Python DoS Vulnerability (Dec 2025) - Windows

# 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:python:python";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.125554");
  script_version("2026-02-11T06:03:51+0000");
  script_tag(name:"last_modification", value:"2026-02-11 06:03:51 +0000 (Wed, 11 Feb 2026)");
  script_tag(name:"creation_date", value:"2025-12-02 17:18:01 +0000 (Tue, 02 Dec 2025)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2026-02-10 19:58:12 +0000 (Tue, 10 Feb 2026)");

  script_cve_id("CVE-2025-13836");

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

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

  script_name("Python DoS Vulnerability (Dec 2025) - Windows");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_python_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("python/detected", "Host/runs_windows");

  script_tag(name:"summary", value:"Python 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:"When reading an HTTP response from a server, if no read amount
  is specified, the default behavior will be to use Content-Length. This allows a malicious
  server to cause the client to read large amounts of data into memory, potentially causing
  out-of-memory (OOM) or other DoS conditions.");

  script_tag(name:"affected", value:"Python prior to version 3.13.11 and 3.14.x prior to 3.14.1.

  Note: Fixes have been backported to maintenance branches (3.10, 3.12) but specific
  patch versions are not yet available.");

  script_tag(name:"solution", value:"Update to version 3.14.1 or later, or to the latest
  maintenance release of your Python version series (3.10.x, 3.12.x) once patches
  are available. Please see the references for more information.");

  script_xref(name:"URL", value:"https://github.com/python/cpython/issues/119451");
  script_xref(name:"URL", value:"https://github.com/python/cpython/pull/119454");
  script_xref(name:"URL", value:"https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155");
  script_xref(name:"URL", value:"https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5");
  script_xref(name:"URL", value:"https://www.cve.org/CVERecord?id=CVE-2025-13836");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (isnull(port = get_app_port(cpe: CPE)))
  exit(0);

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE,
                                          version_regex: "^[0-9]+\.[0-9]+\.[0-9]+"))
  exit(0);

version = infos["version"];
location = infos["location"];

# TODO: Check the CVE entry again in 1/2 months to see if additional fixes for older branches have
# been published.
if (version_is_less(version: version, test_version: "3.13.11")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.13.11", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "3.14.0", test_version_up: "3.14.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.14.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);