Apache HTTP Server 2.4.55 - 2.4.57 DoS Vulnerability - Linux

# SPDX-FileCopyrightText: 2023 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:apache:http_server";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.100290");
  script_version("2024-03-14T05:06:59+0000");
  script_tag(name:"last_modification", value:"2024-03-14 05:06:59 +0000 (Thu, 14 Mar 2024)");
  script_tag(name:"creation_date", value:"2023-10-19 13:20:07 +0000 (Thu, 19 Oct 2023)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  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:"2023-11-01 18:11:00 +0000 (Wed, 01 Nov 2023)");

  script_cve_id("CVE-2023-43622");

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

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

  script_name("Apache HTTP Server 2.4.55 - 2.4.57 DoS Vulnerability - Linux");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2023 Greenbone AG");
  script_family("Web Servers");
  script_dependencies("gb_apache_http_server_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("apache/http_server/detected", "Host/runs_unixoide");

  script_tag(name:"summary", value:"Apache HTTP Server 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:"An attacker, opening a HTTP/2 connection with an initial
  window size of 0, was able to block handling of that connection indefinitely in Apache HTTP
  Server. This could be used to exhaust worker resources in the server, similar to the well known
  'slow loris' attack pattern.");

  script_tag(name:"affected", value:"Apache HTTP Server version 2.4.55 through 2.4.57.");

  script_tag(name:"solution", value:"Update to version 2.4.58 or later.");

  # nb: As of 10/2023 the oss-security mailing list posting has more exact affected ranges.
  script_xref(name:"URL", value:"https://httpd.apache.org/security/vulnerabilities_24.html#2.4.58");
  script_xref(name:"URL", value:"https://www.openwall.com/lists/oss-security/2023/10/19/5");

  exit(0);
}

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

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

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE,
                                          version_regex: "^[0-9]+\.[0-9]+\.[0-9]+"))
  exit(0);

version = infos["version"];
location = infos["location"];

if (version_in_range(version: version, test_version: "2.4.55", test_version2: "2.4.57")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.4.58", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);