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URL: https://www.cisa.gov/uscert/ncas/current-activity/2017/01/16/SMB-Security-Best-Practices
Submission: On February 10 via api from US — Scanned from DE

Form analysis 3 forms found in the DOM

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https://public.govdelivery.com/accounts/USDHSCISA/subscribers/qualify

<form action="https://public.govdelivery.com/accounts/USDHSCISA/subscribers/qualify"><label class="visually-hidden" for="email-address-field">Enter your email address</label> <input class="signup-form" id="email-address-field" name="email"
    placeholder=" Enter your email address" title="Enter your email address" type="text"><br><input class="btn btn-primary" name="submit" title="Sign up for alerts" type="submit" value="Sign Up">&nbsp;</form>

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CERTMAIN MENU

 * Alerts and Tips
 * Resources
 * Industrial Control Systems

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 1. National Cyber Awareness System    >
 2. Current Activity    >
 3. SMB Security Best Practices


SMB SECURITY BEST PRACTICES

Original release date: January 16, 2017 | Last revised: March 16, 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 SMBv1 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 that disabling or blocking SMB may
create problems by obstructing access to shared files, data, or devices. The
benefits of mitigation should be weighed against potential disruptions to users.
For more information on SMB, please review Microsoft Security Advisories
2696547(link is external) and 204279(link is external).

This product is provided subject to this Notification and this Privacy & Use
policy.

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We recently updated our anonymous product survey; we'd welcome your feedback.


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