Welcome to hell

cdpointpoint published on 2023-04-01 included in write-up

#Welcom to Hell Introduction This post is a write-up of a pwn challenge from UMASSCTF 2023. You can discover a nice obfuscation technic using sys_rt_sigreturn syscall. You can find le binary here : welcome_to_hell.zip Discovery Starting, the program wait from some entry. ./welcome_to_hell abcdef # def bash: def: command not found It seem read the 3 first characters submitted. ghidra investigation : We can see some stranges function names. The main is this one :