Nextcloud Server DoS Vulnerability (GHSA-c7vq-m7f8-rx37)

# SPDX-FileCopyrightText: 2025 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("1.3.6.1.4.1.25623.1.0.154512");
  script_version("2025-09-22T07:08:28+0000");
  script_tag(name:"last_modification", value:"2025-09-22 07:08:28 +0000 (Mon, 22 Sep 2025)");
  script_tag(name:"creation_date", value:"2025-05-20 02:28:02 +0000 (Tue, 20 May 2025)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2025-09-19 17:41:47 +0000 (Fri, 19 Sep 2025)");

  script_cve_id("CVE-2025-47791");

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

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

  script_name("Nextcloud Server DoS Vulnerability (GHSA-c7vq-m7f8-rx37)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_nextcloud_server_http_detect.nasl");
  script_mandatory_keys("nextcloud/server/detected");

  script_tag(name:"summary", value:"Nextcloud Server is prone to a denial of service (DoS)
  vulnerability.");

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

  script_tag(name:"insight", value:"An nowadays unused endpoint to verify a share recipient is not
  protected correctly, allowing to proxy requests to another server.");

  script_tag(name:"affected", value:"Nextcloud Server prior to version 28.0.13, 29.x prior to
  29.0.10 and 30.x prior to 30.0.3.");

  script_tag(name:"solution", value:"Update to version 28.0.13, 29.0.10, 30.0.3 or later.");

  script_xref(name:"URL", value:"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-c7vq-m7f8-rx37");

  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: "28.0.13")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "28.0.13", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "29.0.0", test_version_up: "29.0.10")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "29.0.10", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "30.0.0", test_version_up: "30.0.3")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "30.0.3", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);