Language: Python
Label: vulnerable
CWE: CWE-918 \u2014 Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Code:
def config():
    config_disabled = (
            app.config['CONFIG_DISABLE'] or
            not valid_user_session(session))
    if request.method == 'GET':
        return json.dumps(g.user_config.__dict__)
    elif request.method == 'PUT' and not config_disabled:
        if 'name' in request.args:
            config_pkl = os.path.join(
                app.config['CONFIG_PATH'],
                request.args.get('name'))
            session['config'] = (pickle.load(open(config_pkl, 'rb'))
                                 if os.path.exists(config_pkl)
                                 else session['config'])
            return json.dumps(session['config'])
        else:
            return json.dumps({})
    elif not config_disabled:
        config_data = request.form.to_dict()
        if 'url' not in config_data or not config_data['url']:
            config_data['url'] = g.user_config.url

        # Save config by name to allow a user to easily load later
        if 'name' in request.args:
            pickle.dump(
                config_data,
                open(os.path.join(
                    app.config['CONFIG_PATH'],
                    request.args.get('name')), 'wb'))

        session['config'] = config_data
        return redirect(config_data['url'])
    else:
        return redirect(url_for('.index'), code=403)