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：

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」。

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:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527

https://www.ithome.com.tw/news/145427

https://kb.cert.org/vuls/id/383432

https://docs.microsoft.com/zh-tw/troubleshoot/windows-server/printing/use-group-policy-to-control-ad-printer

https://thegeekpage.com/how-to-start-stop-or-restart-print-spooler-in-windows-10/

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