Foreman < 2.3.4 Improper Authorization Vulnerability

# SPDX-FileCopyrightText: 2021 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:theforeman:foreman";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.112895");
  script_version("2025-03-20T05:38:32+0000");
  script_tag(name:"last_modification", value:"2025-03-20 05:38:32 +0000 (Thu, 20 Mar 2025)");
  script_tag(name:"creation_date", value:"2021-06-09 13:51:11 +0000 (Wed, 09 Jun 2021)");
  script_tag(name:"cvss_base", value:"3.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:S/C:N/I:P/A:N");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2021-06-10 16:48:00 +0000 (Thu, 10 Jun 2021)");

  script_cve_id("CVE-2021-3469");

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

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

  script_name("Foreman < 2.3.4 Improper Authorization Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2021 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_foreman_http_detect.nasl");
  script_mandatory_keys("foreman/detected");

  script_tag(name:"summary", value:"Foreman is prone to an improper authorization
  vulnerability.");

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

  script_tag(name:"insight", value:"The SmartProxyAuth of the Foreman allows controllers to
  authenticate certain requests based on the client certificate. As Puppet CA will consider subject
  alternative names (SANs) from a certificate along with Common name (CN), Puppet CA will sign the
  certificate with SANs pointing at DNS names of the already existing certificate.");

  script_tag(name:"impact", value:"An authenticated attacker can obtain a new certificate by
  crafting a Certificate Signing Request (CSR) made up with CN & SSNs and will then be able to
  impersonate the foreman-proxy to accept the request.");

  script_tag(name:"affected", value:"Foreman prior to version 2.3.4.");

  script_tag(name:"solution", value:"Update to version 2.3.4 or later.");

  script_xref(name:"URL", value:"https://bugzilla.redhat.com/show_bug.cgi?id=1943630");

  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: "2.3.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "2.3.4", install_path: location);
  security_message(port: port, data: report);
  exit(0);
}

exit(99);