system: You are an expert security code reviewer. You will be shown a source code file along with a multi-select question listing several CWE (Common Weakness Enumeration) categories. Your task is to identify which of the listed CWEs are present in the code.

OUTPUT FORMAT: Respond with the letter(s) of all correct options, sorted alphabetically and comma-separated, wrapped in a single \boxed{...}. Examples: `\boxed{A}` for one correct, `\boxed{A,C}` for two, `\boxed{A,C,E}` for three. Output the boxed answer ONLY -- no explanation, no other text.

user: ```python
# -*- coding: UTF-8 -*-
"""
This module contains variables that do not change during run time. The
idea is to only ever build one source of truth (be it a binary, or package), and
execute that same built thing regardless of the run time environment.
"""
import time
from os import environ
from urllib.parse import urljoin
from collections import namedtuple, OrderedDict

import requests
from requests.exceptions import ConnectionError

VLAB_URL = environ.get('VLAB_URL', 'https://localhost')


def get_encryption_data():
    """Dynamically obtain the Auth token public key and encryption algorithm.

    This function will make an API call to the auth server upon service start up
    when the environment variable ``PRODUCTION`` is set to ``true`` or ``beta``.
    The value of ``beta`` allows for the auth server to use a self-signed TLS cert.
    This function will attempt upwards of 10 times (once every second) to connect
    to the auth server, and raise a RuntimeError if it's unable to connect.
    This makes services more robust upon startup due to the dependence on the
    auth server being ready for API requests.

    :Returns: Tuple

    :Raises: RuntimeError
    """
    if not environ.get('PRODUCTION', False) in ('true', 'beta'):
        # This must be a local dev box
        return "testing", "HS256", "string"
    elif environ.get('PRODUCTION', False) == 'beta':
        # Must be a beta/integration server; so we're using self-signed TLS certs
        verify = False
    elif environ.get('PRODUCTION', False) == 'true':
        verify = True
    # Retries to address race when all services start up at once
    for _ in range(10):
        try:
            resp = requests.get(urljoin(VLAB_URL,'/api/1/auth/key'), verify=verify)
        except ConnectionError:
            time.sleep(1)
        else:
            resp.raise_for_status()
            data = resp.json()
            break
    else:
        error = "Unable to connect to auth server"
        raise RuntimeError(error)
    return data['content']['key'], data['content']['algorithm'], data['content']['format']


PUBLIC_KEY, ALGORITHM, KEY_FORMAT = get_encryption_data()

DEFINED = OrderedDict([
            ('VLAB_URL', VLAB_URL),
            ('AUTH_TOKEN_ALGORITHM', ALGORITHM),
            ('AUTH_TOKEN_PUB_KEY', PUBLIC_KEY),
            ('AUTH_TOKEN_KEY_FORMAT', KEY_FORMAT),
            ('AUTH_TOKEN_ISSUER', VLAB_URL),
            ('AUTH_TOKEN_VERSION', int(environ.get('AUTH_TOKEN_VERSION', 1))),
          ])

Constants = namedtuple('Constants', list(DEFINED.keys()))

# The '*' expands the list, just liked passing a function *args
const = Constants(*list(DEFINED.values()))

```

Which of the following CWE vulnerability categories are present in this code? Multiple options may be correct.

  A) CWE-295: Improper Certificate Validation
  B) CWE-209: Generation of Error Message Containing Sensitive Information
  C) CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  D) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  E) CWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  F) CWE-643: Improper Neutralization of Data within XPath Expressions ('XPath Injection')
Answer: A