Rockwell Automation MicroLogix Controllers and RSLogix 500 Software Use of Hard-Coded Cryptographic Key (CVE-2020-6990)

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

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

if (description)
{
  script_id(500369);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2020-6990");
  script_xref(name:"ICSA", value:"20-070-06");

  script_name(english:"Rockwell Automation MicroLogix Controllers and RSLogix 500 Software Use of Hard-Coded Cryptographic Key (CVE-2020-6990)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Rockwell Automation MicroLogix 1400 Controllers Series B v21.001 and prior, Series A, all versions, MicroLogix 1100
Controller, all versions, RSLogix 500 Software v12.001 and prior, The cryptographic key utilized to help protect the
account password is hard coded into the RSLogix 500 binary file. An attacker could identify cryptographic keys and use
it for further cryptographic attacks that could ultimately lead to a remote attacker gaining unauthorized access to the
controller.  

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://www.us-cert.gov/ics/advisories/icsa-20-070-06");
  # https://www.rockwellautomation.com/en-us/support/advisory.PN1411.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d3665415");
  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.

For MicroLogix 1400 series B controllers, Rockwell recommends affected users apply FRN 21.002 or later for MicroLogix
1400 Series B devices and use the enhanced password security feature.

Rockwell Automation reports that there are currently no mitigations for MicroLogix 1400 series A controllers or
MicroLogix 1100 controllers.

For RSLogix 500 software, Rockwell Automation recommends affected users apply v11 or later and use in conjunction with
applied FRN 21.001 or later for Micrologix 1400 Series B devices. Other configurations do not have direct mitigations.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/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:H/I:H/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-2020-6990");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/03/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/03/16");
  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:rockwellautomation:micrologix_1400_a_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:rockwellautomation:micrologix_1400_b_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:rockwellautomation:micrologix_1100_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/Rockwell");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Rockwell');

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

var vuln_cpes = {
    "cpe:/o:rockwellautomation:micrologix_1400_a_firmware" :
        {"family" : "MicroLogix1400"},
    "cpe:/o:rockwellautomation:micrologix_1400_b_firmware" :
        {"versionEndIncluding" : "21.001", "family" : "MicroLogix1400"},
    "cpe:/o:rockwellautomation:micrologix_1100_firmware" :
        {"family" : "MicroLogix1100"}
};

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