Rockwell Automation 1794-AENT Flex I/O Series B Buffer Copy Without Checking Size of Input (CVE-2020-6087)

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

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

if (description)
{
  script_id(500475);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/09/04");

  script_cve_id("CVE-2020-6087");
  script_xref(name:"ICSA", value:"20-294-01");

  script_name(english:"Rockwell Automation 1794-AENT Flex I/O Series B Buffer Copy Without Checking Size of Input (CVE-2020-6087)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"An exploitable denial of service vulnerability exists in the ENIP Request Path Data Segment functionality of Allen-
Bradley Flex IO 1794-AENT/B. A specially crafted network request can cause a loss of communications with the device
resulting in denial-of-service. An attacker can send a malicious packet to trigger this vulnerability If the ANSI
Extended Symbol Segment Sub-Type is supplied, the device treats the byte following as the Data Size in words. When this
value represents a size greater than what remains in the packet data, the device enters a fault state where
communication with the device is lost and a physical power cycle is required.  

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://talosintelligence.com/vulnerability_reports/TALOS-2020-1007");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-20-294-01");
  # https://www.rockwellautomation.com/en-us/support/advisory.PN1531.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6c07952c");
  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.

Rockwell Automation recommends affected users ensure they are employing proper network segmentation and security
controls when implementing the affected product.

For more information please see the Rockwell Automation Security Advisory (login required).");
  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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-6087");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(120);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/14");
  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:rockwellautomation:flex_i%2fo_1794-aent%2fb_firmware:4.003");
  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:flex_i%2fo_1794-aent%2fb_firmware:4.003" :
        {"versionEndIncluding" : "4.003", "versionStartIncluding" : "4.003", "family" : "FlexLogix"}
};

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