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Microsoft Security Bulletin MS17-014 - Important

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Security Update for Microsoft Office (4013241)

Published: March 14, 2017 | Updated: April 11, 2017

Version: 2.0

Executive Summary

This security update resolves vulnerabilities in Microsoft Office. The most severe of the vulnerabilities could allow remote code execution if a user opens a specially crafted Microsoft Office file. An attacker who successfully exploited the vulnerabilities could run arbitrary code in the context of the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

For more information about the vulnerabilities, see the Affected Software and Vulnerability Severity Ratings section.

The security update addresses the vulnerabilities by:

  • Correcting how Office handles objects in memory
  • Changing the way certain functions handle objects in memory
  • Properly initializing the affected variable
  • Helping to ensure that SharePoint Server properly sanitizes web requests
  • Correcting how the Lync for Mac 2011 client validates certificates

For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 4013241.

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 March bulletin summary.

Note Please see the Security Update Guide for a new approach to consuming the security update information. You can customize your views and create affected software spreadsheets, as well as download data via a restful API. For more information, please see the Security Updates Guide FAQ. As a reminder, the Security Updates Guide will be replacing security bulletins. Please see our blog post, Furthering our commitment to security updates, for more details.

Microsoft Office Software (Table 1 of 2)

Affected Software Microsoft Office Memory Corruption Vulnerability - CVE-2017-0006 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0019 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0020 Microsoft Office Information Disclosure Vulnerability - CVE-2017-0027 Microsoft Office Denial of Service Vulnerability - CVE-2017-0029 Updates Replaced*
Microsoft Office 2007
Microsoft Excel 2007 Service Pack 3 (3178676) Important Remote Code Execution Not applicable Not applicable Important Information Disclosure Not applicable 3128019 in MS16-148
Microsoft Word 2007 Service Pack 3 (3178683) Not applicable Not applicable Not applicable Not applicable Not applicable 3128025 in MS16-148
Microsoft Office 2010
Microsoft Office 2010 Service Pack 2 (32-bit editions) (3178686) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3128032 in MS16-148
Microsoft Office 2010 Service Pack 2 (64-bit editions) (3178686) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3128032 in MS16-148
Microsoft Excel 2010 Service Pack 2 (32-bit editions) (3178690) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128037 in MS16-148
Microsoft Excel 2010 Service Pack 2 (64-bit editions) (3178690) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128037 in MS16-148
Microsoft Word 2010 Service Pack 2 (32-bit editions) (3178687) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3128034 in MS16-148
Microsoft Word 2010 Service Pack 2 (64-bit editions) (3178687) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3128034 in MS16-148
Microsoft Office 2013
Microsoft Excel 2013 Service Pack 1 (32-bit editions) (3172542) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128008 in MS16-148
Microsoft Excel 2013 Service Pack 1 (64-bit editions) (3172542) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128008 in MS16-148
Microsoft Word 2013 Service Pack 1 (32-bit editions) (3172464) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3127932 in MS16-133
Microsoft Word 2013 Service Pack 1 (64-bit editions) (3172464) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3127932 in MS16-133
Microsoft Office 2013 RT
Microsoft Excel 2013 RT Service Pack 1[1](3172542) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128008 in MS16-148
Microsoft Word 2013 RT Service Pack 1[1](3172464) Not applicable Not applicable Not applicable Not applicable Important Denial of Service 3127932 in MS16-133
Microsoft Office 2016
Microsoft Excel 2016 (32-bit edition) (3178673) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128016 in MS16-148
Microsoft Excel 2016 (64-bit edition) (3178673) Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable 3128016 in MS16-148
Microsoft Word 2016 (32-bit edition) (3178674) Not applicable Important Remote Code Execution Not applicable Not applicable Important Denial of Service 3128057 in MS17-002
Microsoft Word 2016 (64-bit edition) (3178674) Not applicable Important Remote Code Execution Not applicable Not applicable Important Denial of Service 3128057 in MS17-002
Microsoft Office for Mac 2011
Microsoft Excel for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198808 in MS16-015
Microsoft Excel for Mac 2011 Not applicable Not applicable Not applicable Important Information Disclosure Not applicable 3198809 in MS17-014
Microsoft Word for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198808 in MS16-015
Microsoft Word for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198808 in MS16-015
Microsoft Office 2016 for Mac
Microsoft Office 2016 for Mac Not applicable Not applicable Not applicable Not applicable Important Denial of Service None
Microsoft Excel 2016 for Mac Not applicable Not applicable Important Remote Code Execution Important Information Disclosure Not applicable None
Other Office Software
Microsoft Office Compatibility Pack Service Pack 3 (3178677) Important Remote Code Execution Not applicable Not applicable Important Information Disclosure Not applicable 3128022 in MS16-148
Microsoft Office Compatibility Pack Service Pack 3 (3178682) Not applicable Not applicable Not applicable Not applicable Not applicable 3128024 in MS16-148
Microsoft Excel Viewer (3178680) Important Remote Code Execution Not applicable Not applicable Not applicable Not applicable 3128023 in MS16-148
Microsoft Word Viewer (3178694) Not applicable Not applicable Not applicable Not applicable Not applicable 3128044 in MS16-148

[1]This update is available via Windows Update.

