Moodle 3.7.x < 3.7.8, 3.8.x < 3.8.5, 3.9.x < 3.9.2 Input Escape Vulnerability

# Copyright (C) 2020 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:moodle:moodle";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.145017");
  script_version("2021-07-05T11:01:33+0000");
  script_tag(name:"last_modification", value:"2021-07-05 11:01:33 +0000 (Mon, 05 Jul 2021)");
  script_tag(name:"creation_date", value:"2020-12-10 06:12:49 +0000 (Thu, 10 Dec 2020)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-12-08 16:04:00 +0000 (Tue, 08 Dec 2020)");

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

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

  script_cve_id("CVE-2020-25631");

  script_name("Moodle 3.7.x < 3.7.8, 3.8.x < 3.8.5, 3.9.x < 3.9.2 Input Escape Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_moodle_cms_detect.nasl");
  script_mandatory_keys("moodle/detected");

  script_tag(name:"summary", value:"Moodle is prone to an input escape vulnerability.");

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

  script_tag(name:"insight", value:"A vulnerability was found where it is possible to include JavaScript in a
  book's chapter title, which is not escaped on the 'Add new chapter' page.");

  script_tag(name:"affected", value:"Moodle versions 3.7 to 3.7.7, 3.8 to 3.8.4 and 3.9 to 3.9.1.");

  script_tag(name:"solution", value:"Update to version 3.7.8, 3.8.5, 3.9.2 or later.");

  script_xref(name:"URL", value:"https://moodle.org/mod/forum/discuss.php?d=410843");

  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: "3.7.0", test_version2: "3.7.7")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.7.8", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.8.0", test_version2: "3.8.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.8.5", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.9.0", test_version2: "3.9.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.9.2", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);