# Insecure deserialization Lab5

這題使用序列化的會話機制，並載入 Apache Commons Collections 庫，沒有原始程式碼訪問許可權，但可以使用預構建的小工具鏈來利用。

若要解決問題，要使用第三方工具生成包含遠端代碼執行有效負載的惡意序列化物件，然後將此對象傳遞到網站中，以從 Carlos 的主目錄中刪除 `morale.txt`。

帳密：`wiener:peter`

一樣先進入網站並登入。


這裡先下載 ysoserial，或者直接下載編譯好的 jar。

wget https://github.com/frohoff/ysoserial/releases/download/v0.0.6/ysoserial-all.jar

或直接下載編譯好的 jar：


拿去解碼後可以得到一串格式。

O:4:"User":2:{s:8:"username";s:6:"wiener";s:12:"access_token";s:32:"oine460u1gojmadft2oig9yn1s505xk6";}

不過我們也不知道他要用什麼方式來刪除目標資料，所以這裡我們翻一下他再載入頁面的同時有附什麼檔案，結果這裡有一個 php。


因此在後面加一個 `~` 來看看能不能讀取檔案內容，這時可以看到刪除資料的參數該怎麼使用。


`__destruct()` 方法確認會調用 `unlink($this->lock_file_path)`，現在就來改移下內容：

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