Nazgul Nostromo nhttpd < 2.1 Path Traversal Vulnerability

# SPDX-FileCopyrightText: 2025 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:nazgul:nostromo_nhttpd";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.119024");
  script_version("2025-06-06T05:41:39+0000");
  script_tag(name:"last_modification", value:"2025-06-06 05:41:39 +0000 (Fri, 06 Jun 2025)");
  script_tag(name:"creation_date", value:"2025-06-05 10:28:11 +0000 (Thu, 05 Jun 2025)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2023-01-20 19:20:27 +0000 (Fri, 20 Jan 2023)");

  script_cve_id("CVE-2022-48253");

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

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

  script_name("Nazgul Nostromo nhttpd < 2.1 Path Traversal Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Web Servers");
  script_dependencies("gb_nazgul_nostromo_nhttpd_http_detect.nasl");
  script_mandatory_keys("nazgul/nostromo_nhttpd/detected");

  script_tag(name:"summary", value:"Nazgul Nostromo nhttpd is prone to a path traversal
  vulnerability.");

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

  script_tag(name:"insight", value:"If nostromo runs non-chrooted, and with the 'homedirs'
  configuration option enabled (disabled by default), an attacker can exploit a vulnerability to
  access files or execute programs (as CGI) outside of the server root directory. For that a
  specific request URL needs to be crafted by the attacker.");

  script_tag(name:"affected", value:"Nazgul Nostromo nhttpd prior to version 2.1. All of the
  following prerequisites needs to be fulfilled for being affected:

  - the product runs non-chrooted

  - the 'homedirs' configuration option needs to be enabled (disabled by default)");

  script_tag(name:"solution", value:"Update to version 2.1 or later.

  Note: Please create an override for this result if updating is not possible and the risk is
  accepted that the earlier mentioned prerequisites are not applying in the future.");

  script_xref(name:"URL", value:"https://www.soteritsecurity.com/blog/2023/01/nostromo_from_directory_traversal_to_RCE.html");
  script_xref(name:"URL", value:"https://www.nazgul.ch/dev/nostromo_cl.txt");

  exit(0);
}

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

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

if (!infos = get_app_version_and_location(cpe: CPE, port: port, exit_no_version: TRUE))
  exit(0);

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

if (version_is_less(version: version, test_version: "2.1")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);