Mitsubishi Electric MELSEC iQ-R Series Insufficiently Protected Credentials (CVE-2021-20597)

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

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

if (description)
{
  script_id(500550);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/25");

  script_cve_id("CVE-2021-20597");

  script_name(english:"Mitsubishi Electric MELSEC iQ-R Series Insufficiently Protected Credentials (CVE-2021-20597)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules
(R08/16/32/120SFCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to login to
the target unauthorizedly by sniffing network traffic and obtaining credentials when registering user information in the
target or changing a password.  

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/JVNVU98578731/index.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-21-250-01");
  # https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-009_en.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?793f9b44");
  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.

Users of the affected products and versions may take measures through mitigations and workarounds. Mitsubishi Electric
has released the fixed versions for CVE-2021-20594 and CVE-2021-20597 as shown below, but updating the product to the
fixed version is not available.

- 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

Mitsubishi Electric recommends users take the following mitigation measures to minimize the risk of exploiting these
vulnerabilities:

- Use a firewall or virtual private network (VPN), etc. 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. MELSEC iQ-R Ethernet User\'s Manual (Application)
1.13 Security "IP filter"
- Register user information or change the password via USB. If you have already registered user information or changed
the user\'s password via the network, change the password once via USB. This mitigation is applicable to CVE-2021-20597

Additional information about these vulnerabilities or Mitsubishi Electric\'s compensating control is available by
contacting a Mitsubishi Electric representative.

Users should refer to Mitsubishi Electric advisories 2021-008,2021-009, and 2021-010 for further details.');
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/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:H/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-2021-20597");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(522);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/08/06");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/08/06");
  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);