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Microsoft Security Bulletin MS13-073 - Important

Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2858300)

Published: | Updated:

Version: 1.1

General Information

Executive Summary

This security update resolves three privately reported vulnerabilities in Microsoft Office. The most severe vulnerabilities could allow remote code execution if a user opens a specially crafted Office file with an affected version of Microsoft Excel or other affected Microsoft Office software. An attacker who successfully exploited the most severe vulnerabilities could gain the same user rights as the current user. 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.

This security update is rated Important for all supported editions of Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Excel 2010, Microsoft Excel 2013, Microsoft Excel 2013 RT, and Microsoft Office for Mac 2011; it is also rated Important for supported versions of Microsoft Excel Viewer and Microsoft Office Compatibility Pack. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting how Microsoft Excel and other affected Microsoft software validates data when parsing specially crafted Office files and by correcting the manner in which the XML parser used by Excel resolves external entities within a specially crafted file. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates from Microsoft Update and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.

For customers of Microsoft Office for Mac, Microsoft AutoUpdate for Mac can be configured to deliver updates for Microsoft software directly to your system. For more information, see Check for Office for Mac updates automatically.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Knowledge Base Article

Knowledge Base Article2858300
File informationYes
SHA1/SHA2 hashesYes
Known issuesNone

Affected and Non-Affected Software

The following software has been tested to determine which versions or editions are affected. Other versions or editions 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.

Affected Software

Microsoft Office Suite and Other SoftwareComponentMaximum Security ImpactAggregate Severity RatingUpdates Replaced
Microsoft Office Suites and Components
Microsoft Office 2003 Service Pack 3Microsoft Excel 2003 Service Pack 3
(2810048)
Remote Code ExecutionImportant2687481 in MS12-076
Microsoft Office 2007 Service Pack 3Microsoft Excel 2007 Service Pack 3[1]
(2760583)
Remote Code ExecutionImportant2687307 in MS12-076
Microsoft Office 2010 Service Pack 1 (32-bit editions)Microsoft Excel 2010 Service Pack 1 (32-bit editions)
(2760597)
Remote Code ExecutionImportant2597126 in MS12-076
Microsoft Office 2010 Service Pack 2 (32-bit editions)Microsoft Excel 2010 Service Pack 2 (32-bit editions)
(2760597)
Remote Code ExecutionImportantNone
Microsoft Office 2010 Service Pack 1 (64-bit editions)Microsoft Excel 2010 Service Pack 1 (64-bit editions)
(2760597)
Remote Code ExecutionImportant2597126 in MS12-076
Microsoft Office 2010 Service Pack 2 (64-bit editions)Microsoft Excel 2010 Service Pack 2 (64-bit editions)
(2760597)
Remote Code ExecutionImportantNone
Microsoft Office 2013 (32-bit editions)Microsoft Excel 2013 (32-bit editions)
(2768017)
Remote Code ExecutionImportantNone
Microsoft Office 2013 (64-bit editions)Microsoft Excel 2013 (64-bit editions)
(2768017)
Remote Code ExecutionImportantNone
Microsoft Office 2013 RTMicrosoft Excel 2013 RT[2]
(2768017)
Remote Code ExecutionImportantNone
Microsoft Office for Mac
Microsoft Office for Mac 2011
(2877813)
Not applicableRemote Code ExecutionImportant2848689 in MS13-051
Other Microsoft Office Software
Microsoft Excel Viewer[3]
(2760590)
Not applicableRemote Code ExecutionImportant2687313 in MS12-076
Microsoft Office Compatibility Pack Service Pack 3
(2760588)
Not applicableRemote Code ExecutionImportant2687311 in MS12-076

[1]For Microsoft Office Excel 2007, in addition to security update package 2760583, customers also need to install the security update for Microsoft Office Compatibility Pack (2760588) to be protected from the vulnerabilities described in this bulletin.

[2]This update is available via Windows Update.

[3]Microsoft Excel Viewer must be updated to a supported service pack level (Excel Viewer 2007 Service Pack 3) before installing this update. For information about supported Office viewers, see Microsoft Knowledge Base Article 979860.

 

Update FAQ

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Microsoft Office Memory Corruption Vulnerability - CVE-2013-1315

Microsoft Office Memory Corruption Vulnerability - CVE-2013-3158

XML External Entities Resolution Vulnerability - CVE-2013-3159

Update Information

Detection and Deployment Tools and Guidance

Security Update Deployment

Other Information

Acknowledgments

Microsoft thanks the following for working with us to help protect customers:

  • Will Dormann of the CERT/CC for reporting the Microsoft Office Memory Corruption Vulnerability (CVE-2013-1315)
  • Will Dormann of the CERT/CC for reporting the Microsoft Office Memory Corruption Vulnerability (CVE-2013-3158)
  • Timur Yunusov, Alexey Osipov, and Ilya Karpov of Positive Technologies for reporting the XML External Entities Resolution Vulnerability (CVE-2013-3159)

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please go to the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support

How to obtain help and support for this security update

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 (September 10, 2013): Bulletin published.
  • V1.1 (September 13, 2013): Revised bulletin to announce detection changes for the Microsoft Excel 2003 update (2810048), Microsoft Excel 2007 update (2760583), Microsoft Excel Viewer update (2760590), and Microsoft Office Compatibility Pack update (2760588). These are detection changes only. There were no changes to the update files. Customers who have successfully installed the updates do not need to take any action. Also updated the Known Issues entry in the Knowledge Base Article section from "Yes" to "None".