Plex Media Server < 1.19.3 RCE 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:plex:plex_media_server";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.143878");
  script_version("2023-03-15T10:19:45+0000");
  script_tag(name:"last_modification", value:"2023-03-15 10:19:45 +0000 (Wed, 15 Mar 2023)");
  script_tag(name:"creation_date", value:"2020-05-11 09:20:41 +0000 (Mon, 11 May 2020)");
  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:H/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-07-17 22:15:00 +0000 (Fri, 17 Jul 2020)");

  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");
  script_cve_id("CVE-2020-5741");

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

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

  script_name("Plex Media Server < 1.19.3 RCE Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone Networks GmbH");
  script_family("Web application abuses");
  script_dependencies("gb_plex_media_server_http_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("plex_media_server/detected", "Host/runs_windows");

  script_tag(name:"summary", value:"Plex Media Server is prone to an authenticated remote code
  execution (RCE) vulnerability.");

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

  script_tag(name:"insight", value:"Deserialization of untrusted data in Plex Media Server allows a
  remote, authenticated attacker to execute arbitrary Python code.");

  script_tag(name:"affected", value:"Plex Media Server prior to version 1.19.3 on Windows.");

  script_tag(name:"solution", value:"Update to version 1.19.3 or later.");

  script_xref(name:"URL", value:"https://forums.plex.tv/t/security-regarding-cve-2020-5741/586819");
  script_xref(name:"URL", value:"https://www.tenable.com/security/research/tra-2020-32");

  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_is_less(version: version, test_version: "1.19.3")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "1.19.3", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);