Emby Server <= 4.7.6.0 Information Disclosure Vulnerability

# SPDX-FileCopyrightText: 2021 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:emby:emby.releases";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.146696");
  script_version("2023-06-30T16:09:17+0000");
  script_tag(name:"last_modification", value:"2023-06-30 16:09:17 +0000 (Fri, 30 Jun 2023)");
  script_tag(name:"creation_date", value:"2021-09-10 08:47:56 +0000 (Fri, 10 Sep 2021)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-09-16 14:22:00 +0000 (Thu, 16 Sep 2021)");

  script_cve_id("CVE-2021-32833");

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

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

  script_name("Emby Server <= 4.7.6.0 Information Disclosure Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_emby_server_http_detect.nasl", "os_detection.nasl");
  script_mandatory_keys("emby/media_server/detected", "Host/runs_windows"); # nb: Vulnerability targets Windows installations only

  script_tag(name:"summary", value:"Emby Server 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:"Emby Server has an arbitrary file read in
  /Videos/Id/hls/PlaylistId/SegmentId.SegmentContainer and an unauthenticated arbitrary image file
  read in /Images/Ratings/theme/name and /Images/MediaInfo/theme/name.");

  script_tag(name:"affected", value:"Emby Server version 4.7.6.0 and prior.");

  script_tag(name:"solution", value:"No known solution was made available for at least one year since
  the disclosure of this vulnerability. Likely none will be provided anymore. General solution options
  are to upgrade to a newer release, disable respective features, remove the product or replace the
  product by another one.");

  script_xref(name:"URL", value:"https://securitylab.github.com/advisories/GHSL-2021-051-emby/");

  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_equal(version: version, test_version: "4.7.6.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "None", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(0);