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SMB Security Best Practices
From: "US-CERT" <US-CERT () ncas us-cert gov>
Date: Tue, 17 Jan 2017 07:12:52 -0600
U.S. Department of Homeland Security US-CERT National Cyber Awareness System: SMB Security Best Practices [ https://www.us-cert.gov/ncas/current-activity/2017/01/16/SMB-Security-Best-Practices ] 01/16/2017 11:45 PM EST Original release date: January 16, 2017 | Last revised: January 17, 2017 In response to public reporting of a potential Server Message Block (SMB) vulnerability, US-CERT is providing known best practices related to SMB. This service is universally available for Windows systems, and legacy versions of SMB protocols could allow a remote attacker to obtain sensitive information from affected systems. US-CERT recommends that users and administrators consider: * disabling SMB v1 and * blocking all versions of SMB at the network boundary by blocking TCP port 445 with related protocols on UDP ports 137-138 and TCP port 139, for all boundary devices. US-CERT cautions users and administrators of potential issues that could be created by disabling SMB v1. For more information on SMB, review Microsoft Security Advisories 2696547 [ https://support.microsoft.com/en-us/kb/2696547 ] and 204279 [ https://support.microsoft.com/en-us/kb/204279 ]. ________________________________________________________________________ This product is provided subject to this Notification [ http://www.us-cert.gov/privacy/notification ] and this Privacy & Use [ http://www.us-cert.gov/privacy/ ] policy. ________________________________________________________________________ A copy of this publication is available at www.us-cert.gov [ https://www.us-cert.gov ]. If you need help or have questions, please send an email to info () us-cert gov. Do not reply to this message since this email was sent from a notification-only address that is not monitored. To ensure you receive future US-CERT products, please add US-CERT () ncas us-cert gov to your address book. OTHER RESOURCES: Contact Us [ http://www.us-cert.gov/contact-us/ ] | Security Publications [ http://www.us-cert.gov/security-publications ] | Alerts and Tips [ http://www.us-cert.gov/ncas ] | Related Resources [ http://www.us-cert.gov/related-resources ] STAY CONNECTED: Sign up for email updates [ http://public.govdelivery.com/accounts/USDHSUSCERT/subscriber/new ]
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- SMB Security Best Practices US-CERT (Jan 17)