Discourse < 2.0.0 beta6 Stored XSS Vulnerability

# SPDX-FileCopyrightText: 2018 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

if( description )
{
  script_oid("1.3.6.1.4.1.25623.1.0.112352");
  script_version("2025-04-11T15:45:04+0000");
  script_tag(name:"last_modification", value:"2025-04-11 15:45:04 +0000 (Fri, 11 Apr 2025)");
  script_tag(name:"creation_date", value:"2018-08-08 09:46:25 +0200 (Wed, 08 Aug 2018)");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_name("Discourse < 2.0.0 beta6 Stored XSS Vulnerability");
  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2018 Greenbone AG");
  script_family("Web application abuses");
  script_dependencies("gb_discourse_http_detect.nasl");
  script_mandatory_keys("discourse/detected");

  script_xref(name:"URL", value:"https://hackerone.com/reports/333507");
  script_xref(name:"URL", value:"https://github.com/discourse/discourse/commit/4fb41663b3c7071dc1ef7d92eb3e5a6516dfe3b5");

  script_tag(name:"summary", value:"Discourse is prone to a stored cross-site scripting (XSS) vulnerability.");

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

  script_tag(name:"impact", value:"Successful exploitation would allow an attacker to steal cookies,
  passwords or to run arbitrary code on the victim's browser.");

  script_tag(name:"affected", value:"Discourse before version 2.0.0 beta6.");

  script_tag(name:"solution", value:"Update Discourse to version 2.0.0 beta6 or later.");

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

  exit(0);
}

CPE = "cpe:/a:discourse:discourse";

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 );

vers = infos["version"];

if( version_is_less( version:vers, test_version:"2.0.0" ) ||
    version_in_range( version:vers, test_version:"2.0.0.beta1", test_version2:"2.0.0.beta5" ) ) {
  report = report_fixed_ver( installed_version: vers, fixed_version: "2.0.0.beta6", install_path:infos["location"] );
  security_message( data:report, port:port );
  exit( 0 );
}

exit( 99 );