張貼日期：2021/07/07

【資安漏洞預警】微軟Windows列印多工緩衝處理器(Print Spooler)存在安全漏洞(CVE-2021-34527)，請儘速確認並進行防護補強！

主旨：【資安漏洞預警】微軟Windows列印多工緩衝處理器(Print Spooler)存在安全漏洞(CVE-2021-34527)，允許攻擊者遠端執行任意程式碼，請儘速確認並進行防護補強！

  • 內容說明：
    • 轉發 國家資安資訊分享與分析中心 資安訊息警訊 NISAC-ANA-202107-0236。
    • 研究人員發現Windows列印多工緩衝處理器(Print Spooler)服務內之RpcAddPrinterDriverEx函式因未正確限制非授權之存取行為，導致存在安全漏洞(CVE-2021-34527)，遠端攻擊者可藉由此漏洞進而執行任意程式碼。
  • 影響平台:
    受影響版本如下：
    • Windows 7 for 32-bit Systems Service Pack 1
    • Windows 7 for x64-based Systems Service Pack 1
    • Windows 8.1 for 32-bit systems
    • Windows 8.1 for x64-based systems
    • Windows RT 8.1 Windows 10 for 32-bit Systems
    • Windows 10 for x64-based Systems
    • Windows 10 Version 1607 for 32-bit Systems
    • Windows 10 Version 1607 for x64-based Systems
    • Windows 10 Version 1809 for 32-bit Systems
    • Windows 10 Version 1809 for ARM64-based Systems
    • Windows 10 Version 1809 for x64-based Systems
    • Windows 10 Version 1909 for 32-bit Systems
    • Windows 10 Version 1909 for ARM64-based Systems
    • Windows 10 Version 1909 for x64-based Systems
    • Windows 10 Version 2004 for 32-bit Systems
    • Windows 10 Version 2004 for ARM64-based Systems
    • Windows 10 Version 2004 for x64-based Systems
    • Windows 10 Version 20H2 for 32-bit Systems
    • Windows 10 Version 20H2 for ARM64-based Systems
    • Windows 10 Version 20H2 for x64-based Systems
    • Windows 10 Version 21H1 for 32-bit Systems
    • Windows 10 Version 21H1 for ARM64-based Systems
    • Windows 10 Version 21H1 for x64-based Systems
    • Windows Server 2008 for 32-bit Systems Service Pack 2
    • Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
    • Windows Server 2008 for x64-based Systems Service Pack 2
    • Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
    • Windows Server 2008 R2 for x64-based Systems Service Pack 1
    • Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
    • Windows Server 2012
    • Windows Server 2012 (Server Core installation)
    • Windows Server 2012 R2
    • Windows Server 2012 R2 (Server Core installation)
    • Windows Server 2016
    • Windows Server 2016 (Server Core installation)
    • Windows Server 2019
    • Windows Server 2019 (Server Core installation)
    • Windows Server, version 1909 (Server Core installation)
    • Windows Server, version 2004 (Server Core installation)
    • Windows Server, version 20H2 (Server Core Installation)
  • 建議措施:
    目前微軟官方尚未針對此漏洞釋出更新程式，所有Windows作業系統均受此漏洞影響，請各機關聯絡設備維護廠商或參考以下步驟採取緩解措施，並持續留意更新程式釋出情形：
    1. 透過網域主機派送群組原則物件(GPO)，或在單機電腦上執行「本機群組原則編輯器」(gpedit.msc)，將「電腦設定→系統管理範本→印表機→允許列印多工緩衝處理器接受用戶端連線」設為「已停用」。
    2. 重新開機，或藉由「執行services.msc→在Print Spooler服務上按右鍵→點選重新啟動」以重新啟動Print Spooler服務，以使設定生效。參考網址：https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527
  • 參考資料:
    1. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527
    2. https://www.ithome.com.tw/news/145427
    3. https://kb.cert.org/vuls/id/383432
    4. https://docs.microsoft.com/zh-tw/troubleshoot/windows-server/printing/use-group-policy-to-control-ad-printer
    5. https://thegeekpage.com/how-to-start-stop-or-restart-print-spooler-in-windows-10/

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