Microsoft Security Bulletin MS15-033 - Critical

Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (3048019)

Published: April 14, 2015 | Updated: April 21, 2015

Version: 1.1

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.

This security update is rated Critical for all supported editions of the following software:

  • Microsoft Word 2007, Microsoft Office 2010, Microsoft Word 2010
  • Microsoft Word Viewer, Microsoft Office Compatibility Pack
  • Word Automation Services on Microsoft SharePoint Server 2010
  • Microsoft Office Web Apps Server 2010

This security update is rated Important for all supported editions of the following software:

  • Microsoft Word 2013
  • Microsoft Office for Mac 2011, Microsoft Word for Mac 2011, Outlook for Mac for Office 365
  • Word Automation Services on Microsoft SharePoint Server 2013
  • Microsoft Office Web Apps Server 2013

For more information, see the Affected Software section.

The security update addresses the vulnerabilities by correcting how Microsoft Office parses specially crafted files, by correcting how Office handles files in memory, and by helping to ensure that SharePoint Server properly sanitizes user input. For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3048019

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

Microsoft Office Software

Microsoft Office Suites Software

Component

Maximum Security Impact

Aggregate Severity Rating

Updates Replaced

Microsoft Office 2007

Microsoft Office 2007 Service Pack 3

Microsoft Word 2007 Service Pack 3
(2965284)

Remote Code Execution

Critical

2956109 in MS15-022

Microsoft Office 2010

Microsoft Office 2010 Service Pack 2 (32-bit editions)
(2965236)

Not applicable

Remote Code Execution

Critical

2956138 in MS15-022

Microsoft Office 2010 Service Pack 2 (64-bit editions)
(2965236)

Not applicable

Remote Code Execution

Critical

2956138 in MS15-022

Microsoft Office 2010 Service Pack 2 (32-bit editions)

Microsoft Word 2010 Service Pack 2 (32-bit editions)
(2553428)

Remote Code Execution

Critical

2956139 in MS15-022

Microsoft Office 2010 Service Pack 2 (64-bit editions)

Microsoft Word 2010 Service Pack 2 (64-bit editions)
(2553428)

Remote Code Execution

Critical

2956139 in MS15-022

Microsoft Office 2013 and Microsoft Office 2013 RT

Microsoft Office 2013 Service Pack 1 (32-bit editions)

Microsoft Word 2013 Service Pack 1 (32-bit editions)
(2965224)

Remote Code Execution

Important

2956163 in MS15-022

Microsoft Office 2013 Service Pack 1 (64-bit editions)

Microsoft Word 2013 Service Pack 1 (64-bit editions)
(2965224)

Remote Code Execution

Important

2956163 in MS15-022

Microsoft Office 2013 RT Service Pack 1

Microsoft Word 2013 RT Service Pack 1
(2965224) [1]

Remote Code Execution

Important

2956163 in MS15-022

Microsoft Office for Mac

Microsoft Outlook for Mac for Office 365
(3055707)

Not applicable

Elevation of Privilege

Important

None

Microsoft Office for Mac 2011
(3051737)

Not applicable

Elevation of Privilege

Important

3018888 in MS14-081

Microsoft Office for Mac 2011

Microsoft Word for Mac 2011
(3051737)

Remote Code Execution

Important

3018888 in MS14-081

Other Office Software

Microsoft Word Viewer
(2965289)

Not applicable

Remote Code Execution

Critical

2956188 in MS15-022

Microsoft Office Compatibility Pack Service Pack 3
(2965210)

Not applicable

Remote Code Execution

Critical

2956107 in MS15-022

[1]This update is available via Windows Update

Microsoft Office Services and Web Apps

Microsoft Office Services and Web Apps

Component

Maximum Security Impact

Aggregate Severity Rating

Updates Replaced

Microsoft SharePoint Server 2010

Microsoft SharePoint Server 2010 Service Pack 2

Word Automation Services
(2553164)

Remote Code Execution

Critical

2956136 in MS15-022

Microsoft SharePoint Server 2013

Microsoft SharePoint Server 2013 Service Pack 1

Word Automation Services
(2965215)

Remote Code Execution

Important

2920731 in MS15-022

Microsoft Office Web Apps 2010

Microsoft Office Web Apps 2010 Service Pack 2

Microsoft Office Web Apps Server 2010 Service Pack 2
(2965238)

Remote Code Execution

Critical

2956069 in MS15-022

Microsoft Office Web Apps 2013

Microsoft Office Web Apps 2013 Service Pack 1

Microsoft Office Web Apps Server 2013 Service Pack 1 [2]
(2965306)

Remote Code Execution

Important

2956158 in MS15-022

[2] Office Web Apps Server cannot be updated via automatic updating. For recommended instructions on how to apply updates to Office Web Apps Server, see Apply software updates to Office Web Apps Server

 

Does this update contain any additional security-related changes to functionality? 
Yes. In addition to the changes that are listed for the vulnerabilities described in this bulletin, this update includes defense-in-depth updates to Microsoft Office for Mac 2011 to help make it more secure.

