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Guide to the Secure Configuration of Debian 10

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Sudo - timestamp_timeout value

    Defines the number of minutes that can elapse before <code>sudo</code> will ask for a passwd again. If set to a value less than 0 the user's time stamp will never expire. Defining 0 means always pr...
    Value
  • Sudo - umask value

    Specify the sudo umask to use. The actual umask value that is used is the union of the user's umask and the sudo umask. The default sudo umask is 0022. This guarantess sudo never lowers the umask w...
    Value
  • Ensure Privileged Escalated Commands Cannot Execute Other Commands - sudo NOEXEC

    The sudo <code>NOEXEC</code> tag, when specified, prevents user executed commands from executing other commands, like a shell for example. This should be enabled by making sure that the <code>NOEXE...
    Rule High Severity
  • Ensure Only Users Logged In To Real tty Can Execute Sudo - sudo requiretty

    The sudo <code>requiretty</code> tag, when specified, will only execute sudo commands from users logged in to a real tty. This should be enabled by making sure that the <code>requiretty</code> tag ...
    Rule Medium Severity
  • Ensure Only Users Logged In To Real tty Can Execute Sudo - sudo use_pty

    The sudo <code>use_pty</code> tag, when specified, will only execute sudo commands from users logged in to a real tty. This should be enabled by making sure that the <code>use_pty</code> tag exists...
    Rule Medium Severity
  • Ensure Sudo Logfile Exists - sudo logfile

    A custom log sudo file can be configured with the 'logfile' tag. This rule configures a sudo custom logfile at the default location suggested by CIS, which uses /var/log/sudo.log.
    Rule Low Severity
  • Ensure Users Re-Authenticate for Privilege Escalation - sudo !authenticate

    The sudo <code>!authenticate</code> option, when specified, allows a user to execute commands using sudo without having to authenticate. This should be disabled by making sure that the <code>!authe...
    Rule Medium Severity
  • Ensure Users Re-Authenticate for Privilege Escalation - sudo NOPASSWD

    The sudo <code>NOPASSWD</code> tag, when specified, allows a user to execute commands using sudo without having to authenticate. This should be disabled by making sure that the <code>NOPASSWD</code...
    Rule Medium Severity
  • Ensure Users Re-Authenticate for Privilege Escalation - sudo

    The sudo <code>NOPASSWD</code> and <code>!authenticate</code> option, when specified, allows a user to execute commands using sudo without having to authenticate. This should be disabled by making ...
    Rule Medium Severity
  • Remote Login Banner Verbiage

    Enter an appropriate login banner for your organization. Please note that new lines must be expressed by the '\n' character and special characters like parentheses and quotation marks must be escap...
    Value
  • Only the VDSM User Can Use sudo NOPASSWD

    The sudo <code>NOPASSWD</code> tag, when specified, allows a user to execute commands using sudo without having to authenticate. Only the <code>vdsm</code> user should have this capability in any s...
    Rule Medium Severity
  • Explicit arguments in sudo specifications

    All commands in the sudoers file must strictly specify the arguments allowed to be used for a given user. If the command is supposed to be executed only without arguments, pass "" as an argument in...
    Rule Medium Severity
  • Don't define allowed commands in sudoers by means of exclusion

    Policies applied by sudo through the sudoers file should not involve negation. Each user specification in the <code>sudoers</code> file contains a comma-delimited list of command specifications. T...
    Rule Medium Severity
  • Don't target root user in the sudoers file

    The targeted users of a user specification should be, as much as possible, non privileged users (i.e.: non-root). User specifications have to explicitly list the runas spec (i.e. the list of targe...
    Rule Medium Severity
  • System Tooling / Utilities

    The following checks evaluate the system for recommended base packages -- both for installation and removal.
    Group
  • Ensure gnutls-utils is installed

    The gnutls-utils package can be installed with the following command:
    $ apt-get install gnutls-utils
    Rule Medium Severity
  • Ensure nss-tools is installed

    The nss-tools package can be installed with the following command:
    $ apt-get install nss-tools
    Rule Medium Severity
  • Updating Software

    The <code>apt_get</code> command line tool is used to install and update software packages. The system also provides a graphical software update tool in the <b>System</b> menu, in the <b>Administra...
    Group
  • Account and Access Control

    In traditional Unix security, if an attacker gains shell access to a certain login account, they can perform any action or access any file to which that account has access. Therefore, making it mor...
    Group
  • Authselect profile

    Specify the authselect profile to select
    Value

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