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[內容說明:]

轉發 行政院國家資通安全會報技術服務中心 資安訊息警訊 NISAC-ANA-202102-0902

研究人員發現微軟Windows TCP/IP存在安全漏洞 CVE-2021-24074、CVE-2021-24094及CVE-2021-24086，可能遭受以下攻擊：

1. 遠端攻擊者可發送特製封包，利用CVE-2021-24074或CVE-2021-24094執行任意程式碼。

2. 遠端攻擊者可發送特製封包，利用CVE-2021-24086造成服務阻斷。

 情資分享等級: WHITE(情資內容為可公開揭露之資訊)

[影響平台:]

受影響之Windows作業系統包含用戶端及伺服器版本，版本如下:

Windows Server, version 20H2 (Server Core Installation)

Windows 10 Version 20H2 for ARM64-based Systems

Windows 10 Version 20H2 for 32-bit Systems

Windows 10 Version 20H2 for x64-based Systems

Windows Server, version 2004 (Server Core installation)

Windows 10 Version 2004 for x64-based Systems

Windows 10 Version 2004 for ARM64-based Systems

Windows 10 Version 2004 for 32-bit Systems

Windows Server, version 1909 (Server Core installation)

Windows 10 Version 1909 for ARM64-based Systems

Windows 10 Version 1909 for x64-based Systems

Windows 10 Version 1909 for 32-bit Systems

Windows Server 2012 R2 (Server Core installation)

Windows Server 2012 R2 Windows Server 2012 (Server Core installation)

Windows Server 2012 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)

Windows Server 2008 R2 for x64-based Systems Service Pack 1

Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)

Windows Server 2008 for x64-based Systems Service Pack 2

Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)

Windows Server 2008 for 32-bit Systems Service Pack 2

Windows RT 8.1 Windows 8.1 for x64-based systems

Windows 8.1 for 32-bit systems Windows 7 for x64-based Systems Service Pack 1

Windows 7 for 32-bit Systems Service Pack 1 Windows Server 2016 (Server Core installation)

Windows Server 2016 Windows 10 Version 1607 for x64-based Systems

Windows 10 Version 1607 for 32-bit Systems Windows 10 for x64-based Systems

Windows 10 for 32-bit Systems Windows Server 2019 (Server Core installation)

Windows Server 2019 Windows 10 Version 1809 for ARM64-based Systems

Windows 10 Version 1809 for x64-based Systems

Windows 10 Version 1809 for 32-bit Systems

Windows 10 Version 1803 for ARM64-based Systems

Windows 10 Version 1803 for x64-based Systems

Windows 10 Version 1803 for 32-bit Systems

[建議措施:]

1.目前微軟官方已針對此漏洞釋出更新程式，請各機關聯絡設備維護廠商或參考以下建議進行更新：

(1).https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24094

(2).https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24074

(3).https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24086

2.若無法立即更新，可參考官網公告採取緩解措施，並建議經測試再做調整。

(1)CVE-2021-24074執行官網因應措施中之PowerShell指令，停用IPv4之鬆散來源路由，防止攻擊者進行弱點利用，參考連結如下：

    https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24074

(2)CVE-2021-24086與CVE-2021-24094執行官網因應措施中之PowerShell指令，於邊界網路設備上停用IPv6分段，防止攻擊者進行弱點利用，

    參考連結如下：https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24086http...

[參考資料:]

1. https://msrc-blog.microsoft.com/2021/02/09/multiple-security-updates-aff...

2. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24094

3. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24074

4. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-24086

5. https://unit42.paloaltonetworks.com/cve-2021-24074-patch-tuesday/

6. https://www.ithome.com.tw/news/142717