Icinga 2.4.0 < 2.11.10, 2.12.0 < 2.12.5 Privilege Escalation Vulnerability

# Copyright (C) 2021 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.

CPE = "cpe:/a:icinga:icinga2";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.146317");
  script_version("2021-08-17T12:00:57+0000");
  script_tag(name:"last_modification", value:"2021-08-17 12:00:57 +0000 (Tue, 17 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-07-19 02:36:49 +0000 (Mon, 19 Jul 2021)");
  script_tag(name:"cvss_base", value:"6.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-08-03 16:45:00 +0000 (Tue, 03 Aug 2021)");

  script_cve_id("CVE-2021-32739");

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

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

  script_name("Icinga 2.4.0 < 2.11.10, 2.12.0 < 2.12.5 Privilege Escalation Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_icinga2_detect.nasl");
  script_mandatory_keys("icinga2/detected");

  script_tag(name:"summary", value:"Icinga 2 is prone to a privilege escalation vulnerability.");

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

  script_tag(name:"insight", value:"A vulnerability exists that may allow privilege escalation for
  authenticated API users. With a read-only user's credentials, an attacker can view most attributes
  of all config objects including 'ticket_salt' of 'ApiListener'. This salt is enough to compute a
  ticket for every possible common name (CN). A ticket, the master node's certificate, and a
  self-signed certificate are enough to successfully request the desired certificate from Icinga.
  That certificate may in turn be used to steal an endpoint or API user's identity.");

  script_tag(name:"affected", value:"Icinga2 version 2.4.0 through 2.11.9 and 2.12.0 through 2.12.4.");

  script_tag(name:"solution", value:"Update to version 2.11.10, 2.12.5 or later.");

  script_xref(name:"URL", value:"https://github.com/Icinga/icinga2/security/advisories/GHSA-98wp-jc6q-x5q5");

  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_in_range(version: version, test_version: "2.4.0", test_version2: "2.11.9")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.11.10", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "2.12.0", test_version2: "2.12.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.12.5", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);