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在 HIT (Hacks In Taiwan) 2007 研討會當中,Kuon 展示了一個已知的 Firefox 弱點同時可以攻擊 Windows, Linux, Mac OS,點醒了大家對跨平台瀏覽器所隱藏的安全性問題。

Firefox 普遍的被認為是較安全的瀏覽器,其開放源碼的特性使得所有人都可以檢視其源碼。而在新版本當中加入自動更新、防釣魚等等安全性功能,也直接的提高 Firefox 的安全性。而 Firefox 另外一個受歡迎的原因,則是因為有許多豐富的擴充套件,讓使用者可以依據自己的需求載入各式各樣不同的擴充套件,達到高度的客制化。如可以在 Firefox 內直接使用 IE 引擎的 IE Tab,可訂閱 RSS Feed 的 Sage RSS Reader,提供滑鼠手勢的 All-in-One Gestures,或者是開發、除錯網頁程式的 Web Devloper、Firebug。眾多不同的擴充套件通常是 Firefox 使用者對其愛不釋手的主要原因。

但眾多由不同開發者所開發的擴充套件卻帶來安全性問題。此次在 HIT 2007 研討會上所展示的漏洞便是利用 Firebug 網頁除錯工具中,其中部份介面使用 HTML 撰寫而非 XUL,攻擊者可透過 Firebug 執行系統中的指令,造成 Cross-zone scripting 弱點。此漏洞影響範圍包含了 Windows, Linux 以及 Mac OS,此漏洞為 2007 年四月的 0day 漏洞,並且已經修補完成。

此一展示點醒了眾人原先對於 Firefox 擴充套件的過於信任。Firebug 在網頁開發者當中是一個相當熱門的擴充套件,但使用者卻忽視了這些擴充套件很有可能造成安全性的問題,這也提醒了我們要更加注意跨平台瀏覽器的安全性問題,這些瀏覽器影響的平台範圍,遠遠超過了僅限於部份平台的瀏覽器。

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