Siemens SIMATIC TDC CP51M1 Improper Input Validation (CVE-2019-10937)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501640);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/04");

  script_cve_id("CVE-2019-10937");

  script_name(english:"Siemens SIMATIC TDC CP51M1 Improper Input Validation (CVE-2019-10937)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability has been identified in SIMATIC TDC CP51M1 (All
versions < V1.1.7). An attacker with network access to the device
could cause a Denial-of-Service condition by sending a specially
crafted UDP packet. The vulnerability affects the UDP communication of
the device. The security vulnerability could be exploited without
authentication. No user interaction is required to exploit this
security vulnerability. Successful exploitation of the security
vulnerability compromises availability of the targeted system. At the
time of advisory publication no public exploitation of this security
vulnerability was known.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/pdf/ssa-250618.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.us-cert.gov/ics/advisories/icsa-19-253-05");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.

Siemens recommends users update to Version 1.1.7 or later. Updates can be obtained at the following link:

https://support.industry.siemens.com/cs/ww/en/view/27049282

Siemens has identified the following specific workarounds and mitigations that users may apply to reduce the risk:

- Restrict network access to affected devices
- Restrict UDP communication to affected devices
- Do not use UDP communication in the user program if not needed
- Apply cell protection concept and implement defense in depth

As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate
mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the
environment according to Siemens’ operational guidelines for industrial security (download:
https://www.siemens.com/cert/operational-guidelines-industrial-security), and follow the recommendations in the product
manuals. Additional information on industrial security by Siemens can be found at:

https://www.siemens.com/industrialsecurity

For more information, please see Siemens Security Advisory SSA-250618 at the following location:

http://www.siemens.com/cert/advisories");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-10937");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/09/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/09/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/14");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_tdc_cp51m1_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

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

var vuln_cpes = {
    "cpe:/o:siemens:simatic_tdc_cp51m1_firmware" :
        {"versionEndExcluding" : "1.1.7", "family" : "TDCCP51m1"}
};

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