> For the complete documentation index, see [llms.txt](https://firmianay.gitbook.io/ctf-all-in-one/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://firmianay.gitbook.io/ctf-all-in-one/6_writeup/pwn/6.1.12_pwn_n1ctf2018_vote.md).

# 6.1.12 pwn N1CTF2018 vote

* [题目复现](#题目复现)
* [题目解析](#题目解析)
* [漏洞利用](#漏洞利用)
* [参考资料](#参考资料)

[下载文件](https://github.com/firmianay/CTF-All-In-One/blob/master/src/writeup/6.1.12_pwn_n1ctf2018_vote)

## 题目复现

这个题目给了二进制文件和 libc：

```
$ file vote
vote: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=53266adcfdcb7b21a01e9f2a1cb0396b818bfba3, stripped
$ checksec -f vote
RELRO           STACK CANARY      NX            PIE             RPATH      RUNPATH      FORTIFY   Fortified Fortifiable  FILE
Partial RELRO   Canary found      NX enabled    No PIE          No RPATH   No RUNPATH   Yes       0               4       vote
```

看起来就是个堆利用的问题：

```
$ ./vote
0: Create
1: Show
2: Vote
3: Result
4: Cancel
5: Exit
Action:
```

然后就可以把它运行起来了：

```
$ socat tcp4-listen:10001,reuseaddr,fork exec:"env LD_PRELOAD=./libc-2.23.so ./vote" &
```

另外出题人在 github 开源了题目的代码，感兴趣的也可以看一下。

## 题目解析

## 漏洞利用

## 参考资料

* <https://ctftime.org/task/5490>