Siemens SIMATIC S7-1500 CPU Improper Input Validation (CVE-2018-16558)

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

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

if (description)
{
  script_id(500321);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2018-16558");
  script_xref(name:"ICSA", value:"19-036-04");

  script_name(english:"Siemens SIMATIC S7-1500 CPU Improper Input Validation (CVE-2018-16558)");

  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 S7-1500 CPU (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 CPU (All
versions <= V1.8.5). Specially crafted network packets sent to port 80/tcp or 443/tcp could allow an unauthenticated
remote attacker to cause a Denial-of-Service condition of the device. The security vulnerability could be exploited by
an attacker with network access to the affected systems on port 80/tcp or 443/tcp. Successful exploitation requires no
system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the
device. 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-180635.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-19-036-04");
  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 recommends users upgrade to Version 2.5 or newer. Users who cannot upgrade because of hardware restrictions are
recommended to apply the manual mitigations. Updates are available for download from the following link:

https://support.industry.siemens.com/cs/de/en/view/109478459

Siemens also recommends users apply the following manual mitigations:

- Protect network access to Port 80/tcp and Port 443/tcp of affected devices.
- Apply cell protection concept.
- Apply defense-in-depth.

As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate
mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the
environment according to Siemens’ operational guidelines for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security) and following the recommendations in the
product manuals.

Additional information on industrial security for Siemens devices can be found at: 

https://www.siemens.com/Industrialsecurity

For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens Security
Advisory SSA-180635 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: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-2018-16558");

  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:"2019/04/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/17");
  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_s7-1500_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_s7-1500_firmware:1.8" :
        {"versionEndIncluding" : "1.8.5", "family" : "S71500"},
    "cpe:/o:siemens:simatic_s7-1500_firmware:2.0" :
        {"versionEndExcluding" : "2.5", "versionStartIncluding" : "2.0", "family" : "S71500"}
};

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