Beckhoff TwinCAT Malformed UDP Packet Improper Resource Shutdown or Release (CVE-2019-5636)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(500343);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/12");

  script_cve_id("CVE-2019-5636");

  script_name(english:"Beckhoff TwinCAT Malformed UDP Packet Improper Resource Shutdown or Release (CVE-2019-5636)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"When a Beckhoff TwinCAT Runtime receives a malformed UDP packet, the ADS Discovery Service shuts down. Note that the
TwinCAT devices are still performing as normal. This issue affects TwinCAT 2 version 2304 (and prior) and TwinCAT 3.1
version 4204.0 (and prior). 

This plugin only works with Tenable.ot. Please visit
https://www.tenable.com/products/tenable-ot for more information.");
  # https://download.beckhoff.com/download/Document/product-security/Advisories/advisory-2019-004.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e7c8556b");
  # https://blog.rapid7.com/2019/10/08/r7-2019-32-denial-of-service-vulnerabilities-in-beckhoff-twincat-plc-environment-fixed/
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b7b02165");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-5636");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(404);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/11/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/11/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/07");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:beckhoff:twincat:2.0:build2304");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:beckhoff:twincat:3.1:build4024.0");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2022-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Beckhoff");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Beckhoff');

var asset = tenable_ot::assets::get(vendor:'Beckhoff');

var vuln_cpes = {
    "cpe:/a:beckhoff:twincat:2.0:build2304" :
        {"versionEndIncluding" : "2.11.2304", "versionStartIncluding" : "2.0", "family" : "BeckhoffCSeries"},
    "cpe:/a:beckhoff:twincat:3.1:build4024" :
        {"versionEndIncluding" : "3.1.4024", "versionStartIncluding" : "3.1", "family" : "BeckhoffCSeries"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);