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Microsoft Office Software (Table 2 of 2)

Affected Software Microsoft Office Memory Corruption Vulnerability - CVE-2017-0030 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0031 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0052 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0053 Microsoft Office Information Disclosure Vulnerability - CVE-2017-0105 Updates Replaced*
Microsoft Office 2007
Microsoft Excel 2007 Service Pack 3 (3178676) Not applicable Not applicable Important Remote Code Execution Not applicable Not applicable 3128019 in MS16-148
Microsoft Word 2007 Service Pack 3 (3178683) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3128025 in MS16-148
Microsoft Office 2010
Microsoft Office 2010 Service Pack 2 (32-bit editions) (3178686) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3128032 in MS16-148
Microsoft Office 2010 Service Pack 2 (64-bit editions) (3178686) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3128032 in MS16-148
Microsoft Excel 2010 Service Pack 2 (32-bit editions) (3178690) Not applicable Not applicable Not applicable Not applicable Not applicable 3128037 in MS16-148
Microsoft Excel 2010 Service Pack 2 (64-bit editions) (3178690) Not applicable Not applicable Not applicable Not applicable Not applicable 3128037 in MS16-148
Microsoft Word 2010 Service Pack 2 (32-bit editions) (3178687) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3141542 in MS16-148
Microsoft Word 2010 Service Pack 2 (64-bit editions) (3178687) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3141542 in MS16-148
Microsoft Office 2013
Microsoft Excel 2013 Service Pack 1 (32-bit editions) (3172542) Not applicable Not applicable Not applicable Not applicable Not applicable 3128008 in MS16-148
Microsoft Excel 2013 Service Pack 1 (64-bit editions) (3172542) Not applicable Not applicable Not applicable Not applicable Not applicable 3128008 in MS16-148
Microsoft Word 2013 Service Pack 1 (32-bit editions) (3172464) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3127932 in MS16-133
Microsoft Word 2013 Service Pack 1 (64-bit editions) (3172464) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3127932 in MS16-133
Microsoft Office 2013 RT
Microsoft Excel 2013 RT Service Pack 1[1](3172542) Not applicable Not applicable Not applicable Not applicable Not applicable 3128008 in MS16-148
Microsoft Word 2013 RT Service Pack 1[1](3172464) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3127932 in MS16-133
Microsoft Office 2016
Microsoft Excel 2016 (32-bit edition) (3178673) Not applicable Not applicable Not applicable Not applicable Not applicable 3128016 in MS16-148
Microsoft Excel 2016 (64-bit edition) (3178673) Not applicable Not applicable Not applicable Not applicable Not applicable 3128016 in MS16-148
Microsoft Word 2016 (32-bit edition) (3178674) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3128057 in MS17-002
Microsoft Word 2016 (64-bit edition) (3178674) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3128057 in MS17-002
Microsoft Office for Mac 2011
Microsoft Excel for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198808 in MS16-015
Microsoft Excel for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198809 in MS17-014
Microsoft Word for Mac 2011 Important Remote Code Execution Important Remote Code Execution Not applicable Not applicable Important Information Disclosure 3198808 in MS16-015
Microsoft Word for Mac 2011 Not applicable Not applicable Not applicable Not applicable Not applicable 3198809 in MS17-014
Microsoft Office 2016 for Mac
Microsoft Office 2016 for Mac Not applicable Not applicable Not applicable Not applicable Not applicable None
Microsoft Excel 2016 for Mac Not applicable Not applicable Not applicable Not applicable Not applicable None
Other Office Software
Microsoft Office Compatibility Pack Service Pack 3 (3178677) Not applicable Not applicable Important Remote Code Execution Not applicable Not applicable 3128022 in MS16-148
Microsoft Office Compatibility Pack Service Pack 3 (3178682) Important Remote Code Execution Important Remote Code Execution Not applicable Important Remote Code Execution Important Information Disclosure 3128024 in MS16-148
Microsoft Excel Viewer (3178680) Not applicable Not applicable Important Remote Code Execution Not applicable Not applicable 3128023 in MS16-148
Microsoft Word Viewer (3178694) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3128044 in MS16-148

[1]This update is available via Windows Update.

