[Wargame]ccu Middle ~ Mid04

Middle
Given：

1. 一個看不到目錄內容的目錄
   
2. Nothing ...
   

Thinking:

1. 猜吧...
2. shell的執行檔名稱 ...
   

Mid01
Given：

1. 'less' with setuid
   

Thinking:

1. how to execute a external program by that program
2. man less!!
   

Mid02
太簡單


Mid03
Given：

1. 一堆指令
2. A program with setuid attribute is at ~mid04/bin/myshell
   

Thinking:

1. Restricted-shell. How to escape?? vim??
   

Mid04
Given：

1. A backdoor at??
   
2. The password of backdoor
   

Thinking:

1. 登入後門後，建一個可以讓mid04轉到mid05的setuid程式。