Elspec G5 Digital Fault Recorder VsFTPd Service Denial of Service (CVE-2021-30047)

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

include('compat.inc');

if (description)
{
  script_id(502820);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/01/28");

  script_cve_id("CVE-2021-30047");

  script_name(english:"Elspec G5 Digital Fault Recorder VsFTPd Service Denial of Service (CVE-2021-30047)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Outdated vsftpd service with known DoS issue.

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.elspec-ltd.com/support/security-advisories/");
  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: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-2021-30047");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(787);

  script_set_attribute(attribute:"vuln_publication_date", value:"2024/03/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2024/03/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/01/27");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:elspec:elspec-g5");
  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/Elspec");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Elspec');

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

var vuln_cpes = {
    "cpe:/o:elspec:elspec-g5" :
        {"versionEndExcluding" : "1.2.1.12", "versionStartIncluding" : "1.1.4.15", "family" : "G5"}
};

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