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Guide to the Secure Configuration of Alibaba Cloud Linux 2

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Restrict Dynamic Mounting and Unmounting of Filesystems

    Linux includes a number of facilities for the automated addition and removal of filesystems on a running system. These facilities may be necessary in many environments, but this capability also ca...
    Group
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  • Disable Kernel Support for USB via Bootloader Configuration

    All USB support can be disabled by adding the <code>nousb</code> argument to the kernel's boot loader configuration. To do so, append "nousb" to the kernel line in <code>/etc/default/grub</code> as...
    Rule Unknown Severity
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  • Restrict Programs from Dangerous Execution Patterns

    The recommendations in this section are designed to ensure that the system's features to protect against potentially dangerous program execution are activated. These protections are applied at the ...
    Group
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  • Disable the uvcvideo module

    If the device contains a camera it should be covered or disabled when not in use.
    Rule Medium Severity
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  • Disable core dump backtraces

    The <code>ProcessSizeMax</code> option in <code>[Coredump]</code> section of <code>/etc/systemd/coredump.conf</code> specifies the maximum size in bytes of a core which will be processed. Core dump...
    Rule Medium Severity
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  • Disable storing core dump

    The Storage option in [Coredump] sectionof /etc/systemd/coredump.conf can be set to none to disable storing core dumps permanently.
    Rule Medium Severity
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  • Disable Core Dumps for All Users

    To disable core dumps for all users, add the following line to <code>/etc/security/limits.conf</code>, or to a file within the <code>/etc/security/limits.d/</code> directory: <pre>* hard core...
    Rule Medium Severity
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  • Disable Core Dumps for SUID programs

    To set the runtime status of the <code>fs.suid_dumpable</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w fs.suid_dumpable=0</pre> To make sure that the setting is persisten...
    Rule Medium Severity
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  • Enable ExecShield

    ExecShield describes kernel features that provide protection against exploitation of memory corruption errors such as buffer overflows. These features include random placement of the stack and othe...
    Group
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  • kernel.kptr_restrict

    Configure exposition of kernel pointer addresses
    Value
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  • Restrict Exposed Kernel Pointer Addresses Access

    To set the runtime status of the <code>kernel.kptr_restrict</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w kernel.kptr_restrict=<xccdf-1.2:sub idref="xccdf_org.ssgproject...
    Rule Medium Severity
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  • SELinux policy

    Type of policy in use. Possible values are:
    targeted - Only targeted network daemons are protected.
    strict - Full SELinux protection.
    mls - Multiple levels of security
    Value
    Show

  • SELinux state

    enforcing - SELinux security policy is enforced.
    permissive - SELinux prints warnings instead of enforcing.
    disabled - SELinux is fully disabled.
    Value
    Show

  • Install libselinux Package

    The libselinux package can be installed with the following command: 
    $ sudo yum install libselinux
    Rule High Severity
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  • Ensure SELinux Not Disabled in /etc/default/grub

    SELinux can be disabled at boot time by an argument in <code>/etc/default/grub</code>. Remove any instances of <code>selinux=0</code> from the kernel arguments in that file to prevent SELinux from ...
    Rule Medium Severity
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  • Ensure No Daemons are Unconfined by SELinux

    Daemons for which the SELinux policy does not contain rules will inherit the context of the parent process. Because daemons are launched during startup and descend from the <code>init</code> proces...
    Rule Medium Severity
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  • Ensure SELinux State is Enforcing

    The SELinux state should be set to <code><xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_selinux_state" use="legacy"></xccdf-1.2:sub></code> at system boot time. In the file <code>/et...
    Rule High Severity
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  • Avahi Server

    The Avahi daemon implements the DNS Service Discovery and Multicast DNS protocols, which provide service and host discovery on a network. It allows a system to automatically identify resources on t...
    Group
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  • 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>/etc/avahi/avahi-daemon.conf</code>. The following se...
    Group
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  • 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>[publish]</code> section: <pre>disable-publishing=yes...
    Rule Low Severity
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  • 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 to such attacks.
    Group
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  • 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
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  • Base Services

    This section addresses the base services that are installed on a Alibaba Cloud Linux 2 default installation which are not covered in other sections. Some of these services listen on the network and...
    Group
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  • Disable Odd Job Daemon (oddjobd)

    The <code>oddjobd</code> service exists to provide an interface and access control mechanism through which specified privileged tasks can run tasks for unprivileged client applications. Communicati...
    Rule Medium Severity
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  • Disable Network Router Discovery Daemon (rdisc)

