B&R Automation Runtime Missing Release of Memory after Effective Lifetime (CVE-2020-11637)

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

include('compat.inc');

if (description)
{
  script_id(503268);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/06/13");

  script_cve_id("CVE-2020-11637");

  script_name(english:"B&R Automation Runtime Missing Release of Memory after Effective Lifetime (CVE-2020-11637)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A memory leak in the TFTP service in B&R Automation Runtime versions
<N4.26, <N4.34, <F4.45, <E4.53, <D4.63, <A4.73 and prior could allow
an unauthenticated attacker with network access to cause a denial of
service (DoS) condition.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.br-automation.com/downloads_br_productcatalogue/assets/1595163815396-de-original-1.0.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d2eacb6a");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  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_attribute(attribute:"cvss_score_source", value:"CVE-2020-11637");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(401);

  script_set_attribute(attribute:"vuln_publication_date", value:"2020/10/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/06/13");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:4");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:a4");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:d4");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:e4");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:f4");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:br-automation:automation_runtime:n4");
  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) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/BRAutomation");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/BRAutomation');

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

var vuln_cpes = {
    "cpe:/a:br-automation:automation_runtime:4" :
        {"versionEndIncluding" : "4.10", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:n4" :
        {"versionEndExcluding" : "n4.26", "versionStartIncluding" : "4.20", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:f4" :
        {"versionEndExcluding" : "f4.45", "versionStartIncluding" : "4.40", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:e4" :
        {"versionEndExcluding" : "e4.53", "versionStartIncluding" : "4.50", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:d4" :
        {"versionEndExcluding" : "d4.63", "versionStartIncluding" : "4.60", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:a4" :
        {"versionEndExcluding" : "a4.73", "versionStartIncluding" : "4.70", "family" : "BRAutomation"},
    "cpe:/a:br-automation:automation_runtime:n4" :
        {"versionEndExcluding" : "n4.34", "versionStartIncluding" : "4.30", "family" : "BRAutomation"}
};

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