Siemens EN100 Ethernet Module Improper Restriction of Operations Within the Bounds of a Memory Buffer (CVE-2019-13942)

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

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

if (description)
{
  script_id(500352);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2019-13942");
  script_xref(name:"ICSA", value:"19-344-07");

  script_name(english:"Siemens EN100 Ethernet Module Improper Restriction of Operations Within the Bounds of a Memory Buffer (CVE-2019-13942)");

  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 EN100 Ethernet module DNP3 variant (All versions), EN100 Ethernet module IEC
61850 variant (All versions < V4.37), EN100 Ethernet module IEC104 variant (All versions), EN100 Ethernet module Modbus
TCP variant (All versions), EN100 Ethernet module PROFINET IO variant (All versions). An unauthorized user could exploit
a buffer overflow vulnerability in the webserver. Specially crafted packets sent could cause a Denial-of-Service
condition and if certain conditions are met, the affected devices must be restarted manually to fully recover. 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-418979.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.us-cert.gov/ics/advisories/icsa-19-344-07");
  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 has released updates for several affected products, is working on updates for the remaining affected products,
and recommends specific countermeasures until fixes are available.

- EN100 Ethernet module for IEC 61850: Update to v4.37

For all other affected devices, Siemens recommends users block access to Port 80/TCP and 443/TCP (e.g., with an external
firewall).

Siemens recommends operators check whether appropriate resilient protection measures are in place as the risk of cyber
incidents impacting the grid’s reliability can thus be minimized by virtue of the grid design.

Siemens strongly recommends applying the provided security updates using the corresponding tooling and documented
procedures made available with the product. If supported by the product, an automated means to apply the security
updates across multiple product instances may be used. Siemens strongly recommends prior validation of any security
update before being applied, and supervision by trained staff of the update process in the target environment.

As a general security measure, Siemens strongly recommends protecting network access with appropriate mechanisms (e.g.
firewalls, segmentation, VPN). It is advised to configure the environment according to Siemens’ operational guidelines
in order to run the devices in a protected IT environment.

Recommended security guidelines to Secure Substations can be found at https://www.siemens.com/gridsecurity

For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security
advisory SSA-418979 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-2019-13942");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(119);

  script_set_attribute(attribute:"vuln_publication_date", value:"2019/12/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/12/12");
  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:/o:siemens:en100_ethernet_module_with_firmware_variant_dnp3_tcp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_iec104");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_iec_61850");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_modbus_tcp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_profinet_io");
  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/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:en100_ethernet_module_with_firmware_variant_dnp3_tcp" :
        {"family" : "Siprotec4"},
    "cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_iec104" :
        {"family" : "Siprotec4"},
    "cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_iec_61850" :
        {"versionEndExcluding" : "4.37", "family" : "Siprotec4"},
    "cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_modbus_tcp" :
        {"family" : "Siprotec4"},
    "cpe:/o:siemens:en100_ethernet_module_with_firmware_variant_profinet_io" :
        {"family" : "Siprotec4"}
};

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