Moodle 3.8.x < 3.8.7, 3.9.x < 3.9.4, 3.10.x < 3.10.1 Information Disclosure 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:moodle:moodle";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.145280");
  script_version("2021-08-17T06:00:55+0000");
  script_tag(name:"last_modification", value:"2021-08-17 06:00:55 +0000 (Tue, 17 Aug 2021)");
  script_tag(name:"creation_date", value:"2021-01-29 06:27:50 +0000 (Fri, 29 Jan 2021)");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-02-01 14:55:00 +0000 (Mon, 01 Feb 2021)");

  script_cve_id("CVE-2021-20184");

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

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

  script_name("Moodle 3.8.x < 3.8.7, 3.9.x < 3.9.4, 3.10.x < 3.10.1 Information Disclosure Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 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 information disclosure vulnerability.");

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

  script_tag(name:"insight", value:"Insufficient capability checks in some grade related web services meant
  students were able to view other students' grades.");

  script_tag(name:"affected", value:"Moodle versions 3.8 to 3.8.6, 3.9 to 3.9.3 and 3.10.");

  script_tag(name:"solution", value:"Update to version 3.8.7, 3.9.4, 3.10.1 or later.");

  script_xref(name:"URL", value:"https://moodle.org/mod/forum/discuss.php?d=417167");

  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: "3.8.0", test_version2: "3.8.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.8.7", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.9.0", test_version2: "3.9.3")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.9.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version =~ "^3\.10" && version_is_less(version: version, test_version: "3.10.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.10.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);