Nginx 0.7.22 - 1.29.0 Information Disclosure 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:nginx:nginx";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.124888");
  script_version("2025-10-22T05:39:59+0000");
  script_tag(name:"last_modification", value:"2025-10-22 05:39:59 +0000 (Wed, 22 Oct 2025)");
  script_tag(name:"creation_date", value:"2025-08-20 07:48:08 +0000 (Wed, 20 Aug 2025)");
  script_tag(name:"cvss_base", value:"2.6");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:H/Au:N/C:P/I:N/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2025-08-13 15:15:37 +0000 (Wed, 13 Aug 2025)");

  script_cve_id("CVE-2025-53859");

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

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

  script_name("Nginx 0.7.22 - 1.29.0 Information Disclosure Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2025 Greenbone AG");
  script_family("Web Servers");
  script_dependencies("gb_nginx_consolidation.nasl");
  script_mandatory_keys("nginx/detected");

  script_tag(name:"summary", value:"Nginx is prone to an information disclosure vulnerability.");

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

  script_tag(name:"insight", value:"In the ngx_mail_smtp_module that might allow an unauthenticated
  attacker to over-read NGINX SMTP authentication process memory as a result, the server side may
  leak arbitrary bytes sent in a request to the authentication server. This issue happens during
  the NGINX SMTP authentication process and requires the attacker to make preparations against the
  target system to extract the leaked data.");

  script_tag(name:"impact", value:"This vulnerability may allow a remote, unauthenticated attacker
  to cause a leak of arbitrary bytes during the NGINX SMTP authentication process. There is no
  control plane exposure this is a data plane issue only.");

  script_tag(name:"affected", value:"Nginx versions 0.7.22 through 1.29.0.");

  script_tag(name:"solution", value:"Update to version 1.29.1 or later.");

  script_xref(name:"URL", value:"http://nginx.org/en/security_advisories.html");
  script_xref(name:"URL", value:"https://my.f5.com/manage/s/article/K000152786");

  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))
  exit(0);

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

if (version_in_range_exclusive(version: version, test_version_lo: "0.7.22", test_version_up: "1.29.1")) {
  report = report_fixed_ver( installed_version: version, fixed_version: "1.29.1", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);