前天公布的 JailbreakME 2.0 其實是運用了 iOS4 一個 PDF 的漏洞，當手機想顯示 PDF 文件時會錯誤地執行了其他程式碼。不單逃過 iOS4 所有防禦限制，更神不知鬼不覺地在背後執行。要防範這個漏動，Jailbreak 後的用可以進 Cydia 搜尋 PDF Loading Warner，安裝後每次當執行 PDF 內的程式時就會 POP 出警句字句，防止駭客殖入惡意程式。安裝後可以再到 Jailbreakme.com 網站測試，一滑動 Slide Bar 就會彈上圖中的警告了。
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