Create caas.md

Author: brian09088

Web Exploitation/caas.md

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+- 打開網頁
+- 發現後面加上cosways/任意訊息
+- 執行網頁發現如下
+- ![image](https://github.com/brian09088/picoCTF/assets/72643996/63990f94-5620-433c-97b8-2e81f045691e)
+- 透過後面加上;ls，列出以下檔案
+- 猜測藏在falg.txt中
+- 之後更改網址
+- https://caas.mars.picoctf.net/cowsay/123%20;%20cat%20falg.txt
+- ![image](https://github.com/brian09088/picoCTF/assets/72643996/ed717e0a-04a0-4426-9d25-48860b439300)
+- flag : picoCTF{moooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo0o}