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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。