發佈編號：TACERT-ANA-2021021810023838
發佈時間：2021-02-18 10:08:39
事故類型：ANA-漏洞預警
發現時間：2021-02-18 10:08:39
影響等級：中
[主旨說明:]
【漏洞預警】微軟Windows TCP/IP存在安全漏洞(CVE-2021-24074、CVE-2021-24094及CVE-2021-24086)，允許攻擊者遠端執行任意程式碼或造成服務阻斷，請儘速確認並進行更新！
[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
(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：CVE-2021-24086、CVE-2021-24094
[參考資料:]
1.https://msrc-blog.microsoft.com/2021/02/09/multiple-security-updates-affecting-tcp-ip/
2. https://unit42.paloaltonetworks.com/cve-2021-24074-patch-tuesday/
3.微軟呼籲用戶修補3個Windows TCP/IP實作漏洞，影響所有版本
(此通報僅在於告知相關資訊，並非為資安事件)，如果您對此通報的內容有疑問或有關於此事件的建議，歡迎與我們連絡。
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