osTicket setup.php Accessibility

# OpenVAS Vulnerability Test
# $Id: osticket_setup_php_accessible.nasl 6056 2017-05-02 09:02:50Z teissa $
# Description: osTicket setup.php Accessibility
#
# Authors:
# George A. Theall, <[email protected]>
#
# Copyright:
# Copyright (C) 2004 George A. Theall
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# as published by the Free Software Foundation
#
# 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.
#

tag_summary = "The target is running at least one instance of an improperly secured
installation of osTicket and allows access to setup.php.  Since that
script does not require authenticated access, it is possible for an
attacker to modify osTicket's configuration using a specially crafted
call to setup.php to perform the INSTALL actions. 

For example, if config.php is writable, an attacker could change the
database used to store ticket information, even redirecting it to
another site.  Alternatively, regardless of whether config.php is
writable, an attacker could cause the loss of all ticket information by
reinitializing the database given knowledge of its existing
configuration (gained, say, from reading config.php).";

tag_solution = "Remove both setup.php and gpcvar.php and ensure permissions
on config.php are 644.";

if (description) {
  script_id(13647);
  script_version("$Revision: 6056 $");
  script_tag(name:"last_modification", value:"$Date: 2017-05-02 11:02:50 +0200 (Tue, 02 May 2017) $");
  script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
  script_tag(name:"cvss_base", value:"5.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:P");
 
  name = "osTicket setup.php Accessibility";
  script_name(name);
 
 
  summary = "Checks Accessibility of osTicket's setup.php";
 
  script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"remote_vul");
  script_copyright("This script is Copyright (C) 2004 George A. Theall");

  family = "Web application abuses";
  script_family(family);

  script_dependencies("global_settings.nasl", "http_version.nasl", "osticket_detect.nasl");
  script_require_ports("Services/www", 80);

  script_tag(name : "solution" , value : tag_solution);
  script_tag(name : "summary" , value : tag_summary);
  exit(0);
}

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

host = get_host_name();
port = get_http_port(default:80);
if (debug_level) display("debug: searching for setup.php Accessibility vulnerability in osTicket on ", host, ":", port, ".\n");

if (!get_port_state(port)) exit(0);

# Check each installed instance, stopping if we find a vulnerability.
installs = get_kb_list(string("www/", port, "/osticket"));
if (isnull(installs)) exit(0);
foreach install (installs) {
  matches = eregmatch(string:install, pattern:"^(.+) under (/.*)$");
  if (!isnull(matches)) {
    ver = matches[1];
    dir = matches[2];
    if (debug_level) display("debug: checking version ", ver, " under ", dir, ".\n");

    # Get osTicket's setup.php.
    url = string(dir, "/setup.php");
    if (debug_level) display("debug: checking ", url, ".\n");
    req = http_get(item:url, port:port);
    res = http_keepalive_send_recv(port:port, data:req);
    if (res == NULL) exit(0);           # can't connect
    if (debug_level) display("debug: res =>>", res, "<<\n");

    # If successful, there's a problem.
    if (egrep(pattern:"title>osTicket Install", string:res, icase:TRUE)) {
      security_message(port:port);
      exit(0);
    }
  }
}