yast2-rmt-1.0.4/src/lib/rmt/wizard_maria_db_page.rb:127
    RMT::Execute.on_target!(
      ['echo', 'select 1;'],
      [
        'mysql', '-u', @config['database']['username'], "-p#{@config['database']['password']}",
        '-D', @config['database']['database'], '-h', @config['database']['host']
      ]
    )

yast2-rmt-1.0.4/src/lib/rmt/wizard_maria_db_page.rb:173
    ret = RMT::Utils.run_command(
      "echo 'create database if not exists %1 character set = \"utf8\"' | mysql -u root -h %2 -p%3 2>/dev/null",
      @config['database']['database'],
      @config['database']['host'],
      @root_password
    )

yast2-rmt-1.0.4/src/lib/rmt/wizard_maria_db_page.rb:186
      ret = RMT::Utils.run_command(
        "echo 'grant all on %1.* to \"%2\"\@%3 identified by \"%4\"' | mysql -u root -h %5 -p%6 >/dev/null",
        @config['database']['database'],
        @config['database']['username'],
        @config['database']['host'],
        @config['database']['password'],
        @config['database']['host'],
        @root_password
      )

yast2-rmt-1.0.4/src/lib/rmt/maria_db/current_root_password_dialog.rb:39
    RMT::Utils.run_command(
      "echo 'show databases;' | mysql -u root -p%1 2>/dev/null",
      password
    ) == 0

While these commands run the passwords are exposed on the commandline. Please use a different way of passing the password. You can uses an option file (please create that in a secure way and ensure that you overwrite and remove it afterwards).