Leak stack variables and libc address from uninitialized buffer, overflow the last read by providing a negative length, rop to system.
[Full writeup here](https://theromanxpl0it.github.io/ctf_hxp2017/2017/11/24/babyish.html)

Original writeup (https://theromanxpl0it.github.io/ctf_hxp2017/2017/11/24/babyish.html).