Mitsubishi Electric MELSEC-F Series Lack of Administrator Control Over Security (CVE-2021-20612)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501188);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/03/04");

  script_cve_id("CVE-2021-20612");

  script_name(english:"Mitsubishi Electric MELSEC-F Series Lack of Administrator Control Over Security (CVE-2021-20612)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Lack of administrator control over security vulnerability in MELSEC-F
series FX3U-ENET Firmware version 1.14 and prior, FX3U-ENET-L Firmware
version 1.14 and prior and FX3U-ENET-P502 Firmware version 1.14 and
prior allows a remote unauthenticated attacker to cause a denial-of-
service (DoS) condition in communication function of the product or
other unspecified effects by sending specially crafted packets to an
unnecessary opening of TCP port. Control by MELSEC-F series PLC is not
affected by this vulnerability, but system reset is required for
recovery.

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/vu/JVNVU93268332/index.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/uscert/ics/advisories/icsa-22-013-01");
  # https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-023_en.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?da3ffa29");
  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 corrected this vulnerability in the following products and versions:

- FX3U-ENET: Firmware Version 1.16 or later
- FX3U-ENET-L: Firmware Version 1.16 or later
- FX3U-ENET-P502: Firmware Version 1.16 or later

Mitsubishi Electric recommends users to take the following mitigations:

- Use a firewall or virtual private network (VPN) to prevent unauthorized access when Internet access is required.
- Use within a LAN and block access from untrusted networks and hosts through firewalls.

Please contact Mitsubishi Electric Support for assistance and review the Mitsubishi Electric security advisory for more
information about this issue.");
  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-2021-20612");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(798);

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/01/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/01/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/06/12");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:fx3u-enet-l_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:fx3u-enet-p502_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:fx3u-enet_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2023-2024 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:fx3u-enet_firmware" :
        {"versionEndIncluding" : "1.14", "family" : "MELSECFCP"},
    "cpe:/o:mitsubishielectric:fx3u-enet-l_firmware" :
        {"versionEndIncluding" : "1.14", "family" : "MELSECFCP"},
    "cpe:/o:mitsubishielectric:fx3u-enet-p502_firmware" :
        {"versionEndIncluding" : "1.14", "family" : "MELSECFCP"}
};

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