Contao CMS Cross-Site Scripting Vulnerability

# SPDX-FileCopyrightText: 2011 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("1.3.6.1.4.1.25623.1.0.103352");
  script_cve_id("CVE-2011-4335");
  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_version("2023-12-13T05:05:23+0000");

  script_name("Contao CMS Cross-Site Scripting Vulnerability");

  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/50061");
  script_xref(name:"URL", value:"http://dev.contao.org/projects/typolight/repository/revisions/1041");
  script_xref(name:"URL", value:"http://www.securityfocus.com/archive/1/520046");
  script_xref(name:"URL", value:"http://www.rul3z.de/advisories/SSCHADV2011-025.txt");
  script_tag(name:"last_modification", value:"2023-12-13 05:05:23 +0000 (Wed, 13 Dec 2023)");
  script_tag(name:"creation_date", value:"2011-12-02 11:09:47 +0100 (Fri, 02 Dec 2011)");

  script_tag(name:"qod_type", value:"remote_analysis");
  script_category(ACT_ATTACK);
  script_family("Web application abuses");
  script_copyright("Copyright (C) 2011 Greenbone AG");
  script_dependencies("find_service.nasl", "no404.nasl", "webmirror.nasl", "DDI_Directory_Scanner.nasl", "gb_php_http_detect.nasl", "global_settings.nasl");
  script_require_ports("Services/www", 80);
  script_exclude_keys("Settings/disable_cgi_scanning");

  script_tag(name:"solution", value:"Vendor updates are available. Please see the references for details.");

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

  script_tag(name:"summary", value:"Contao is prone to a cross-site scripting vulnerability because it
  fails to properly sanitize user-supplied input.");

  script_tag(name:"impact", value:"An attacker may leverage this issue to execute arbitrary script code
  in the browser of an unsuspecting user in the context of the affected site. This may allow the attacker
  to steal cookie-based authentication credentials and to launch other attacks.");

  script_tag(name:"affected", value:"Contao 2.10.1 is vulnerable. Other versions may also be affected.");

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("port_service_func.inc");
include("list_array_func.inc");
include("host_details.inc");
include("misc_func.inc");

port = http_get_port(default:80);
if(!http_can_host_php(port:port))exit(0);

vt_strings = get_vt_strings();

foreach dir( make_list_unique( "/contao", "/cms", http_cgi_dirs( port:port ) ) ) {

  if( dir == "/" ) dir = "";
  buf = http_get_cache(item:dir + "/", port:port);
  if(!buf || buf !~ "^HTTP/1\.[01] 200" || ("teachers.html" >!< buf && "academy.html" >!< buf))
    continue;

  url = string(dir,'/index.php/teachers.html?"/><script>alert(/', vt_strings["lowercase"], '/)</script>');

  if(http_vuln_check(port:port, url:url, pattern:"<script>alert\(/" + vt_strings["lowercase"] + "/\)</script>", extra_check:"This website is powered by Contao", check_header:TRUE ) ) {
    report = http_report_vuln_url( port:port, url:url );
    security_message( port:port, data:report );
    exit( 0 );
  }
}

exit( 99 );