ELOG < 3.1.4 DoS Vulnerability

# SPDX-FileCopyrightText: 2020 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:elog_project:elog";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.143636");
  script_version("2025-11-06T05:40:15+0000");
  script_tag(name:"last_modification", value:"2025-11-06 05:40:15 +0000 (Thu, 06 Nov 2025)");
  script_tag(name:"creation_date", value:"2020-03-25 07:31:41 +0000 (Wed, 25 Mar 2020)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-03-26 15:50:00 +0000 (Thu, 26 Mar 2020)");

  script_cve_id("CVE-2020-8859");

  script_tag(name:"qod_type", value:"remote_banner");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("ELOG < 3.1.4 DoS Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Denial of Service");
  script_dependencies("gb_elog_http_detect.nasl");
  script_mandatory_keys("elog/detected");

  script_tag(name:"summary", value:"ELOG is prone to a denial of service (DoS) vulnerability.");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"insight", value:"This vulnerability allows remote attackers to create a denial
  of service condition on affected installations of ELOG Electronic Logbook. Authentication is not
  required to exploit this vulnerability. The specific flaw exists within the processing of HTTP
  parameters. A crafted request can trigger the dereference of a null pointer.");

  script_tag(name:"impact", value:"An attacker can leverage this vulnerability to create a denial
  of service condition.");

  script_tag(name:"affected", value:"ELOG prior to version 3.1.4.");

  script_tag(name:"solution", value:"Update to version 3.1.4 or later.");

  script_xref(name:"URL", value:"https://elog.psi.ch/elogs/Forum/69114");
  script_xref(name:"URL", value:"https://www.zerodayinitiative.com/advisories/ZDI-20-252/");

  exit(0);
}

include("host_details.inc");
include("version_func.inc");

if (!port = get_app_port(cpe: CPE))
  exit(0);

if (!version = get_app_version(cpe: CPE, port: port))
  exit(0);

if (version_is_less(version: version, test_version: "3.1.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "3.1.4");
  security_message(port: port, data: report);
  exit(0);
}

exit(99);