Objavljena je nadogradnja programskih paketa Microsoft Office i Microsoft Excel koja ispravlja višestruke nedostatke. Zlonamjerni korisnici mogu ih iskoristiti za izvršavanje proizvoljnog programskog koda te stjecanje dodatnih ovlasti na ugroženom sustavu.
| Paket: | Microsoft Excel 2002, Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Office 2002, Microsoft Office 2003, Microsoft Office 2004 for Mac, Microsoft Office 2007, Microsoft Office 2008 for Mac, Microsoft Office 2010, Microsoft Office for Mac 2011, Microsoft Office XP |
| Operacijski sustavi: | Microsoft Windows XP, Microsoft Windows Server 2003, Microsoft Windows Vista, Microsoft Windows Server 2008, Microsoft Windows 7 |
| Kritičnost: | 6.9 |
| Problem: | neodgovarajuća provjera ulaznih podataka |
| Iskorištavanje: | lokalno/udaljeno |
| Posljedica: | dobivanje većih privilegija, proizvoljno izvršavanje programskog koda |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-1272, CVE-2011-1273, CVE-2011-1279, CVE-2011-1274, CVE-2011-1275, CVE-2011-1276, CVE-2011-1277, CVE-2011-1278 |
| Izvorni ID preporuke: | MS11-045 |
| Izvor: | Microsoft |
| Problem: | |
| Spomenuti nedostaci posljedica su neodgovarajućeg načina stvaranja zapisa kod obrade posebno oblikovanih Excel datoteka. |
|
| Posljedica: | |
| Zlonamjerni, udaljeni korisnici mogu iskoristiti uočene nedostatke za pokretanje proizvoljnog programskog koda te stjecanje dodatnih ovlasti na ugroženom sustavu. |
|
| Rješenje: | |
| Svim se korisnicima savjetuje primjena nadogradnje. |
|
Izvorni tekst preporuke
Microsoft Security Bulletin MS11-045 - Important
Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2537146)
Published: June 14, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves eight 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-2011-1272, CVE-2011-1273, and CVE-2011-1279. 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. Microsoft Excel 2010 is only affected by CVE-2011-1273 described in this bulletin. The automated Microsoft Fix it solution, "Disable Edit in Protected View for Excel 2010," available in Microsoft Knowledge Base Article 2501584, blocks the attack vectors for exploiting CVE-2011-1273.
This security update is rated Important for all supported editions of Microsoft Excel 2002, Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Excel 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 and Microsoft Office Compatibility Pack. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The update addresses the vulnerabilities by modifying the way that Microsoft Excel validates record information when parsing specially crafted Excel files. 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 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 2537146 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 Suite and Other Software Component Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update
Microsoft Office Suites and Components
Microsoft Office XP Service Pack 3
Microsoft Excel 2002 Service Pack 3
(KB2541003)
Remote Code Execution
Important
MS11-021
Microsoft Office 2003 Service Pack 3
Microsoft Excel 2003 Service Pack 3
(KB2541025)
Remote Code Execution
Important
MS11-021
Microsoft Office 2007 Service Pack 2
Microsoft Excel 2007 Service Pack 2[1]
(KB2541007)
Remote Code Execution
Important
MS11-021
Microsoft Office 2010 (32-bit editions)
Microsoft Excel 2010 (32-bit editions)
(KB2523021)
Remote Code Execution
Important
MS11-021
Microsoft Office 2010 (64-bit editions)
Microsoft Excel 2010 (64-bit editions)
(KB2523021)
Remote Code Execution
Important
MS11-021
Microsoft Office for Mac
Microsoft Office 2004 for Mac
(KB2555786)
Not applicable
Remote Code Execution
Important
MS11-021,
MS11-022
Microsoft Office 2008 for Mac
(KB2555785)
Not applicable
Remote Code Execution
Important
MS11-021,
MS11-022
Microsoft Office for Mac 2011
(KB2555784)
Not applicable
Remote Code Execution
Important
MS11-021,
MS11-022
Open XML File Format Converter for Mac
(KB2555787)
Not applicable
Remote Code Execution
Important
MS11-021
Other Microsoft Office Software
Microsoft Excel Viewer Service Pack 2
(KB2541015)
Not applicable
Remote Code Execution
Important
MS11-021
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2
(KB2541012)
Not applicable
Remote Code Execution
Important
MS11-021
[1]For Microsoft Office Excel 2007 Service Pack 2, in addition to security update package KB2541007, customers also need to install the security update for Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2 (KB2541012) to be protected from the vulnerabilities described in this bulletin.
Non-Affected Software
Office and Other Software
Microsoft Works 9
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Frequently Asked Questions (FAQ) Related to This Security Update
Where are the file information details?
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.
Why is this update only rated Important for all affected versions of Excel?
Microsoft Excel 2002 and later versions have a built-in feature that prompts a user to Open, Save, or Cancel before opening a document. This mitigating factor reduces the vulnerability from Critical to Important because the vulnerability requires more than a single user action to complete the exploit.
