$ cat writeup.md…
$ cat writeup.md…
tamuctf
Task: Python jail with strictly decreasing \w+ token lengths, empty builtins, banned +-*/=. Solution: Access builtins via __reduce_ex__(2)[0].__builtins__, construct numbers with string comparisons, pad module name for decreasing order, spawn shell with os.system('sh').
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$sign in$ grep --similar