Created
May 23, 2019 12:21
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SO Aran fey pickle
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| import pickle | |
| winner = False | |
| #data = b'c__builtin__\neval\n(Vprint("Bang! From, Evan.")\ntR.' | |
| data = b'c__builtin__\neval\n(Vexec("winner=True")\ntR.' | |
| pickle.loads(data) | |
| # validate the solution | |
| assert winner, "You didn't toggle the variable" | |
| print('You win!') |
Yeah, pickle supports multiple interfaces that let you customize how your data is pickled. The easiest one to abuse is __reduce__, which literally lets you call an arbitrary (pickleable) function with arbitrary (pickleable) arguments.
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It was that simple? breaks down and starts crying I went through a deep dive of how pickle generates its strings, ending up with an article that implemented a pickle bomb. https://intoli.com/blog/dangerous-pickles/ They talk about a package called pickletools.