add 6.1.20

SUMMARY.md

@@ -142,6 +142,7 @@ GitHub 地址：https://github.com/firmianay/CTF-All-In-One
     * [6.1.17 pwn SECCONCTF2016 jmper](doc/6.1.17_pwn_secconctf2016_jmper.md)
     * [6.1.18 pwn HITBCTF2017 Sentosa](doc/6.1.18_pwn_hitbctf2017_sentosa.md)
     * [6.1.19 pwn HITBCTF2018 gundam](doc/6.1.19_pwn_hitbctf2018_gundam.md)
+    * [6.1.20 pwn 33C3CTF2016 babyfengshui](doc/6.1.20_pwn_33c3ctf2016_babyfengshui.md)
   * re
     * [6.2.1 re XHPCTF2017 dont_panic](doc/6.2.1_re_xhpctf2017_dont_panic.md)
     * [6.2.2 re ECTF2016 tayy](doc/6.2.2_re_ectf2016_tayy.md)

doc/6.1.20_pwn_33c3ctf2016_babyfengshui.md

@@ -0,0 +1,30 @@
+# 6.1.20 pwn 33C3CTF2016 babyfengshui
+
+- [题目复现](#题目复现)
+- [题目解析](#题目解析)
+- [Exploit](#exploit)
+- [参考资料](#参考资料)
+
+
+[下载文件](../src/writeup/6.1.20_pwn_33c3ctf2016_babyfengshui)
+
+## 题目复现
+```
+$ file babyfengshui 
+babyfengshui: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=cecdaee24200fe5bbd3d34b30404961ca49067c6, stripped
+$ checksec -f babyfengshui
+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               3       babyfengshui
+$ strings libc-2.19.so | grep "GNU C"
+GNU C Library (Debian GLIBC 2.19-18+deb8u6) stable release version 2.19, by Roland McGrath et al.
+Compiled by GNU CC version 4.8.4.
+```
+
+
+## 题目解析
+
+## Exploit
+
+## 参考资料
+- https://ctftime.org/task/3282
+- https://github.com/bkth/babyfengshui

doc/6_writeup.md

@@ -20,6 +20,7 @@
   - [6.1.17 pwn SECCONCTF2016 jmper](6.1.17_pwn_secconctf2016_jmper.md)
   - [6.1.18 pwn HITBCTF2017 Sentosa](6.1.18_pwn_hitbctf2017_sentosa.md)
   - [6.1.19 pwn HITBCTF2018 gundam](6.1.19_pwn_hitbctf2018_gundam.md)
+  - [6.1.20 pwn 33C3CTF2016 babyfengshui](6.1.20_pwn_33c3ctf2016_babyfengshui.md)
 - re
   - [6.2.1 re XHPCTF2017 dont_panic](6.2.1_re_xhpctf2017_dont_panic.md)
   - [6.2.2 re ECTF2016 tayy](6.2.2_re_ectf2016_tayy.md)