==================================================================== CERT-Renater Note d'Information No. 2017/VULN065 _____________________________________________________________________ DATE : 15/03/2017 HARDWARE PLATFORM(S): / OPERATING SYSTEM(S): Windows versions Vista, 7, 8, Server 2008, 8.1, Server 2012, RT 8.1, 10, Server 2016 running Windows SMB. ===================================================================== KB4013389 https://technet.microsoft.com/en-us/library/security/MS17-010 ____________________________________________________________________ Microsoft Security Bulletin MS17-010: Security Update for Windows SMB Server (4013389) Bulletin Number: MS17-010 Bulletin Title: Security Update for Microsoft Windows SMB Server Severity: Critical KB Article: 4013389 Version: 1.0 Published Date: 14/03/2017 Executive Summary This security update resolves vulnerabilities in Microsoft Windows. The most severe of the vulnerabilities could allow remote code execution if an attacker sends specially crafted messages to a Windows SMBv1 server. This security update is rated Critical for all supported releases of Microsoft Windows. For more information, see the Affected Software and Vulnerability Severity Ratings section. The security update addresses the vulnerabilities by correcting how SMBv1 handles specially crafted requests. For more information about the vulnerabilities, see the Vulnerability Information section. For more information about this update, see Microsoft Knowledge Base Article 4013078. Affected Software Windows Vista Windows Server 2008 Windows 7 Windows Server 2008 R2 Windows 8.1 Windows Server 2012 Windows Server 2012 R2 Windows RT 8.1 Windows 10 Windows Server 2016 Vulnerability Information Multiple Windows SMB Remote Code Execution Vulnerabilities Remote code execution vulnerabilities exist in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited the vulnerabilities could gain the ability to execute code on the target server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server. The security update addresses the vulnerabilities by correcting how SMBv1 handles these specially crafted requests. Mitigating Factors Microsoft has not identified any mitigating factors for these vulnerabilities. Workarounds The following workarounds may be helpful in your situation: Disable SMBv1 For customers running Windows Vista and later See Microsoft Knowledge Base Article 2696547. Alternative method for customers running Windows 8.1 or Windows Server 2012 R2 and later For client operating systems: a. Open Control Panel, click Programs, and then click Turn Windows features on or off. b. In the Windows Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window. c. Restart the system. For server operating systems: a. Open Server Manager and then click the Manage menu and select Remove Roles and Features. b. In the Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window. c. Restart the system. Impact of workaround. The SMBv1 protocol will be disabled on the target system. How to undo the workaround. Retrace the workaround steps, instead restoring the SMB1.0/CIFS File Sharing Support feature to an active state. Windows SMB Information Disclosure Vulnerability CVE-2017-0147 An information disclosure vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) server handles certain requests. An attacker who successfully exploited this vulnerability could craft a special packet, which could lead to information disclosure from the server. To exploit the vulnerability, in most situations, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv1 server. The security update addresses the vulnerability by correcting how SMBv1 handles these specially crafted requests. Mitigating Factors Microsoft has not identified any mitigating factors for this vulnerability. Workarounds The following workarounds may be helpful in your situation: Disable SMBv1 For customers running Windows Vista and later See Microsoft Knowledge Base Article 2696547. Alternative method for customers running Windows 8.1 or Windows Server 2012 R2 and later For client operating systems: a. Open Control Panel, click Programs, and then click Turn Windows features on or off. b. In the Windows Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window. c. Restart the system. For server operating systems: a. Open Server Manager and then click the Manage menu and select Remove Roles and Features. b. In the Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window. c. Restart the system. Impact of workaround. The SMBv1 protocol will be disabled on the target system. How to undo the workaround. Retrace the workaround steps, instead restoring the SMB1.0/CIFS File Sharing Support feature to an active state. Security Update Deployment For Security Update Deployment information, see the Microsoft Knowledge Base article referenced here in the Executive Summary. Acknowledgments Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information. Disclaimer The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. ========================================================== Serveur de référence du CERT-Renater https://services.renater.fr/ssi/ ========================================================== + CERT-RENATER | tel : 01-53-94-20-44 + + 23 - 25 Rue Daviel | fax : 01-53-94-20-41 + + 75013 Paris | email: cert@support.renater.fr + ==========================================================