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Microsoft Office Services and Web Apps

Affected Software Microsoft Office Memory Corruption Vulnerability - CVE-2017-0006 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0020 Microsoft Office Information Disclosure Vulnerability - CVE-2017-0027 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0030 Microsoft Office Memory Corruption Vulnerability - CVE-2017-0052 Microsoft Office Information Disclosure Vulnerability - CVE-2017-0105 Updates Replaced*
Microsoft SharePoint Server 2007
Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (32-bit edition) (3178678) Important Remote Code Execution Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3127892 in MS16-148
Excel Services on Microsoft SharePoint Server 2007 Service Pack 3 (64-bit edition) (3178678) Important Remote Code Execution Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable 3127892 in MS16-148
Microsoft SharePoint Server 2010
Excel Services on Microsoft SharePoint Server 2010 Service Pack 2 (3178685) Not applicable Not applicable Important Information Disclosure Not applicable Not applicable Not applicable 3128029 in MS16-148
Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2 (3178684) Not applicable Not applicable Not applicable Important Remote Code Execution Not applicable Important Information Disclosure 3128026 in MS16-070
Microsoft SharePoint Server 2013
Excel Services on Microsoft SharePoint Server 2013 Service Pack 1 (3172431) Not applicable Not applicable Important Information Disclosure Not applicable Not applicable Not applicable 3115169 in MS16-107
Microsoft Office Web Apps 2010
Microsoft Office Web Apps 2010 Service Pack 2 (3178689) Not applicable Not applicable Not applicable Important Information Disclosure Not applicable Important Information Disclosure 3128035 in MS16-148
Microsoft Office Web Apps 2013
Microsoft Office Web Apps Server 2013 Service Pack 1 (3172457) Not applicable Important Remote Code Execution Not applicable Not applicable Not applicable Not applicable 3127929 in MS16-133

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Microsoft Server Software

Affected Software Microsoft SharePoint XSS Vulnerability - CVE-2017-0107 Updates Replaced*
Microsoft SharePoint Server 2013
Microsoft SharePoint Foundation 2013 Service Pack 1 (3172540) Important Elevation of Privilege 3115294 in MS16-088

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Microsoft Communications Platforms and Software

Affected Software Microsoft Lync for Mac Certificate Validation Vulnerability - CVE-2017-0129 Updates Replaced*
Microsoft Lync for Mac
Microsoft Lync for Mac 2011 (4012487) Important Security Feature Bypass None

*The Updates Replaced column shows only the latest update in a 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 on the Package Details tab).

Update FAQ

Do these updates contain any additional security-related changes?
Yes. In addition to the changes that are listed for the vulnerabilities described in this bulletin, this update includes defense-in-depth updates to help improve security-related features.

I have Microsoft Word 2010 installed. Why am I not being offered the 3178686 update?
The 3178686 update only applies to systems running specific configurations of Microsoft Office 2010. Some configurations will not be offered the update.

I am being offered this update for software that is not specifically indicated as being affected in the Affected Software and Vulnerability Severity Ratings table. Why am I being offered this update?
When updates address vulnerable code that exists in a component that is shared between multiple Microsoft Office products or shared between multiple versions of the same Microsoft Office product, the update is considered to be applicable to all supported products and versions that contain the vulnerable component.

For example, when an update applies to Microsoft Office 2007 products, only Microsoft Office 2007 may be specifically listed in the Affected Software table. However, the update could apply to Microsoft Word 2007, Microsoft Excel 2007, Microsoft Visio 2007, Microsoft Compatibility Pack, Microsoft Excel Viewer, or any other Microsoft Office 2007 product that is not specifically listed in the Affected Software table. Furthermore, when an update applies to Microsoft Office 2010 products, only Microsoft Office 2010 may be specifically listed in the Affected Software table. However, the update could apply to Microsoft Word 2010, Microsoft Excel 2010, Microsoft Visio 2010, Microsoft Visio Viewer, or any other Microsoft Office 2010 product that is not specifically listed in the Affected Software table.

For more information on this behavior and recommended actions, see Microsoft Knowledge Base Article 830335. For a list of Microsoft Office products that an update may apply to, refer to the Microsoft Knowledge Base Article associated with the specific update.

