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    當前位置: 首頁 > 新聞 > 業界動態
    致命漏洞引發全球互聯網“心臟出血”
    時間:2014-07-17 08:41:31
    文章發布:李陽
    原創作者:未知
    來源:工業和信息化部

    2014年4月7日,OpenSSL發布安全公告,曝光了在OpenSSL 1.0.1-1.0.1f版本中存在的嚴重漏洞(CVE-2014-0160),該漏洞被形象地稱為“HeartBleed”(心臟出血)。由于OpenSSL協議應用廣泛,全球超六成網站可能受影響,此外電子郵件、即時通信和虛擬專網(VPN)也都可能遭受攻擊。我國國內至少約有3萬多網站受影響,包括大型電商網站、銀行網銀系統、第三方支付、淘寶、社交網站等,同時電子郵箱、即時通訊系統也未能幸免。

    一、漏洞分析

    1.協議概述

    OpenSSL是一種開放源碼的、為網絡通信提供安全及數據完整性的一種安全協議,囊括了主要的密碼算法、常用的密鑰和證書封裝管理功能以及 SSL 協議,被廣泛地用于各種網絡應用程序中。

    此次曝光的漏洞與OpenSSL的心跳包(heartbeat)模塊有關。存在該漏洞的版本為OpenSSL 1.0.1-1.0.1f。心跳包是OpenSSL協議中的一個重要模塊,用以在客戶端和服務器間定時通知對方自己的狀態,按照一定的時間間隔發送,類似于心跳,如果在指定時間段內未收到對方響應,則判斷對方已經離線。

    2.漏洞原理

    網站服務器接收到客戶端發送的心跳包后,將其加載至服務器內存中,并生成響應數據發送回客戶端。服務器生成響應數據時,需要利用心跳包起始存儲位置和負載數據長度兩個參數讀取內存數據,其中負載數據長度參數是由客戶端發送的心跳包指定的。但存在該漏洞的服務器缺少對該參數正確性的判斷,黑客可以自行構造大于真實數據長度的非法參數(最大可設置為64KB),導致服務器生成響應數據時,會取出后續內存空間中其他數據,并作為響應數據返回給黑客,從而造成內存信息泄露。

    3.攻擊手段

    黑客可以通過構造特定的心跳包向存在此漏洞的網站發起攻擊,每次讀取服務器內存中的 64KB數據,并不斷迭代獲取內存中的信息,這些信息可能會含有程序源碼、用戶 HTTP原始請求、用戶緩存甚至明文的用戶名密碼等。據研究人員稱,利用該漏洞攻擊某著名電商網站時,嘗試讀取200次內存信息后獲得了40多個用戶名、7個密碼,并用這些密碼,成功登錄了該網站。

    4.修復方法

    漏洞的修復只需在服務器將心跳包數據加載至服務器內存時,增加對數據長度參數的正確性判斷,丟棄長度參數為零或大于真實數據長度的心跳包。目前OpenSSL已完成對代碼的修復,網站服務器需及時升級到OpenSSl 1.0.1g等安全版本。

    二、主要影響

    1.影響范圍超六成網站

    根據英國Netcraft公司2014年4月網站服務器調查,全球約有66%的互聯網活躍網站受影響。這些網站大都采用了基于OpenSSL的Apache和nginx等開源網站服務器。此外,由于OpenSSL用于保護例如電子郵件服務器、聊天服務器、虛擬專網、網絡應用和多種客戶端軟件,所以除網站受影響外,電子郵件、即時通信和虛擬專網(VPN)都遭受嚴重影響。我國國內至少約有3萬多網站受影響,包括大型電商網站、銀行網銀系統、第三方支付、微信、淘寶、社交網站、門戶網站等網站,此外電子郵箱、即時通訊系統也未能幸免。

    2.大量敏感數據可能遭竊

    目前,該漏洞的利用和驗證腳本已經可以被廣泛獲取,幾乎所有的攻擊者都已經擁有了相關資源,同時這一漏洞已經遭到了極為廣泛的探測和嘗試。由于該漏洞允許互聯網上任何人讀取使用存在漏洞的網站服務器內存,用戶修改密碼、發送消息、登錄等請求以及很多操作全部暴露出來,直接導致證書密鑰、用戶名、密碼、即時通信、電子郵件、業務關鍵文檔可能遭竊取。

    3.重要信息系統或受影響

    由于第三方組件、資產所有者、運營者和數據采集與監視控制系統(SCADA)軟件開發者都有可能使用受影響版本的OpenSSL,與國計民生關系密切的重要信息系統可能遭受影響,包括工業控制系統或設備在內的連接互聯網的信息系統和設備都可能遭受攻擊。

    三、各方回應

    1.發布預警

    美國US-CERT于4月7日(北京時間)發布名為“OpenSSL‘心臟出血’漏洞”(OpenSSL“Heartbleed”vulnerability)的預警信息。美國ICS-CERT于4月8日(北京時間)發布名為“關于OpenSSL漏洞的態勢感知預警”(Situational Awareness Alert for OpenSSL Vulnerability)的預警信息。我國CNCERT于4月10日發布名為“關于OpenSSL存在高危漏洞可被利用發起大規模攻擊的情況通報”的預警信息。安全公司奇虎360于4月9日針對“心臟出血”安全漏洞召開新聞發布會。

    2.修復漏洞

    目前,美國蘋果公司、Facebook、雅虎和谷歌已經評估了該漏洞并給關鍵服務打上了補丁。我國阿里巴巴、騰訊、網易、京東等多個大型互聯網服務商通過官微宣布,已經修復了該漏洞。中國金融認證中心(CFCA)稱,由于網銀系統均使用商業級的SSL加密設備,普通用戶可以完全放心使用U盾。


    (工業和信息化部電子科技情報研究所網絡與信息安全研究部)


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