Siemens SIMATIC S7-300 CPUs and SINUMERIK Controller Uncontrolled Resource Consumption (CVE-2020-15783)

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

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

if (description)
{
  script_id(500462);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2020-15783");
  script_xref(name:"ICSA", value:"20-315-04");

  script_name(english:"Siemens SIMATIC S7-300 CPUs and SINUMERIK Controller Uncontrolled Resource Consumption (CVE-2020-15783)");

  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 S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All
versions), SIMATIC TDC CPU555 (All versions), SINUMERIK 840D sl (All versions). Sending multiple specially crafted
packets to the affected devices could cause a Denial-of-Service on port 102. A cold restart is required to recover the
service.  

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-492828.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-20-315-04");
  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 is preparing updates and recommends users protect network access to Port 102/TCP of affected devices.

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 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 additional information, please refer to Siemens Security Advisory SSA-492828");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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-2020-15783");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(400);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/11/12");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/12");
  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:simatic_s7-300_cpu_312_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_314_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_315-2_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_315-2_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_317-2_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_317-2_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_315f-2_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_315f-2_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_317f-2_pn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300_cpu_317f-2_dp_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_tdc_cpu555_firmware");
  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:simatic_s7-300_cpu_312_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_314_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_315-2_dp_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_315-2_pn_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_317-2_pn_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_317-2_dp_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_315f-2_dp_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_315f-2_pn_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_317f-2_pn_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_cpu_317f-2_dp_firmware" :
        {"family" : "S7300"},
    "cpe:/o:siemens:simatic_tdc_cpu555_firmware" :
        {"family" : "TDCCPU555"}
};

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