I have Microsoft Word 2010 installed. Why am I not being offered the 2965236 update? 
The 2965236 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 listed in the Affected Software 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.

For example, 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 example, when an update applies to Microsoft Office 2013 products, only Microsoft Office 2013 may be specifically listed in the Affected Software table. However, the update could apply to Microsoft Word 2013, Microsoft Excel 2013, Microsoft Visio 2013, or any other Microsoft Office 2013 product that is not specifically listed in the Affected Software table.

Does this update contain any additional security-related changes? 
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.

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 April bulletin summary.  

Microsoft Office Software

Vulnerability Severity Rating and Maximum Security Impact by Affected Software

Affected Software

Microsoft Office Memory Corruption Vulnerability – CVE-2015-1641

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1649

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1650

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1651

Microsoft Outlook App for Mac XSS Vulnerability – CVE-2015-1639

Aggregate Severity Rating

Microsoft Office 2007

Microsoft Word 2007 Service Pack 3

Important
Remote Code Execution
(2965284)

Critical
Remote Code Execution
(2965284)

Important
Remote Code Execution
(2965284)

Critical
Remote Code Execution
(2965284)

Not applicable

Critical

Microsoft Office 2010

Microsoft Office 2010 Service Pack 2 (32-bit editions)

Important
Remote Code Execution
(2965236)

Critical
Remote Code Execution
(2965236)

Important
Remote Code Execution
(2965236)

Not applicable

Not applicable

Critical

Microsoft Office 2010 Service Pack 2 (64-bit editions)

Important
Remote Code Execution
(2965236)

Critical
Remote Code Execution
(2965236)

Important
Remote Code Execution
(2965236)

Not applicable

Not applicable

Critical

Microsoft Word 2010 Service Pack 2 (32-bit editions)

Important
Remote Code Execution
(2553428)

Critical
Remote Code Execution
(2553428)

Important
Remote Code Execution
(2553428)

Not applicable

Not applicable

Critical

Microsoft Word 2010 Service Pack 2 (64-bit editions)

Important
Remote Code Execution
(2553428)

Critical
Remote Code Execution
(2553428)

Important
Remote Code Execution
(2553428)

Not applicable

Not applicable

Critical

Microsoft Office 2013 and Microsoft Office 2013 RT

Microsoft Word 2013 Service Pack 1 (32-bit editions)

Important
Remote Code Execution
(2965224)

Not applicable

Important
Remote Code Execution
(2965224)

Not applicable

Not applicable

Important

Microsoft Word 2013 Service Pack 1 (64-bit editions)

Important
Remote Code Execution
(2965224)

Not applicable

Important
Remote Code Execution
(2965224)

Not applicable

Not applicable

Important

Microsoft Word 2013 RT Service Pack 1

Important
Remote Code Execution
(2965224)

Not applicable

Important
Remote Code Execution
(2965224)

Not applicable

Not applicable

Important

Microsoft Office for Mac

Microsoft Outlook for Mac for Office 365

Not applicable

Not applicable

Not applicable

Not applicable

Not applicable

Important
Elevation of Privilege
(3055707)

Microsoft Office for Mac 2011

Not applicable

Not applicable

Not applicable

Not applicable

Important
Elevation of Privilege
(3051737)

Important

Microsoft Word for Mac 2011

Important
Remote Code Execution
(3051737)

Not applicable

Not applicable

Not applicable

Not applicable

Important

Other Office Software

Microsoft Word Viewer

Not applicable

Critical
Remote Code Execution
(2965289)

Important
Remote Code Execution
(2965289)

Critical
Remote Code Execution
(2965289)

Not applicable

Critical

Microsoft Office Compatibility Pack Service Pack 3

Important
Remote Code Execution
(2965210)

Critical
Remote Code Execution
(2965210)

Important
Remote Code Execution
(2965210)

Critical
Remote Code Execution
(2965210)

Not applicable

Critical

 

