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
""" This module is responsible for managing the wallpaper. """

import platform
import os
import re
import subprocess
from PIL import Image
from pathlib import Path
from random import choice
from urllib.request import urlopen
from uuid import uuid4
from wallauto.reddit import RedditClient
from wallauto.yamlmanager import YamlManger


class WallpaperSetter:
    """ Selects a method to set Wallpaper according
    to the operative system. """

    @classmethod
    def selector(cls, image_path):
        """ Select method according to operative system. """
        system = platform.system().lower()
        if 'linux' in system:
            cls._linux(image_path)
        elif 'win' in system:
            cls._windows(image_path)
        else:
            cls._mac(image_path)

    @staticmethod
    def _linux(image_path):
        """ Method for Linux. """
        desktop = os.environ['XDG_CURRENT_DESKTOP'].lower()
        image_path = Path(image_path).absolute()
        if 'gnome' in desktop:
            subprocess.run([
                'gsettings',
                'set',
                'org.gnome.desktop.background',
                'picture-uri',
                f'file://{str(image_path)}'
            ])

    @staticmethod
    def _mac(image_path):
        """ Method for Mac. """
        subprocess.run([
            'osascript',
            '-e',
            ('\'tell application "Finder" to set desktop picture '
             f'to POSIX file "{str(image_path)}"\'')
        ])

    @staticmethod
    def _windows(image_path):
        """ Method for Windows. """
        # TODO:  <29-12-20, Fernando Cruz> #
        # Check if this command works
        subprocess.run([
            'reg',
            'add',
            r'"HKEY_CURRENT_USER\Control Panel\Desktop"',
            '/v',
            'Wallpaper',
            '/t',
            'REG_SZ',
            '/f',
            '/d',
            f'{str(image_path)}'
        ])
        subprocess.run([
            'RUNDLL32.EXE',
            'user32.dll,',
            'UpdatePerUserSystemParameters'
        ])


class WallpaperBuilder:
    """ Methods to get image from Reddit and set it as wallpaper.  """

    def __init__(self, config_file):
        self.config_file = config_file
        self.config_data = self.get_config_data(config_file)

    def get_config_data(self, config_file):
        """ Get data from config file.
        Params:
            config_file (pathlib.Path | string): path to config_file.
        """
        config_file = Path(config_file)
        return YamlManger(config_file).get()

    def get_reddit_posts(self):
        """ Get image posts from subreddit. """
        client_id = self.config_data['reddit_account']['client_id']
        client_secret = self.config_data['reddit_account']['client_secret']
        user_agent = self.config_data['reddit_account']['user_agent']
        if not client_id or not client_secret or not user_agent:
            raise Exception('Reddit credentials not found.')
        reddit = RedditClient(
            **self.config_data['reddit_account']
        )
        payload = {
            "subreddit": '+'.join(self.config_data['subreddits']),
            "secc": self.config_data['filter'],
            "time_filter": self.config_data['time_filter'],
            "limit": self.config_data['amount_post'],
        }
        try:
            posts = [
                {'title': post.title,
                 'author': post.author.name,
                 'url': post.url}
                for post in reddit.sub(**payload)
                if post.url.lower().endswith('.jpg')
                and 'https://i.redd.it/' in post.url
            ]
            return posts
        except TypeError as e:
            print(e)
            print('Post list is empty, it could be that '
                  'the post filter is not correct.')
            return []

    def get_image_size(self, image_data):
        pattern = r'\[\d\d\d\S[\s\S]*\]'
        sizes = re.search(pattern, image_data['title'])
        if sizes:
            return re.findall(r'\d\d\d\d', sizes.group())
        image_requested = urlopen(image_data['url'])
        pil_image = Image.open(image_requested)
        return pil_image.size

