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37 lines
1.3 KiB
Markdown
37 lines
1.3 KiB
Markdown
# 6.1.13 pwn 34C3CTF2017 readme_revenge
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- [题目复现](#题目复现)
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- [题目解析](#题目解析)
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- [参考资料](#参考资料)
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[下载文件](../src/writeup/6.1.13_34c3ctf2017_readme_revenge)
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## 题目复现
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```
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$ file readme_revenge
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readme_revenge: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, for GNU/Linux 2.6.32, BuildID[sha1]=2f27d1b57237d1ab23f8d0fc3cd418994c5b443d, not stripped
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$ checksec -f readme_revenge
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RELRO STACK CANARY NX PIE RPATH RUNPATH FORTIFY Fortified Fortifiable FILE
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Partial RELRO Canary found NX enabled No PIE No RPATH No RUNPATH Yes 3 45 readme_revenge
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```
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与我们经常接触了题目不同，这是一个静态链接程序，运行时不需要加载 libc。not stripped 也为调试提供了便利。
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```
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$ ./readme_revenge
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aaaa
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Hi, aaaa. Bye.
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$ ./readme_revenge
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%x.%d.%p
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Hi, %x.%d.%p. Bye.
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$ python -c 'print "A"*2000' | ./readme_revenge
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Segmentation fault (core dumped)
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```
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我们试着给它输入一些字符，结果被原样打印出来，而且看起来也不存在格式化字符串漏洞。但当我们输入大量字符时，触发了段错误，这倒是一个好消息。
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## 题目解析
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## 参考资料
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https://ctftime.org/task/5135
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