Microsoft Office Services and Web Apps

Vulnerability Severity Rating and Maximum Security Impact by Affected Software

Affected Software

Microsoft Office Memory Corruption Vulnerability – CVE-2015-1641

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1649

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1650

Microsoft Office Component Use After Free Vulnerability - CVE-2015-1651

Microsoft Outlook App for Mac XSS Vulnerability – CVE-2015-1639

Aggregate Severity Rating

Microsoft SharePoint Server 2010

Word Automation Services on Microsoft SharePoint Server 2010 Service Pack 2

Important
Remote Code Execution
(2553164)

Critical
Remote Code Execution
(2553164)

Important
Remote Code Execution
(2553164)

Not applicable

Not applicable

Critical

Microsoft SharePoint Server 2013

Word Automation Services on Microsoft SharePoint Server 2013 Service Pack 1

Important
Remote Code Execution
(2965215)

Not applicable

Important
Remote Code Execution
(2965215)

Not applicable

Not applicable

Important

Microsoft Office Web Apps 2010

Microsoft Office Web Apps Server 2010 Service Pack 2

Important
Remote Code Execution
(2965238)

Critical
Remote Code Execution
(2965238)

Important
Remote Code Execution
(2965238)

Not applicable

Not applicable

Critical

Microsoft Office Web Apps 2013

Microsoft Office Web Apps Server 2013 Service Pack 1

Important
Remote Code Execution
(2965306)

Not applicable

Important
Remote Code Execution
(2965306)

Not applicable

Not applicable

Important

 

Microsoft Office Memory Corruption Vulnerability - CVE-2015-1641

A remote code execution vulnerability exists in Microsoft Office software when the Office software fails to properly handle rich text format files in memory.

An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. The file could then, for example, take actions on behalf of the logged-on user with the same permissions as the current user.

Exploitation of this vulnerability 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 vulnerability 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 vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to visit it, typically by getting them to click a link in an instant messenger or email message, and then convince them to open the specially crafted file.

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

This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2015-1641. Microsoft is aware of limited attacks that attempt to exploit this vulnerability.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability. 

 

Multiple Microsoft Office Component Use After Free Vulnerabilities

Remote code execution vulnerabilities exist in Microsoft Office software that are caused when the Office software improperly handles objects in memory while parsing specially crafted Office files. This could corrupt system memory in such a way as to allow an attacker to execute arbitrary code.

An attacker who successfully exploited these 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 complete 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 these 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 a 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 visit it, typically by getting them to click a link in an instant messenger or email message, and then convince them to open the specially crafted file.

The security update addresses the vulnerabilities by correcting how Microsoft Office parses specially crafted files.

Microsoft received information about the vulnerability through coordinated vulnerability disclosure. When this security bulletin was issued, Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers.

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

Vulnerability title

CVE number

Publicly Disclosed

Exploited

Microsoft Office Component Use After Free Vulnerability

CVE-2015-1650

No

No

 

Note that the Preview Pane is an attack vector for the following vulnerabilities:

Vulnerability title

CVE number

Publicly Disclosed

Exploited

Microsoft Office Component Use After Free Vulnerability

CVE-2015-1649

No

No

Microsoft Office Component Use After Free Vulnerability

CVE-2015-1651

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 Outlook App for Mac XSS Vulnerability – CVE-2015-1639

An elevation of privilege vulnerability exists in the Microsoft Outlook for Mac app that is caused when the software improperly sanitizes HTML strings.

An attacker who successfully exploited this vulnerability could read content that the attacker is not authorized to read or use the victim's identity to take actions on the targeted site or application.

Exploitation of this vulnerability requires that a user views specially crafted content, which then could run a script in the context of the user. 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 specially crafted content that is designed to exploit the vulnerability. An attacker would have no way to force users to visit the website. Instead, an attacker would have to convince users to visit it, typically by getting them to click a link in an instant messenger or email message, and then convince them to open the specially crafted file.

The security update addresses the vulnerability by correcting how Microsoft Outlook for Mac sanitizes HTML strings.

Microsoft received information about the vulnerability through coordinated vulnerability disclosure. When this security bulletin was issued, Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

For Security Update Deployment information, see the Microsoft Knowledge Base article referenced here in the Executive Summary.

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information. 

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.

  • V1.0 (April 14, 2015): Bulletin published.
  • V1.1 (April 21, 2015): Revised bulletin to announce a detection change for the 2553428 update for supported editions of Microsoft Word 2010. There were no changes to the update files. Customers who have already successfully updated their systems do not need to take any action.
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