    def save_image(self, image_id, image_data):
        """ Save image data to a DB
        Params:
            image_id (string): id generated by uuid4.
            image_data (dict): {author, title, url}
        """
        width = 0
        heigth = 1
        try:
            width, heigth = self.get_image_size(image_data)
        except ValueError:
            pass
        if width > heigth:
            image_db = Path(self.config_data['image_db'])
            image_db.exists() or image_db.touch()
            image_depot = Path(self.config_data['image_depot'])
            image_path = image_depot / f'{image_id}.jpg'
            db = YamlManger(image_db)
            db_data = db.get()
            try:
                if len(db_data) > 0:
                    for img_info in db_data:
                        if img_info['url'] == image_data['url']:
                            return img_info['path']
            except TypeError:
                db_data = []
            with image_path.open('wb') as img:
                img.write(urlopen(image_data['url']).read())
            db_data.append({
                **image_data,
                'id': image_id,
                'path': str(image_path),
            })
            db.set(db_data)
            return image_path
        else:
            return

    def set_wallpaper(self, image_path):
        """ Set image as a wallpaper on desktop. """
        WallpaperSetter.selector(image_path)


class WallpaperClient:
    data_struture = {
        'image_depot': '',
        'image_db': '',
        'delete_on_change': False,
        'subreddits': ['EarthPorn', 'CityPorn', ],
        'filter': 'top',
        'time_filter': 'all',
        'amount_post': 25,
        'reddit_account': {
            'client_id': '',
            'client_secret': '',
            'user_agent': '',
        }
    }

    @staticmethod
    def get_config_file():
        system = platform.system().lower()
        config_file = None
        if 'win' in system:
            config_file = Path().home().joinpath(
                'AppData', 'Roaming', 'WallpaperAutomater', 'config.yml'
            )
        else:
            config_file = Path().home().joinpath(
                '.config', 'WallpaperAutomater', 'config.yml'
            )
        return config_file

    @classmethod
    def init_conf(cls, force=False):
        """ Creates de initial configuration. """
        config_file = cls.get_config_file()
        image_db = config_file.parent / 'image_db.yml'
        if not image_db.exists() or force:
            image_db.touch()
            cls.data_struture['image_db'] = str(image_db)
        image_depot = Path().home() / 'image_depot'
        if not image_depot.exists() or force:
            try:
                os.makedirs(image_depot)
            except FileExistsError:
                pass
            finally:
                cls.data_struture['image_depot'] = str(image_depot)
        if not config_file.exists() or force:
            try:
                os.makedirs(config_file.parent)
            except FileExistsError:
                pass
            finally:
                config_file.touch()
                YamlManger(config_file).set(cls.data_struture)

    @classmethod
    def wallpaper_random(cls):
        config_file = cls.get_config_file()
        conf_data = YamlManger(config_file).get()
        wallpaper = WallpaperBuilder(config_file)
        posts = wallpaper.get_reddit_posts()
        if len(posts) > 0:
            attemps = 0
            image_id = uuid4().hex
            while True or attemps >= conf_data['amount_post']:
                post = choice(posts)
                image_path = wallpaper.save_image(image_id, post)
                if image_path:
                    wallpaper.set_wallpaper(image_path)
                    return post
                attemps += 1

    @classmethod
    def wallpaper_random_from_depot(cls):
        config_file = cls.get_config_file()
        conf_data = YamlManger(config_file).get()
        image_depot = Path(conf_data['image_db'])
        images_data = YamlManger(image_depot).get()
        image = choice(images_data)
        wallpaper = WallpaperBuilder(config_file)
        wallpaper.set_wallpaper(image['path'])
        return image


if __name__ == "__main__":
    w = WallpaperClient()
    w.init_conf()
    w.wallpaper_random()
    # w.wallpaper_random_from_depot()

```

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

  A) CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
  B) CWE-94: Improper Control of Generation of Code ('Code Injection')
  C) CWE-117: Improper Output Neutralization for Logs
  D) CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
  E) CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  F) CWE-20: Improper Input Validation
Answer: F