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

# SPDX-FileCopyrightText: 2018 Greenbone AG
# 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-only

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

if( description )
{
  script_oid("1.3.6.1.4.1.25623.1.0.112248");
  script_version("2025-03-25T05:38:56+0000");
  script_tag(name:"last_modification", value:"2025-03-25 05:38:56 +0000 (Tue, 25 Mar 2025)");
  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)");

  # nb: Only major version extracted in newer versions
  script_tag(name:"qod_type", value:"remote_banner_unreliable");

  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 AG");
  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);
}

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 );