Kentico CMS 9.x < 9.0.51 / 10.x < 10.0.48 Access Control Bypass Vulnerability

# Copyright (C) 2018 Greenbone Networks GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if( description )
{
  script_oid("1.3.6.1.4.1.25623.1.0.112248");
  script_version("2021-12-07T13:21:50+0000");
  script_tag(name:"last_modification", value:"2021-12-07 13:21:50 +0000 (Tue, 07 Dec 2021)");
  script_tag(name:"creation_date", value:"2018-02-20 14:34:43 +0100 (Tue, 20 Feb 2018)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");

  script_tag(name:"qod_type", value:"remote_banner");

  script_tag(name:"solution_type", value:"VendorFix");

  script_cve_id("CVE-2017-17736");

  script_name("Kentico CMS 9.x < 9.0.51 / 10.x < 10.0.48 Access Control Bypass Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2018 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_kentico_cms_http_detect.nasl");
  script_mandatory_keys("kentico_cms/detected");

  script_tag(name:"summary", value:"Kentico CMS is prone to an access control bypass
  vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"Kentico CMS is vulnerable to an access control bypass as it
  fails to properly restrict access the installation wizard. It is possible for anunauthenticated
  user to gain access to these pages and perform actions such as installing a new starter site or
  obtaining access to the 'New site wizard', which automatically authenticates as the Global
  Administrator.");

  script_tag(name:"impact", value:"An unauthenticated attacker may leverage this issue to gain
  Global Administrator access to a Kentico installation. From there it is possible to perform
  administrative actions, install news sites or potentially obtain remote code execution.");

  script_tag(name:"affected", value:"Kentico CMS versions 9.x prior to 9.0.51 and 10.x prior to
  10.0.48.");

  script_tag(name:"solution", value:"Update to version 9.0.51, 10.0.48 or later.");

  script_xref(name:"URL", value:"https://blog.hivint.com/advisory-access-control-bypass-in-kentico-cms-cve-2017-17736-49e1e43ae55b");

  exit(0);
}

CPE = "cpe:/a:kentico:kentico";

include( "host_details.inc" );
include( "version_func.inc" );

if( ! port = get_app_port( cpe: CPE ) )
  exit( 0 );

if( ! infos = get_app_version_and_location( cpe: CPE, port: port, exit_no_version: TRUE ) )
  exit( 0 );

version = infos["version"];
location = infos["location"];

if( version =~ "^9\.0" && version_is_less( version: version, test_version: "9.0.51" ) )
  fix = "9.0.51";

else if( version =~ "^10\.0" && version_is_less( version: version, test_version: "10.0.48" ) )
  fix = "10.0.48";

if( fix ) {
  report = report_fixed_ver( installed_version: version, fixed_version: fix, install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );