6.1.12 pwn N1CTF2018 vote

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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

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