Apache HTTP Server 2.4.17 - 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("1.3.6.1.4.1.25623.1.0.100310");
  script_version("2024-08-02T05:05:39+0000");
  script_tag(name:"last_modification", value:"2024-08-02 05:05:39 +0000 (Fri, 02 Aug 2024)");
  script_tag(name:"creation_date", value:"2023-10-19 13:20:07 +0000 (Thu, 19 Oct 2023)");
  script_tag(name:"cvss_base", value:"5.4");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:N/I:N/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/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 17:48:00 +0000 (Wed, 01 Nov 2023)");

  script_cve_id("CVE-2023-45802");

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

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

  script_name("Apache HTTP Server 2.4.17 - 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:"When a HTTP/2 stream was reset (RST frame) by a client, there
  was a time window were the request's memory resources were not reclaimed immediately. Instead,
  de-allocation was deferred to connection close. A client could send new requests and resets,
  keeping the connection busy and open and causing the memory footprint to keep on growing. On
  connection close, all resources were reclaimed, but the process might run out of memory before
  that.

  This was found by the reporter during testing of CVE-2023-44487 (HTTP/2 Rapid Reset Exploit) with
  their own test client. During 'normal' HTTP/2 use, the probability to hit this bug is very low.
  The kept memory would not become noticeable before the connection closes or times out.");

  script_tag(name:"affected", value:"Apache HTTP Server version 2.4.17 through 2.4.57.");

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

  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/2023/10/19/6");
  script_xref(name:"URL", value:"https://github.com/icing/blog/blob/main/h2-rapid-reset.md");

  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: "2.4.17", 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);