Python Use After Free Vulnerability (May 2025) - Linux

# 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("1.3.6.1.4.1.25623.1.0.171522");
  script_version("2025-10-10T05:39:02+0000");
  script_tag(name:"last_modification", value:"2025-10-10 05:39:02 +0000 (Fri, 10 Oct 2025)");
  script_tag(name:"creation_date", value:"2025-05-16 11:51:19 +0000 (Fri, 16 May 2025)");
  script_tag(name:"cvss_base", value:"4.0");
  script_tag(name:"cvss_base_vector", value:"AV:L/AC:H/Au:N/C:N/I:N/A:C");

  script_cve_id("CVE-2025-4516");

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

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

  script_name("Python Use After Free Vulnerability (May 2025) - Linux");

  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_unixoide");

  script_tag(name:"summary", value:"Python is prone to an use after free vulnerability.");

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

  script_tag(name:"insight", value:"There is an issue in CPython when using bytes.decode(). If you
  are not using the 'unicode_escape' encoding or an error handler your usage is not affected. To
  work-around this issue you may stop using the error= handler and instead wrap the bytes.decode()
  call in a try-except catching the DecodeError.");

  script_tag(name:"affected", value:"Python prior to version 3.9.23, 3.10.x prior to 3.10.18, 3.11.x
  prior to 3.11.13, 3.12.x prior to 3.12.11 and 3.13.x prior to 3.13.4.");

  script_tag(name:"solution", value:"Update to version 3.9.23, 3.10.18, 3.11.13, 3.12.11, 3.13.4 or
  later.");

  script_xref(name:"URL", value:"https://mail.python.org/archives/list/[email protected]/thread/L75IPBBTSCYEF56I2M4KIW353BB3AY74/");
  script_xref(name:"URL", value:"https://github.com/python/cpython/issues/133767");
  script_xref(name:"URL", value:"https://github.com/python/cpython/pull/129648");
  script_xref(name:"URL", value:"https://osv.dev/vulnerability/PSF-2025-4");
  # nb: The PSF seems to publish the affected / fixed versions in the "Product Status" part of
  # these since some time. So even it is a more generic link this should / will be always included.
  script_xref(name:"URL", value:"https://www.cve.org/CVERecord?id=CVE-2025-4516");

  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"];

if (version_is_less(version: version, test_version: "3.9.23")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.9.23", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "3.10", test_version_up: "3.10.18")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.10.18", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "3.11", test_version_up: "3.11.13")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.11.13", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "3.12", test_version_up: "3.12.11")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.12.11", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "3.13", test_version_up: "3.13.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.13.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);