Patched code sample

import base64
import os
import sys
import tempfile
import importlib.util
from flask import Flask, request

# This file represents a hypothetical 'ai/sandbox/wsgi_app.py' after being
# patched for CVE-2026-33057.

# In a real-world scenario, this would likely integrate with the Mesop framework's
# core components, but for demonstrating the fix, a minimal app is sufficient.
app = Flask(__name__)


@app.route("/")
def index():
    """
    A safe, example endpoint that might exist in the debugging server.
    """
    return "Mesop AI sandbox server is running."


# --- VULNERABILITY FIX ---
# The vulnerability described in CVE-2026-33057 was located in an '/exec-py'
# endpoint in this file in versions 1.2.2 and below.
#
# The vulnerable endpoint accepted base64-encoded Python code from a POST
# request and executed it without any authentication or sandboxing, leading to
# Remote Code Execution (RCE).
#
# THE FIX:
# The fix for this high-severity vulnerability is the complete removal of the
# dangerous '/exec-py' endpoint. By removing the code block that defined this
# route, there is no longer a web-accessible mechanism for an unauthenticated
# user to remotely execute arbitrary code on the host machine.
#
# The vulnerable code block, which is now DELETED from this file, would have
# looked conceptually similar to the following:
#
# """
# @app.route("/exec-py", methods=["POST"])
# def exec_py_vulnerable():
#     # 1. Get untrusted, base64-encoded code from the request.
#     encoded_code = request.form.get("code")
#     if not encoded_code:
#         return "Missing 'code' parameter", 400
#
#     try:
#         # 2. Decode the Python code.
#         python_code = base64.b64decode(encoded_code).decode("utf-8")
#
#         # 3. Write it to a temporary file on the host machine.
#         with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as tmp:
#             tmp.write(python_code)
#             module_path = tmp.name
#
#         # 4. DANGEROUS: Execute the untrusted code with host-level privileges.
#         spec = importlib.util.spec_from_file_location("temp_module", module_path)
#         module = importlib.util.module_from_spec(spec)
#         spec.loader.exec_module(module)
#
#         os.remove(module_path) # Clean up the file.
#         return "Execution successful", 200
#
#     except Exception as e:
#         return f"An error occurred: {e}", 500
# """
#
# This endpoint and its associated logic are no longer present in the fixed
# version of the application (e.g., version 1.2.3 and later).
# -------------------------


# Other non-vulnerable application routes and logic would be defined below.
# For example, a simple health check endpoint.
@app.route("/health")
def health_check():
    """
    A simple, safe health check endpoint.
    """
    return {"status": "ok"}, 200

# The 'app' object serves as the WSGI application entry point for servers
# like Gunicorn or uWSGI.