    The <code>rdisc</code> service implements the client side of the ICMP Internet Router Discovery Protocol (IRDP), which allows discovery of routers on the local subnet. If a router is discovered the...
    Rule Medium Severity
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  • Cron and At Daemons

    The cron and at services are used to allow commands to be executed at a later time. The cron service is required by almost all systems to perform necessary maintenance tasks, while at may or may no...
    Group
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  • Install the cron service

    The Cron service should be installed.
    Rule Medium Severity
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  • Enable cron Service

    The <code>crond</code> service is used to execute commands at preconfigured times. It is required by almost all systems to perform necessary maintenance tasks, such as notifying root of system acti...
    Rule Medium Severity
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  • Disable At Service (atd)

    The <code>at</code> and <code>batch</code> commands can be used to schedule tasks that are meant to be executed only once. This allows delayed execution in a manner similar to cron, except that it ...
    Rule Medium Severity
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  • Verify Group Who Owns cron.d

    To properly set the group owner of /etc/cron.d, run the command: 
    $ sudo chgrp root /etc/cron.d
    Rule Medium Severity
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  • Verify Group Who Owns cron.daily

    To properly set the group owner of /etc/cron.daily, run the command: 
    $ sudo chgrp root /etc/cron.daily
    Rule Medium Severity
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  • Uninstall the nis package

    The support for Yellowpages should not be installed unless it is required.
    Rule Low Severity
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  • Verify Group Who Owns cron.monthly

    To properly set the group owner of /etc/cron.monthly, run the command: 
    $ sudo chgrp root /etc/cron.monthly
    Rule Medium Severity
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  • Verify Group Who Owns cron.weekly

    To properly set the group owner of /etc/cron.weekly, run the command: 
    $ sudo chgrp root /etc/cron.weekly
    Rule Medium Severity
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  • Verify Group Who Owns Crontab

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

  • Verify Owner on cron.d

    To properly set the owner of /etc/cron.d, run the command: 
    $ sudo chown root /etc/cron.d
    Rule Medium Severity
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  • Verify Owner on cron.hourly

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

  • Verify Owner on cron.monthly

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

  • Verify Owner on cron.weekly

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

  • Verify Owner on crontab

    To properly set the owner of /etc/crontab, run the command: 
    $ sudo chown root /etc/crontab
    Rule Medium Severity
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  • Verify Permissions on cron.d

    To properly set the permissions of /etc/cron.d, run the command: 
    $ sudo chmod 0700 /etc/cron.d
    Rule Medium Severity
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  • Verify Permissions on cron.daily

    To properly set the permissions of /etc/cron.daily, run the command: 
    $ sudo chmod 0700 /etc/cron.daily
    Rule Medium Severity
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  • Verify Permissions on cron.hourly

    To properly set the permissions of /etc/cron.hourly, run the command: 
    $ sudo chmod 0700 /etc/cron.hourly
    Rule Medium Severity
    Show

  • Verify Permissions on cron.monthly

    To properly set the permissions of /etc/cron.monthly, run the command: 
    $ sudo chmod 0700 /etc/cron.monthly
    Rule Medium Severity
    Show

  • Verify Permissions on crontab

    To properly set the permissions of /etc/crontab, run the command: 
    $ sudo chmod 0600 /etc/crontab
    Rule Medium Severity
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  • Ensure that /etc/at.deny does not exist

    The file /etc/at.deny should not exist. Use /etc/at.allow instead.
    Rule Medium Severity
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  • Ensure that /etc/cron.deny does not exist

    The file /etc/cron.deny should not exist. Use /etc/cron.allow instead.
    Rule Medium Severity
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  • Verify Group Who Owns /etc/at.allow file

    If <code>/etc/at.allow</code> exists, it must be group-owned by <code>root</code>. To properly set the group owner of <code>/etc/at.allow</code>, run the command: <pre>$ sudo chgrp root /etc/at.al...
    Rule Medium Severity
    Show

  • Verify Group Who Owns /etc/cron.allow file

    If <code>/etc/cron.allow</code> exists, it must be group-owned by <code>root</code>. To properly set the group owner of <code>/etc/cron.allow</code>, run the command: <pre>$ sudo chgrp root /etc/c...
    Rule Medium Severity
    Show

  • Verify User Who Owns /etc/at.allow file

    If <code>/etc/at.allow</code> exists, it must be owned by <code>root</code>. To properly set the owner of <code>/etc/at.allow</code>, run the command: <pre>$ sudo chown root /etc/at.allow </pre> ...
    Rule Medium Severity
    Show

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