Mitsubishi Electric MELSEC iQ-R Series Uncontrolled Resource Consumption (CVE-2020-5666)

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

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

if (description)
{
  script_id(500495);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2020-5666");
  script_xref(name:"ICSA", value:"20-317-01");

  script_name(english:"Mitsubishi Electric MELSEC iQ-R Series Uncontrolled Resource Consumption (CVE-2020-5666)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU Firmware versions from
'05' to '19' and R04/08/16/32/120(EN)CPU Firmware versions from '35' to '51') allows a remote attacker to cause an error
in a CPU unit via a specially crafted HTTP packet, which may lead to a denial-of-service (DoS) condition in execution of
the program and its communication.  

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://jvn.jp/jp/JVN44764844/index.html");
  script_set_attribute(attribute:"see_also", value:"https://jvn.jp/en/jp/JVN44764844/index.html");
  # https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?be987ec8");
  script_set_attribute(attribute:"see_also", value:"https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01");
  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.

Mitsubishi Electric has issued the following firmware versions to address this issue:

- R00/01/02CPU firmware Versions 20 or later
- R04/08/16/32/120(EN)CPU firmware Versions 52 or later

Mitsubishi Electric also recommends the following practices:

- If the web server function is not needed, change the setting for "To Use or Not to Use Web Server” to “Not Use.”
- Use a firewall or virtual private network (VPN), etc., to prevent unauthorized access when Internet access is
required.
- Use within a trusted LAN and block access from untrusted networks and hosts through firewall.

For more information about this vulnerability and the associated mitigations, please see the vulnerability information
on the Mitsubishi website.');
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/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-2020-5666");

  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:"2020/11/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/11/16");
  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:mitsubishielectric:melsec_iq-r00_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r01_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r02_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r04_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r16_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r08_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r32_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:melsec_iq-r120_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/Mitsubishi");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Mitsubishi');

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

var vuln_cpes = {
    "cpe:/o:mitsubishielectric:melsec_iq-r00_firmware" :
        {"versionEndIncluding" : "19", "versionStartIncluding" : "05", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r01_firmware" :
        {"versionEndIncluding" : "19", "versionStartIncluding" : "05", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r02_firmware" :
        {"versionEndIncluding" : "19", "versionStartIncluding" : "05", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r04_firmware" :
        {"versionEndIncluding" : "51", "versionStartIncluding" : "35", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r16_firmware" :
        {"versionEndIncluding" : "51", "versionStartIncluding" : "35", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r08_firmware" :
        {"versionEndIncluding" : "51", "versionStartIncluding" : "35", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r32_firmware" :
        {"versionEndIncluding" : "51", "versionStartIncluding" : "35", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:melsec_iq-r120_firmware" :
        {"versionEndIncluding" : "51", "versionStartIncluding" : "35", "family" : "MELSECiQR"}
};

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