Nextcloud Server < 21.0.9.17, 22.x < 22.2.10.22, 23.x < 23.0.12.17, 24.x < 24.0.12.14, 25.x < 25.0.13.8, 26.x < 26.0.13, 27.x < 27.1.8, 28.x < 28.0.4 Improper Authentication Vulnerability (GHSA-9v72-9xv5-3p7c)

# SPDX-FileCopyrightText: 2024 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:nextcloud:nextcloud_server";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.127776");
  script_version("2025-09-29T10:42:25+0000");
  script_tag(name:"last_modification", value:"2025-09-29 10:42:25 +0000 (Mon, 29 Sep 2025)");
  script_tag(name:"creation_date", value:"2024-06-18 08:00:29 +0000 (Tue, 18 Jun 2024)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:C/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2025-09-26 23:39:11 +0000 (Fri, 26 Sep 2025)");

  script_cve_id("CVE-2024-37313");

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

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

  script_name("Nextcloud Server < 21.0.9.17, 22.x < 22.2.10.22, 23.x < 23.0.12.17, 24.x < 24.0.12.14, 25.x < 25.0.13.8, 26.x < 26.0.13, 27.x < 27.1.8, 28.x < 28.0.4 Improper Authentication Vulnerability (GHSA-9v72-9xv5-3p7c)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2024 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_nextcloud_server_http_detect.nasl");
  script_mandatory_keys("nextcloud/server/detected");

  script_tag(name:"summary", value:"Nextcloud Server is prone to an improper authentication
  vulnerability.");

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

  script_tag(name:"insight", value:"Under some circumstance it was possible to bypass the second
  factor of 2FA after successfully providing the user credentials.");

  script_tag(name:"affected", value:"Nextcloud Server versions prior to 21.0.9.17, 22.x prior to
  22.2.10.22, 23.x prior to 23.0.12.17, 24.x prior to 24.0.12.14, 25.x prior to 25.0.13.8, 26.x
  prior to 26.0.13, 27.x prior to 27.1.8 and 28.x prior to 28.0.4.");

  script_tag(name:"solution", value:"Update to version 21.0.9.17, 22.2.10.22, 23.0.12.17,
  24.0.12.14, 25.0.13.8, 26.0.13, 27.1.8, 28.0.4 or later.");

  script_xref(name:"URL", value:"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-9v72-9xv5-3p7c");

  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: "21.0.9.17")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "21.0.9.17 (Nextcloud Enterprise only)", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "22.0.0", test_version_up: "22.2.10.22")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "22.2.10.22 (Nextcloud Enterprise only)", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "23.0.0", test_version_up: "23.0.12.17")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "23.0.12.17 (Nextcloud Enterprise only)", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "24.0.0", test_version_up: "24.0.12.14")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "24.0.12.14 (Nextcloud Enterprise only)", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "25.0.0", test_version_up: "25.0.13.8")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "25.0.13.8 (Nextcloud Enterprise only)", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "26.0.0", test_version_up: "26.0.13")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "26.0.13", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "27.0.0", test_version_up: "27.1.8")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "27.1.8", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "28.0.0", test_version_up: "28.0.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "28.0.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);