Microsoft Security Bulletin MS16-114 - Important
Security Update for Windows SMBv1 Server (3185879)
Published: September 13, 2016
Version: 1.0
Executive Summary
This security update resolves a vulnerability in Microsoft Windows. On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 operating systems, the vulnerability could allow remote code execution if an authenticated attacker sends specially crafted packets to an affected Microsoft Server Message Block 1.0 (SMBv1) Server. The vulnerability does not impact other SMB Server versions. Although later operating systems are affected, the potential impact is denial of service.
This security update is rated Important for all supported releases of Microsoft Windows. For more information, see the Affected Software and Vulnerability Severity Ratings section.
The security update addresses the vulnerability by correcting how the Microsoft SMBv1 Server handles specially crafted requests. For more information about the vulnerability, see the Vulnerability Information section.
For more information about this update, see Microsoft Knowledge Base Article 3185879.
Affected Software and Vulnerability Severity Ratings
The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.
The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the September bulletin summary.
**Operating System** | [**Windows SMB Authenticated Remote Code Execution Vulnerability - CVE-2016-3345**](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3345) | **Updates Replaced**\* |
**Windows Vista** | ||
[Windows Vista Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=f6c97580-0371-40e4-baa0-ee0b08568210) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Vista x64 Edition Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=f694edbd-f71b-4d18-b5ae-ef65bfefd5f9) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
**Windows Server 2008** | ||
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=fbe895de-1548-483d-8e48-1d106e953082) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=a1a3bd7e-35a8-466d-ba1c-5dc2c1f15252) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Server 2008 for Itanium-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=d9f05505-d358-4c99-a6c9-af82010ac6a3) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
**Windows 7** | ||
[Windows 7 for 32-bit Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=2fc5b497-1cd6-4195-8e2b-fec332f53f4d) (3177186) | **Important** Remote Code Execution | [2536275](https://support.microsoft.com/kb/2536275) |
[Windows 7 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=a1758d07-f328-4584-a87d-15448228fa14) (3177186) | **Important** Remote Code Execution | [2536275](https://support.microsoft.com/kb/2536275) |
**Windows Server 2008 R2** | ||
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=9106042a-8936-4e8a-bb35-572c0198e45b) (3177186) | **Important** Remote Code Execution | [2536275](https://support.microsoft.com/kb/2536275) |
[Windows Server 2008 R2 for Itanium-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=bbf1d6ba-e30f-41a8-ad72-bf004014a47f) (3177186) | **Important** Remote Code Execution | [2536275](https://support.microsoft.com/kb/2536275) |
**Windows 8.1** | ||
[Windows 8.1 for 32-bit Systems](https://www.microsoft.com/download/details.aspx?familyid=76cde9cc-1368-478a-b521-4cde9924cc17) (3177186) | **Important** Denial of Service | [3130896](https://support.microsoft.com/kb/3130896) |
[Windows 8.1 for x64-based Systems](https://www.microsoft.com/download/details.aspx?familyid=98e89316-e871-42d6-84d3-13e57ca10cc9) (3177186) | **Important** Denial of Service | [3130896](https://support.microsoft.com/kb/3130896) |
**Windows Server 2012 and Windows Server 2012 R2** | ||
[Windows Server 2012](https://www.microsoft.com/download/details.aspx?familyid=f6370a66-2bfe-463e-88a2-3ce5dbaa4147) (3177186) | **Important** Denial of Service | [3130896](https://support.microsoft.com/kb/3130896) |
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=361d7558-bd41-4078-94b0-004a07d9528b) (3177186) | **Important** Denial of Service | [3130896](https://support.microsoft.com/kb/3130896) |
**Windows RT 8.1** | ||
Windows RT 8.1[1] (3177186) | **Important** Denial of Service | None |
**Windows 10** | ||
[Windows 10 for 32-bit Systems](https://support.microsoft.com/kb/3185611)[2] (3185611) | **Important** Denial of Service | [3176492](https://support.microsoft.com/kb/3176492) |
[Windows 10 for x64-based Systems](https://support.microsoft.com/kb/3185611)[2] (3185611) | **Important** Denial of Service | [3176492](https://support.microsoft.com/kb/3176492) |
[Windows 10 Version 1511 for 32-bit Systems](https://support.microsoft.com/kb/3185614)[2] (3185614) | **Important** Denial of Service | [3176493](https://support.microsoft.com/kb/3176493) |
[Windows 10 Version 1511 for x64-based Systems](https://support.microsoft.com/kb/3185614)[2] (3185614) | **Important** Denial of Service | [3176493](https://support.microsoft.com/kb/3176493) |
[Windows 10 Version 1607 for 32-bit Systems](https://support.microsoft.com/kb/3189866)[2] (3189866) | **Important** Denial of Service | [3176495](https://support.microsoft.com/kb/3176495) |
[Windows 10 Version 1607 for x64-based Systems](https://support.microsoft.com/kb/3189866)[2] (3189866) | **Important** Denial of Service | [3176495](https://support.microsoft.com/kb/3176495) |
**Server Core installation option** | ||
[Windows Server 2008 for 32-bit Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=fbe895de-1548-483d-8e48-1d106e953082)(Server Core installation) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Server 2008 for x64-based Systems Service Pack 2](https://www.microsoft.com/download/details.aspx?familyid=a1a3bd7e-35a8-466d-ba1c-5dc2c1f15252)(Server Core installation) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Server 2008 R2 for x64-based Systems Service Pack 1](https://www.microsoft.com/download/details.aspx?familyid=a1a3bd7e-35a8-466d-ba1c-5dc2c1f15252)(Server Core installation) (3177186) | **Important** Remote Code Execution | 3073921 in [MS15-083](http://go.microsoft.com/fwlink/?linkid=619627) |
[Windows Server 2012](https://www.microsoft.com/download/details.aspx?familyid=f6370a66-2bfe-463e-88a2-3ce5dbaa4147)(Server Core installation) (3177186) | **Important** Denial of Service | None |
[Windows Server 2012 R2](https://www.microsoft.com/download/details.aspx?familyid=361d7558-bd41-4078-94b0-004a07d9528b)(Server Core installation) (3177186) | **Important** Denial of Service | None |
[2]Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The update is available via the Windows Update Catalog.
Note The vulnerability discussed in this bulletin affects Windows Server 2016 Technical Preview 5. To be protected from the vulnerability, Microsoft recommends that customers running this operating system apply the current update, which is available from Windows Update.
*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).
Vulnerability Information
Windows SMB Authenticated Remote Code Execution Vulnerability – CVE-2016-3345
For Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 operating systems a remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1.0 (SMBv1) Server handles certain requests when an authenticated attacker sends specially crafted packets to the SMBv1 server. The vulnerability does not impact other SMB Server versions.
On later operating systems an attacker who successfully exploited this vulnerability could cause the affected system to stop responding until it is manually restarted.
To exploit the vulnerability an attacker would first need to authenticate to the SMBv1 Server and have permission to open files on the target server before attempting the attack.
The security update addresses the vulnerability by correcting how the Microsoft SMBv1 Server handles 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 Authenticated Remote Code Execution Vulnerability | CVE-2016-3345 | No | No |