https://github.com/phieulang1993/ctf-writeups/tree/master/2018/pragyan/aes_enc_unbfRemote code execution by format string and stack overflow to get shell then steal key + iv
```$ lscoreiv.aeskey.aesx.out$ cat *.aesIV{212&5^V!-!}IVBEGIN-KEY{4x@$^%`w~d##*9}END-KEY```