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Guide to the Secure Configuration of Alibaba Cloud Linux 3

Rules, Groups, and Values defined within the XCCDF Benchmark

  • 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
  • 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 n...
    Rule Medium Severity
  • Disable Kernel Parameter for Sending ICMP Redirects on all IPv4 Interfaces by Default

    To set the runtime status of the <code>net.ipv4.conf.default.send_redirects</code> kernel parameter, run the following command: <pre>$ sudo sysctl ...
    Rule Medium Severity
  • 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_fo...
    Rule Medium Severity
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Nftables Families

    Netfilter enables filtering at multiple networking levels. With iptables there is a separate tool for each level: iptables, ip6tables, arptables, ...
    Value
  • Nftables Master configuration file

    The file which contains top level configuration for nftables service, and with which, the service is started.
    Value
  • 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
  • Verify nftables Service is Disabled

    nftables is a subsystem of the Linux kernel providing filtering and classification of network packets/datagrams/frames and is the successor to ipta...
    Rule Medium Severity
  • SuSEfirewall2

    The SuSEfirewall2 provides a managed firewall.
    Group
  • 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
  • Verify ufw Enabled

    The ufw service can be enabled with the following command:
    $ sudo systemctl enable ufw.service
    Rule Medium Severity
  • Uncommon Network Protocols

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

    The Datagram Congestion Control Protocol (DCCP) is a relatively new transport layer protocol, designed to support streaming media and telephony. T...
    Rule Medium Severity
  • 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
  • Disable SCTP Support

    The Stream Control Transmission Protocol (SCTP) is a transport layer protocol, designed to support the idea of message-oriented communication, with...
    Rule Medium Severity
  • 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
  • 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
  • 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
  • Deactivate Wireless Network Interfaces

    Deactivating wireless network interfaces should prevent normal usage of the wireless capability. <br><br> Configure the system to disable all wire...
    Rule Medium Severity
  • 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
  • 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
  • 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
  • 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
  • Ensure All SGID Executables Are Authorized

    The SGID (set group id) bit should be set only on files that were installed via authorized means. A straightforward means of identifying unauthoriz...
    Rule Medium Severity
  • 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 unauthorize...
    Rule Medium Severity
  • 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 a...
    Rule Medium Severity
  • Ensure All Files Are Owned by a Group

    If any file is not group-owned by a group present in /etc/group, the cause of the lack of group-ownership must be investigated. Following this, tho...
    Rule Medium Severity
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • Verify User Who Owns /var/log Directory

    To properly set the owner of /var/log, run the command:
    $ sudo chown root /var/log 
    Rule Medium Severity
  • 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
  • Verify User Who Owns shadow File

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

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