Mitsubishi Electric MELSEC iQ-R Series Cleartext Transmission of Sensitive Information (CVE-2021-20599)

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

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

if (description)
{
  script_id(500577);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/23");

  script_cve_id("CVE-2021-20599");

  script_name(english:"Mitsubishi Electric MELSEC iQ-R Series Cleartext Transmission of Sensitive Information (CVE-2021-20599)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Authorization bypass through user-controlled key vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU all
versions and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU all versions allows an remote unauthenticated
attacker to login to a target CPU module by obtaining credentials other than password.  

This plugin only works with
Tenable.ot. Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-011_en.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5d0579f8");
  script_set_attribute(attribute:"see_also", value:"https://jvn.jp/vu/JVNVU98578731");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-21-287-03");
  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 prepared the following countermeasures:

- MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU: Firmware versions "27" or later
- MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU: Firmware versions "12" or later

Customers using the affected products and versions may take measures through mitigations and workarounds. Mitsubishi
Electric has released the fixed version as shown above, but updating the product to the fixed version is not available.
Mitsubishi Electric recommends users take the following mitigation measures to minimize risk associated with this
vulnerability:

- 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.
- Use the IP filter function to restrict the accessible IP addresses.

Please refer to the Mitsubishi Electric advisory for further details.');
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  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:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-20599");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(863);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/14");
  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:r08sfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r16sfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r32sfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r120sfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r08psfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r16psfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r32psfcpu_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:mitsubishielectric:r120psfcpu_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/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:r08sfcpu_firmware" :
        {"versionEndIncluding" : "26", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r16sfcpu_firmware" :
        {"versionEndIncluding" : "26", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r32sfcpu_firmware" :
        {"versionEndIncluding" : "26", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r120sfcpu_firmware" :
        {"versionEndIncluding" : "26", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r08psfcpu_firmware" :
        {"versionEndIncluding" : "11", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r16psfcpu_firmware" :
        {"versionEndIncluding" : "11", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r32psfcpu_firmware" :
        {"versionEndIncluding" : "11", "family" : "MELSECiQR"},
    "cpe:/o:mitsubishielectric:r120psfcpu_firmware" :
        {"versionEndIncluding" : "11", "family" : "MELSECiQR"}
};

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