Siemens SIMATIC S7-300 CPU Improper Input Validation (CVE-2018-16561)

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

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

if (description)
{
  script_id(500219);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2018-16561");
  script_xref(name:"ICSA", value:"19-043-04");

  script_name(english:"Siemens SIMATIC S7-300 CPU Improper Input Validation (CVE-2018-16561)");

  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 CPUs (All versions < V3.X.16). The affected CPUs improperly
validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in
DEFECT mode until manual restart. Successful exploitation requires an attacker to be able to send a specially crafted S7
communication packet to a communication interface of the CPU. This includes Ethernet, PROFIBUS, and Multi Point
Interfaces (MPI). No user interaction or privileges are required to exploit the security vulnerability. The
vulnerability could allow causing a Denial-of-Service condition of the core functionality of the CPU, compromising the
availability of the system. At the time of advisory publication no public exploitation of this security vulnerability
was known. Siemens confirms the security vulnerability and provides mitigations to resolve the security issue.   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-306710.pdf");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-19-043-04");
  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 update to Version 3.X.16, which can be downloaded from the following
link:https://support.industry.siemens.com/cs/ww/en/ps/13752/dlSiemens has identified the following specific workarounds
and mitigations users can apply to reduce the risk:

- Siemens recommends operating the devices only within trusted networks

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
(https://www.siemens.com/cert/operational-guidelines-industrial-security), and following 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 on this vulnerability and associated software updates, please see Siemens security advisory
SSA-306710 on their website: https://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-2018-16561");

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

  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_s7-300_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300f_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300fs_firmware:-");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:simatic_s7-300t_firmware:-");
  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/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_firmware:-" :
        {"versionEndExcluding" : "3.0.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_firmware:3.1" :
        {"versionStartIncluding" : "3.1.0", "versionEndExcluding" : "3.1.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_firmware:3.2" :
        {"versionStartIncluding" : "3.2.0", "versionEndExcluding" : "3.2.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300_firmware:3.3" :
        {"versionStartIncluding" : "3.3.0", "versionEndExcluding" : "3.3.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300f_firmware:-" :
        {"versionEndExcluding" : "3.0.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300f_firmware:3.1" :
        {"versionStartIncluding" : "3.1.0", "versionEndExcluding" : "3.1.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300f_firmware:3.2" :
        {"versionStartIncluding" : "3.2.0", "versionEndExcluding" : "3.2.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300f_firmware:3.3" :
        {"versionStartIncluding" : "3.3.0", "versionEndExcluding" : "3.3.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300fs_firmware:-" :
        {"versionEndExcluding" : "3.0.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300fs_firmware:3.1" :
        {"versionStartIncluding" : "3.1.0", "versionEndExcluding" : "3.1.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300fs_firmware:3.2" :
        {"versionStartIncluding" : "3.2.0", "versionEndExcluding" : "3.2.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300fs_firmware:3.3" :
        {"versionStartIncluding" : "3.3.0", "versionEndExcluding" : "3.3.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300t_firmware:-" :
        {"versionEndExcluding" : "3.0.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300t_firmware:3.1" :
        {"versionStartIncluding" : "3.1.0", "versionEndExcluding" : "3.1.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300t_firmware:3.2" :
        {"versionStartIncluding" : "3.2.0", "versionEndExcluding" : "3.2.16", "family" : "S7300"},
    "cpe:/o:siemens:simatic_s7-300t_firmware:3.3" :
        {"versionStartIncluding" : "3.3.0", "versionEndExcluding" : "3.3.16", "family" : "S7300"}
};

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