Microsoft Security Bulletin MS17-010 - Critical

Microsoft Security Bulletin MS17-010 - Critical

Security Update for Microsoft Windows SMB Server (4013389)

Published: March 14, 2017

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 Microsoft Server Message Block 1.0 (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 4013389.

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.

The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title

CVE number

Publicly disclosed

Exploited

Windows SMB Remote Code Execution Vulnerability

CVE-2017-0143

No

No

Windows SMB Remote Code Execution Vulnerability

CVE-2017-0144

No

No

Windows SMB Remote Code Execution Vulnerability

CVE-2017-0145

No

No

Windows SMB Remote Code Execution Vulnerability

CVE-2017-0146

No

No

Windows SMB Remote Code Execution Vulnerability

CVE-2017-0148

No

No

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:

    1. Open Control Panel, click Programs, and then click Turn Windows features on or off.
    2. In the Windows Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window.
    3. Restart the system.
       

    For server operating systems:

    1. Open Server Manager and then click the Manage menu and select Remove Roles and Features.
    2. In the Features window, clear the SMB1.0/CIFS File Sharing Support check box, and then click OK to close the window.
    3. 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, and select the SMB1.0/CIFS File Sharing Support check box to restore 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.

The following table contains links to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title

CVE number

Publicly disclosed

Exploited

Windows SMB Information Disclosure Vulnerability

CVE-2017-0147

No

No

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:

    1. Open Control Panel, click Programs, and then click Turn Windows features on or off.
    2. In the Windows Features window, clear the SMB1.0/CIFS File Sharing Support checkbox, and then click OK to close the window.
    3. Restart the system.
       

    For server operating systems:

    1. Open Server Manager and then click the Manage menu and select Remove Roles and Features.
    2. In the Features window, clear the SMB1.0/CIFS File Sharing Support check box, and then click OK to close the window.
    3. 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, and select the SMB1.0/CIFS File Sharing Support check box to restore the SMB1.0/CIFS File Sharing Support feature to an active state.

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