Medium Severity
    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 they should not have access. <br> <br> Severa...
    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 important permission restrictions which can be verifie...
    Group
    Show

  • Verify Permissions on System.map Files

    The System.map files are symbol map files generated during the compilation of the Linux kernel. They contain the mapping between kernel symbols and their corresponding memory addresses. In general,...
    Rule Low Severity
    Show

  • Ensure All SUID Executables Are Authorized

    The SUID (set user id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthorized SUID files is determine if any were not installe...
    Rule Medium Severity
    Show

  • Ensure No World-Writable Files Exist

    It is generally a good idea to remove global (other) write access to a file when it is discovered. However, check with documentation for specific applications before making changes. Also, monitor f...
    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_symlinks=1</pre> To make sure that the setting is...
    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>group</code>, and <code>gshadow</code> files must be ...
    Group
    Show

  • 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
    Show

  • Verify Permissions on Backup passwd File

    To properly set the permissions of /etc/passwd-, run the command: 
    $ sudo chmod 0644 /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 root /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 root /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 root /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

  • Verify User Who Owns 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 passwd File

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

  • Verify Permissions on Backup group File

    To properly set the permissions of /etc/group-, run the command: 
    $ sudo chmod 0644 /etc/group-
    Rule Medium Severity
    Show

  • Verify Permissions on gshadow File

    To properly set the permissions of /etc/gshadow, run the command: 
    $ sudo chmod 0000 /etc/gshadow
    Rule Medium Severity
    Show

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