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shell_basic1

[Dreamhack] Level2: shell_basic ๐Ÿ›Ž๏ธAccess ์ž…๋ ฅํ•œ ์…ธ์ฝ”๋“œ๋ฅผ ์‹คํ–‰ํ•˜๋Š” ํ”„๋กœ๊ทธ๋žจ์ด ์„œ๋น„์Šค๋กœ ๋“ฑ๋ก๋˜์–ด ์ž‘๋™ํ•˜๊ณ  ์žˆ์Šต๋‹ˆ๋‹ค. main ํ•จ์ˆ˜๊ฐ€ ์•„๋‹Œ ๋‹ค๋ฅธ ํ•จ์ˆ˜๋“ค์€ execve, execveat ์‹œ์Šคํ…œ ์ฝœ์„ ์‚ฌ์šฉํ•˜์ง€ ๋ชปํ•˜๋ฉฐ, ํ’€์ด์™€ ๊ด€๋ จ์ด ์—†์Šต๋‹ˆ๋‹ค. flag ํŒŒ์ผ์˜ ์œ„์น˜์™€ ์ด๋ฆ„์€ /home/shell_basic/flag_name_is_loooooong์ž…๋‹ˆ๋‹ค. ๐Ÿ‘พ Exploit Algorithm & Payload ๋”๋ณด๊ธฐ // Compile: gcc -o shell_basic shell_basic.c -lseccomp // apt install seccomp libseccomp-dev #include #include #include #include #include #include #include #include #include void alarm.. 2023. 8. 22.
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