轉發 國家資安資訊分享與分析中心 NISAC-200-202510-00000308

[內容說明]
研究人員發現Windows SMB用戶端存在NTLM反射(NTLM Reflection)漏洞(CVE-2025-33073)。取得一般使用者權限之遠端攻擊者，可透過執行惡意腳本，迫使SMB用戶端與攻擊者控制之SMB伺服器連線並進行身分鑑別，由於SMB用戶端在驗證階段存在缺陷，攻擊者可藉此繞過安全檢核以提升至系統權限，進而控制用戶端系統。該漏洞已遭駭客利用，請儘速確認並進行修補。

[影響平台]
● Windows Server 2025 (Server Core installation)
● Windows Server 2025
● Windows Server 2022, 23H2 Edition (Server Core installation)
● Windows Server 2022 (Server Core installation)
● Windows Server 2022
● Windows Server 2019 (Server Core installation)
● Windows Server 2019
● Windows Server 2016 (Server Core installation)
● Windows Server 2016
● 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 11 Version 24H2 for x64-based Systems
● Windows 11 Version 24H2 for ARM64-based Systems
● Windows 11 Version 23H2 for x64-based Systems
● Windows 11 Version 23H2 for ARM64-based Systems
● Windows 11 Version 22H2 for x64-based Systems
● Windows 11 Version 22H2 for ARM64-based Systems
● Windows 10 Version 22H2 for x64-based Systems
● Windows 10 Version 22H2 for ARM64-based Systems
● Windows 10 Version 22H2 for 32-bit Systems
● Windows 10 Version 21H2 for x64-based Systems
● Windows 10 Version 21H2 for ARM64-based Systems
● Windows 10 Version 21H2 for 32-bit Systems
● Windows 10 Version 1809 for x64-based Systems
● Windows 10 Version 1809 for 32-bit Systems
● 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

[建議措施]
官方已針對漏洞釋出修復更新，請參考官方說明進行更新，網址如下：
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073

[參考資料]
1. https://nvd.nist.gov/vuln/detail/CVE-2025-33073
2. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073
3. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073
4. https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products

Forwarded from the National Cybersecurity Information Sharing and Analysis Center NISAC-200-202510-00000308

[Content Description] Researchers have discovered an NTLM Reflection vulnerability (CVE-2025-33073) in the Windows SMB client. A remote attacker with ordinary user privileges can execute malicious scripts to force the SMB client to connect to an attacker-controlled SMB server and perform authentication. Due to a flaw in the SMB client's authentication phase, the attacker can bypass security checks to escalate to system privileges and control the client system. This vulnerability has already been exploited by hackers; please confirm and patch it as soon as possible.

[Influence Platform]
● Windows Server 2025 (Server Core installation)
● Windows Server 2025
● Windows Server 2022, 23H2 Edition (Server Core installation)
● Windows Server 2022 (Server Core installation)
● Windows Server 2022
● Windows Server 2019 (Server Core installation)
● Windows Server 2019
● Windows Server 2016 (Server Core installation)
● Windows Server 2016
● 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 11 Version 24H2 for x64-based Systems
● Windows 11 Version 24H2 for ARM64-based Systems
● Windows 11 Version 23H2 for x64-based Systems
● Windows 11 Version 23H2 for ARM64-based Systems
● Windows 11 Version 22H2 for x64-based Systems
● Windows 11 Version 22H2 for ARM64-based Systems
● Windows 10 Version 22H2 for x64-based Systems
● Windows 10 Version 22H2 for ARM64-based Systems
● Windows 10 Version 22H2 for 32-bit Systems
● Windows 10 Version 21H2 for x64-based Systems
● Windows 10 Version 21H2 for ARM64-based Systems
● Windows 10 Version 21H2 for 32-bit Systems
● Windows 10 Version 1809 for x64-based Systems
● Windows 10 Version 1809 for 32-bit Systems
● 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

[Recommended Actions] An official update has been released to fix the vulnerability. Please refer to the official instructions to update. The URL is as follows: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073

[References]
1. https://nvd.nist.gov/vuln/detail/CVE-2025-33073
2. https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-33073
3. https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33073
4. https://www.vicarius.io/vsociety/posts/cve-2025-33073-mitigation-script-improper-access-control-in-windows-smb-affects-microsoft-products