Ruby on Rails < 5.0.1 RCE Vulnerability

# SPDX-FileCopyrightText: 2020 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:rubyonrails:rails";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113718");
  script_version("2025-09-09T05:38:49+0000");
  script_tag(name:"last_modification", value:"2025-09-09 05:38:49 +0000 (Tue, 09 Sep 2025)");
  script_tag(name:"creation_date", value:"2020-07-06 10:24:47 +0000 (Mon, 06 Jul 2020)");
  script_tag(name:"cvss_base", value:"6.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_tag(name:"severity_vector", value:"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2020-07-27 21:15:00 +0000 (Mon, 27 Jul 2020)");

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

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

  script_cve_id("CVE-2020-8163");

  script_name("Ruby on Rails < 5.0.1 RCE Vulnerability");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2020 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_rails_consolidation.nasl", "os_detection.nasl");
  script_mandatory_keys("rails/detected", "Host/runs_windows");

  script_tag(name:"summary", value:"Ruby on Rails is prone to a remote code execution (RCE) vulnerability.");

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

  script_tag(name:"insight", value:"An attacker may exploit this vulnerability by
  sending a specially crafted 'render' call.");

  script_tag(name:"impact", value:"Successful exploitation would allow an attacker
  to execute arbitrary code on the target machine.");

  script_tag(name:"affected", value:"Ruby on Rails through version 5.0.0.");

  script_tag(name:"solution", value:"Update to version 5.0.1 or later.");

  script_xref(name:"URL", value:"https://hackerone.com/reports/304805");

  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_is_less( version: version, test_version: "5.0.1" ) ) {
  report = report_fixed_ver( installed_version: version, fixed_version: "5.0.1", install_path: location );
  security_message( port: port, data: report );
  exit( 0 );
}

exit( 99 );