Challenge download link (PS: libc was provided for this challenge)
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Challenge: babyheap libc
Writeup for execve sandbox (pwn, 283 pts, 23 solves), Google CTF Qualifier 2018, by LevitatingLion
Challenge: Cat Chat
Writeup for hardened_flag_store (pwn, 300 + 20 pts, 15 solves), hxp CTF 2017