Vulnerability Information

Multiple Microsoft Office Memory Corruption Vulnerabilities

Multiple remote code execution vulnerabilities exist in Microsoft Office software when the Office software fails to properly handle objects in memory. An attacker who successfully exploited the vulnerabilities could run arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker could take control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Exploitation of the vulnerabilities requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario an attacker could exploit the vulnerabilities by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerabilities. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince them to open the specially crafted file.

Note that the Preview Pane is not an attack vector for these vulnerabilities. The security update addresses the vulnerabilities by correcting how Office handles objects in memory.

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
Microsoft Office Memory Corruption Vulnerability CVE-2017-0006 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0019 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0020 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0030 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0031 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0052 No No
Microsoft Office Memory Corruption Vulnerability CVE-2017-0053 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

The following workaround may be helpful in your situation:

Workaround for CVE-2017-0019

  • Use Microsoft Office File Block policy to prevent Office from opening RTF documents from unknown or untrusted sources

    Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

    For Office 2016

    1. Run regedit.exe as Administrator and navigate to the following subkey:
        [HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\FileBlock]
    1. Set the RtfFiles DWORD value to 2.
    2. Set the OpenInProtectedView DWORD value to 0.

    Impact of Workaround. Users who have configured the File Block policy and have not configured a special “exempt directory” as discussed in Microsoft Knowledge Base Article 922849 will be unable to open documents saved in the RTF format.

    How to undo the workaround

    For Office 2016

    1. Run regedit.exe as Administrator and navigate to the following subkey:
        [HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Word\Security\FileBlock]
    1. Set the RtfFiles DWORD value to 0.
    2. Set the OpenInProtectedView DWORD value to 0.

Microsoft Office Information Disclosure Vulnerability - CVE-2017-0027

An information disclosure vulnerability exists when Microsoft Office improperly discloses the contents of its memory. An attacker who exploited the vulnerability could use the information to compromise the user’s computer or data.

To exploit the vulnerability, an attacker could craft a special document file and then convince the user to open it. An attacker must know the memory address location where the object was created.

The update addresses the vulnerability by changing the way certain functions handle objects in memory.

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
Microsoft Office Information Disclosure Vulnerability CVE-2017-0027 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Microsoft Office Denial of Service Vulnerability - CVE-2017-0029

A denial of service vulnerability exists when a specially crafted file is opened in Microsoft Office. An attacker who successfully exploited the vulnerability could cause Office to stop responding. Note that the denial of service would not allow an attacker to execute code or to elevate the attacker's user rights.

For an attack to be successful, this vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office. In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted file to the user and by convincing the user to open the file.

The security update addresses the vulnerability by correcting how Microsoft Office handles objects in memory.

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
Microsoft Office Denial of Service Vulnerability CVE-2017-0029 Yes No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Microsoft Office Information Disclosure Vulnerability - CVE-2017-0105

An information disclosure vulnerability exists when Microsoft Office software reads out of bound memory due to an uninitialized variable, which could disclose the contents of memory. An attacker who successfully exploited the vulnerability could view out of bound memory.

Exploitation of the vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software.

The security update addresses the vulnerability by properly initializing the affected variable.

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
Microsoft Office Information Disclosure Vulnerability CVE-2017-0105 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Microsoft SharePoint XSS Vulnerability - CVE-2017-0107

An elevation of privilege vulnerability exists when Microsoft SharePoint Server does not properly sanitize a specially crafted web request to an affected SharePoint server. An authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected SharePoint server.

An attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run script in the security context of the current user. These attacks could allow the attacker to read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the victim, such as change permissions and delete content, and to inject malicious content in the browser of the victim.

The security update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes web 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
Microsoft SharePoint XSS Vulnerability CVE-2017-0107 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Microsoft Lync for Mac Certificate Validation Vulnerability - CVE-2017-0129

A security feature bypass exists when the Lync for Mac 2011 client fails to properly validate certificates. An attacker who successfully exploited this vulnerability could tamper with trusted communications between the server and target client.

To exploit the vulnerability an attacker would need to intercept and tamper with network traffic.

The security update addresses the vulnerability by correcting how the Lync for Mac 2011 client validates certificates.

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
Microsoft Lync for Mac Certificate Validation Vulnerability CVE-2017-0129 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Security Update Deployment

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced 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.

Revisions

  • V1.0 (March 14, 2017): Bulletin published.
  • V2.0 (April 11, 2017): To comprehensively address CVE-2017-0027 for Office for Mac 2011 only, Microsoft is releasing security update 3212218. Microsoft recommends that customers running Office for Mac 2011 install update 3212218 to be fully protected from this vulnerability. See Microsoft Knowledge Base Article 3212218 for more information.

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