Nextcloud Server 25.x < 25.0.3 DoS Vulnerability (GHSA-53q2-cm29-7j83)

# SPDX-FileCopyrightText: 2023 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("1.3.6.1.4.1.25623.1.0.127395");
  script_version("2026-06-10T06:59:19+0000");
  script_tag(name:"last_modification", value:"2026-06-10 06:59:19 +0000 (Wed, 10 Jun 2026)");
  script_tag(name:"creation_date", value:"2023-04-14 10:00:52 +0000 (Fri, 14 Apr 2023)");
  script_tag(name:"cvss_base", value:"6.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:N/I:N/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-03-07 16:38:00 +0000 (Tue, 07 Mar 2023)");

  script_cve_id("CVE-2023-25816");

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

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

  script_name("Nextcloud Server 25.x < 25.0.3 DoS Vulnerability (GHSA-53q2-cm29-7j83)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 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:"A user can configure a very long password consuming more
  resources on password validation then desired.");

  script_tag(name:"affected", value:"Nextcloud Server version 25.x prior to 25.0.3.");

  script_tag(name:"solution", value:"Update to version 25.0.3 or later.");

  script_xref(name:"URL", value:"https://github.com/nextcloud/security-advisories/security/advisories/GHSA-53q2-cm29-7j83");

  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_exclusive( version: version, test_version_lo: "25.0.0", test_version_up: "25.0.3" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "25.0.3", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );