Python Buffer Over-Read Vulnerability (Jul 2024) - Linux

# 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:python:python";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.114744");
  script_version("2024-08-14T05:05:52+0000");
  script_tag(name:"last_modification", value:"2024-08-14 05:05:52 +0000 (Wed, 14 Aug 2024)");
  script_tag(name:"creation_date", value:"2024-08-13 08:37:31 +0000 (Tue, 13 Aug 2024)");
  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_cve_id("CVE-2024-5642");

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

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

  script_name("Python Buffer Over-Read Vulnerability (Jul 2024) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2024 Greenbone AG");
  script_family("General");
  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 a buffer over-read vulnerability in
  SSLContext.set_npn_protocols().");

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

  script_tag(name:"insight", value:"The product doesn't disallow configuring an empty list ('[]')
  for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This
  results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability
  is of low severity due to NPN being not widely used and specifying an empty list likely being
  uncommon in-practice (typically a protocol name would be configured).");

  script_tag(name:"affected", value:"Python versions prior to 3.10.");

  script_tag(name:"solution", value:"Suggested mitigation by the vendor is one of the following:

  - Update to Python 3.10 or later where NPN isn't supported

  - Avoid using NPN via SSLContext.set_npn_protocols()

  - Avoid providing an empty list as a parameter to SSLContext.set_npn_protocols()");

  script_xref(name:"URL", value:"https://mail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/");
  script_xref(name:"URL", value:"https://github.com/python/cpython/pull/23014");
  script_xref(name:"URL", value:"https://github.com/python/cpython/issues/121227");
  script_xref(name:"URL", value:"https://osv.dev/vulnerability/PSF-2024-6");

  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: "3.10.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.10.0", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);