Python 2.7.x < 2.7.16, 3.4.x < 3.4.10, 3.5.x < 3.5.7, 3.6.x < 3.6.7, 3.7.0 Python Issue (bpo-34623) - Linux

# SPDX-FileCopyrightText: 2021 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("1.3.6.1.4.1.25623.1.0.118243");
  script_version("2023-07-05T05:06:18+0000");
  script_tag(name:"last_modification", value:"2023-07-05 05:06:18 +0000 (Wed, 05 Jul 2023)");
  script_tag(name:"creation_date", value:"2021-10-04 12:04:36 +0200 (Mon, 04 Oct 2021)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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:"2020-07-29 12:15:00 +0000 (Wed, 29 Jul 2020)");

  script_cve_id("CVE-2018-14647");

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

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

  script_name("Python 2.7.x < 2.7.16, 3.4.x < 3.4.10, 3.5.x < 3.5.7, 3.6.x < 3.6.7, 3.7.0 Python Issue (bpo-34623) - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 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 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:"The flaw exists because Python's elementtree C accelerator
  fails to initialise Expat's hash salt during initialization");

  script_tag(name:"impact", value:"Successful exploitation allows denial of service attacks
  against Expat by constructing an XML document that would cause pathological hash collisions
  in Expat's internal data structures, consuming large amounts CPU and RAM.");

  script_tag(name:"affected", value:"Python versions 2.7.0 through 2.7.15, 3.4.0 through 3.4.9,
  3.5.0 through 3.5.6, 3.6.0 through 3.6.6 and 3.7.0.");

  script_tag(name:"solution", value:"Update to version 2.7.16, 3.4.10, 3.5.7, 3.6.7, 3.7.1 or later.");

  script_xref(name:"URL", value:"https://python-security.readthedocs.io/vuln/elementree_salt.html");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/105396");
  script_xref(name:"URL", value:"https://bugs.python.org/issue34623");
  script_xref(name:"URL", value:"https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14647");
  script_xref(name:"Advisory-ID", value:"bpo-34623");

  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: "2.7.16")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.7.16", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.4", test_version2: "3.4.9")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.4.10", install_path: location);
  security_message(port: port, data:report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.5", test_version2: "3.5.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.5.7", install_path: location);
  security_message(port: port, data:report);
  exit(0);
}

if (version_in_range(version: version, test_version: "3.6", test_version2: "3.6.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.6.7", install_path: location);
  security_message(port: port, data:report);
  exit(0);
}

if (version_is_equal(version: version, test_version: "3.7.0")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.7.1", install_path: location);
  security_message(port: port, data:report);
  exit(0);
}

exit(99);