Objavljena je revizija sigurnosne preporuke s oznakom MS11-072, prvotne objavljene 13. rujna 2011., a vezane uz programski paket Microsoft Excel. Ranjivosti su napadaču omogućavale izvršavanje proizvoljnog programskog koda.

Microsoft Security Bulletin MS11-072 - Important
Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2587505)

Published: Tuesday, September 13, 2011 | Updated: Tuesday, October 11, 2011

Version: 1.1
General Information
Executive Summary

This security update resolves five privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted Excel file. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the logged-on 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. Installing and configuring Office File Validation (OFV) to prevent the opening of suspicious files blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-1986 and CVE-2011-1987. See the section, Frequently Asked Questions (FAQ) Related to This Security Update, for more information about how the Office File Validation feature can be configured to block the attack vectors.

This security update is rated Important for all supported editions of Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Office 2007, Microsoft Excel 2010, Microsoft Office 2010, Microsoft Office 2004 for Mac, Microsoft Office 2008 for Mac, and Microsoft Office for Mac 2011; Open XML File Format Converter for Mac; and all supported versions of Microsoft Excel Viewer, Microsoft Office Compatibility Pack, Microsoft Excel Services installed on SharePoint Server 2007, Microsoft Excel Services installed on SharePoint Server 2010, and Microsoft Excel Web App 2010. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The update addresses the vulnerabilities by correcting the way that Microsoft Excel manages objects in memory, indexes an array of memory locations, parses certain records in Excel files, handles a particular type of conditional expression, and conducts bounds checking on array index values. For more information about the vulnerability, 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 in supported editions of Windows XP and Windows Server 2003, see Microsoft Knowledge Base Article 294871. For information about automatic updating in supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, see Understanding Windows automatic updating.

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.

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

Known Issues. Microsoft Knowledge Base Article 2587505 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues. When currently known issues and recommended solutions pertain only to specific releases of this software, this article provides links to further articles.
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Affected and Non-Affected Software

The following software have 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, visit Microsoft Support Lifecycle.

Affected Software

Microsoft Office Suites and Software
Microsoft Office Suite and Other Software	Component	Maximum Security Impact	Aggregate Severity Rating	Bulletins Replaced by this Update
Microsoft Office Suites and Components
Microsoft Office 2003 Service Pack 3	Microsoft Excel 2003 Service Pack 3
(KB2553072)	Remote Code Execution	Important	MS11-045
Microsoft Office 2007 Service Pack 2	Microsoft Excel 2007 Service Pack 2[1]
(KB2553073)	Remote Code Execution	Important	MS11-045
Microsoft Office 2007 Service Pack 2[1]
(KB2553089)

Microsoft Office 2007 Service Pack 2[1]
(KB2553090)	Not applicable	Remote Code Execution	Important	None
Microsoft Office 2010 (32-bit editions)	Microsoft Excel 2010 (32-bit editions)
(KB2553070)	Remote Code Execution	Important	MS11-045
Microsoft Office 2010 Service Pack 1 (32-bit editions)	Microsoft Excel 2010 Service Pack 1 (32-bit editions)
(KB2553070)	Remote Code Execution	Important	None
Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (32-bit editions)
(KB2553091)

Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (32-bit editions)
(KB2553096)	Not applicable	Remote Code Execution	Important	None
Microsoft Office 2010 (64-bit editions)	Microsoft Excel 2010 (64-bit editions)
(KB2553070)	Remote Code Execution	Important	MS11-045
Microsoft Office 2010 Service Pack 1 (64-bit editions)	Microsoft Excel 2010 Service Pack 1 (64-bit editions)
(KB2553070)	Remote Code Execution	Important	None
Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (64-bit editions)
(KB2553091)

Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (64-bit editions)
(KB2553096)	Not applicable	Remote Code Execution	Important	None
Microsoft Office for Mac
Microsoft Office 2004 for Mac
(KB2598782)	Not applicable	Remote Code Execution	Important	MS11-045
Microsoft Office 2008 for Mac
(KB2598781)	Not applicable	Remote Code Execution	Important	MS11-045
Microsoft Office for Mac 2011
(KB2598783)	Not applicable	Remote Code Execution	Important	MS11-045
Open XML File Format Converter for Mac
(KB2598785)	Not applicable	Remote Code Execution	Important	MS11-045
Other Microsoft Office Software
Microsoft Excel Viewer Service Pack 2
(KB2553075)	Not applicable	Remote Code Execution	Important	None
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2
(KB2553074)	Not applicable	Remote Code Execution	Important	MS11-045

[1]For Microsoft Excel 2007 Service Pack 2, in addition to security update package KB2553073, KB2553089, and KB2553090, customers also need to install the security update for Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2 (KB2553074) to be protected from the vulnerabilities described in this bulletin.

Microsoft Server Software
Microsoft SharePoint Server and Microsoft Office Web Apps	Component	Maximum Security Impact	Aggregate Severity Rating	Bulletins Replaced by this Update
Microsoft Excel Services
Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions)	Excel Services[2]
(KB2553093)	Remote Code Execution	Important	MS10-017
Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions)	Excel Services[2]
(KB2553093)	Remote Code Execution	Important	MS10-017
Microsoft Office SharePoint Server 2010 and Microsoft Office SharePoint Server 2010 Service Pack 1	Excel Services
(KB2553094)	Remote Code Execution	Important	None
Microsoft Office Web Apps
Microsoft Office Web Apps 2010 and Microsoft Office Web Apps 2010 Service Pack 1	Microsoft Excel Web App 2010 and Microsoft Excel Web App 2010 Service Pack 1
(KB2553095)	Remote Code Execution	Important	None

[2]This update applies to servers that have Excel Services installed, such as the default configuration of Microsoft Office SharePoint Server 2007 Enterprise and Microsoft Office SharePoint Server 2007 for Internet sites. Microsoft Office SharePoint Server 2007 Standard does not include Excel Services.

Non-Affected Software
Office and Other Software
Microsoft Works 9
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
Excel Use after Free WriteAV Vulnerability - CVE-2011-1986
Excel Out of Bounds Array Indexing Vulnerability - CVE-2011-1987
Excel Heap Corruption Vulnerability - CVE-2011-1988
Excel Conditional Expression Parsing Vulnerability - CVE-2011-1989
Excel Out of Bounds Array Indexing Vulnerability - CVE-2011-1990
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:

    An anonymous researcher, working with VeriSign iDefense Labs, for reporting the Excel Use after Free WriteAV Vulnerability (CVE-2011-1986)
    Sean Larsson of VeriSign iDefense Labs for reporting the Excel Out of Bounds Array Indexing Vulnerability (CVE-2011-1987)
    An anonymous researcher, working with VeriSign iDefense Labs, for reporting the Excel Heap Corruption Vulnerability (CVE-2011-1988)
    An anonymous researcher, working with TippingPoint's Zero Day Initiative, for reporting the Excel Conditional Expression Parsing Vulnerability (CVE-2011-1989)
    Omair, working with TippingPoint's Zero Day Initiative, for reporting the Excel Out of Bounds Array Indexing Vulnerability (CVE-2011-1990)

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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 visit the active protections Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.
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Support

    Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. For more information about available support options, see Microsoft Help and Support.
    International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.

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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.
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Revisions

    V1.0 (September 13, 2011): Bulletin published.
    V1.1 (October 11, 2011): Announced a detection logic change for update KB2553094. There were no changes to the security update files. See the Update FAQ for details.