How could the Office File Validation feature help to mitigate the vulnerabilities?
When the Office File Validation feature is enabled in Microsoft Excel 2003 and Microsoft Excel 2007, specially crafted files that could be used to exploit the vulnerabilities described in CVE-2011-1272, CVE-2011-1273, and CVE-2011-1279 are not opened automatically; instead, by default, the user is prompted to choose whether or not to open such a file. A user would have to click through the warning to open the file before the vulnerabilities could be exploited. For more information about Office File Validation in Microsoft Excel 2003 or Microsoft Excel 2007, see Microsoft Security Advisory 2501584.
Office File Validation is enabled by default in Microsoft Excel 2010. Specially crafted files that could be used to exploit the vulnerabilities described in CVE-2011-1272, CVE-2011-1273, and CVE-2011-1279 fail validation and open in Protected View; the user then must click through several warning messages before the file can be opened for editing and the vulnerabilities could be exploited.
What is the benefit if I disable the opening of files that fail file validation in Excel 2003 and Excel 2007?
By setting Office File Validation to not allow the opening of suspicious files in Excel 2003 and Excel 2007, the Microsoft Fix it solution, "Disable the opening of documents for Excel 2003 and 2007" available in Microsoft Knowledge Base Article 2501584, blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-1272, CVE-2011-1273, and CVE-2011-1279.
Refer to Microsoft Knowledge Base Article 2501584 for instructions on applying the automated Fix it solution, "Disable the opening of documents for Excel 2003 and 2007," or refer to the Workaround sections for CVE-2011-1272, CVE-2011-1273, and CVE-2011-1279 in the Vulnerability Information section of this bulletin for instructions on applying the solution manually.
What is the benefit if I disable the opening of files that fail file validation in Excel 2010?
Microsoft Excel 2010 is only affected by CVE-2011-1273 described in this bulletin. The automated Microsoft Fix it solution, "Disable Edit in Protected View for Excel 2010," available in Microsoft Knowledge Base Article 2501584, blocks the attack vectors for exploiting CVE-2011-1273. Customers may choose to apply the Fix it solution as a workaround if choosing not to install the security update for Excel 2010 until a later time.
Refer to Microsoft Knowledge Base Article 2501584 for instructions on applying the automated Fix it solution, "Disable Edit in Protected View for Excel 2010," or refer to the Workaround sections for CVE-2011-1273 in the Vulnerability Information section of this bulletin for instructions on applying the solution manually.
Why does this update address several reported security vulnerabilities?
This update contains support for several vulnerabilities because the modifications that are required to address these issues are located in related files. Instead of having to install several updates that are almost the same, customers need to install this update only.
How is this security update related to MS11-036?
The security update packages for Microsoft Office 2004 for Mac (KB2555786), Microsoft Office 2008 for Mac (KB2555785), and Open XML File Format Converter for Mac (KB2555784) offered in this bulletin also address the vulnerabilities described in the MS11-036 security bulletin.
What components of the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats are updated by this bulletin?
The update included with this security bulletin applies only to the specific component within the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats that is affected. For example, in an Excel bulletin, only the Excel compatibility pack component files are included in the update packages and not Word or PowerPoint compatibility pack component files. Word compatibility pack component files are updated in a Word bulletin and PowerPoint compatibility pack component files are updated in a PowerPoint bulletin.
What is the Microsoft Excel Viewer?
The Microsoft Excel Viewer is a replacement for all previous Excel Viewer versions, including Excel Viewer 97 and Excel Viewer 2003. With Excel Viewer, you can open, view, and print Excel workbooks, even if you don't have Excel installed. You can also copy data from Excel Viewer to another program. However, you cannot edit data, save a workbook, or create a new workbook.
How are Microsoft Office standalone programs affected by the vulnerabilities?
A Microsoft Office standalone program is affected with the same severity rating as the corresponding component in a Microsoft Office Suite. For example, a standalone installation of Microsoft Excel is affected with the same severity rating as an installation of Microsoft Excel that was delivered with a Microsoft Office Suite.
The Microsoft Office component discussed in this article is part of the Microsoft Office Suite that I have installed on my system; however, I did not choose to install this specific component. Will I be offered this update?
Yes, if the component discussed in this bulletin was delivered with the version of the Microsoft Office Suite installed on your system, the system will be offered updates for it whether the component is installed or not. The detection logic used to scan for affected systems is designed to check for updates for all components that were delivered with the particular Microsoft Office Suite and to offer the updates to a system. Users who choose not to apply an update for a component that is not installed, but is delivered with their version of the Microsoft Office Suite, will not increase the security risk of that system. On the other hand, users who do choose to install the update will not have a negative impact on the security or performance of a system.
Does the offer to update a non-vulnerable version of Microsoft Office constitute an issue in the Microsoft update mechanism?
No, the update mechanism is functioning correctly in that it detects a lower version of the files on the system than in the update package and thus, offers the update.
I am using an older release of the software discussed in this security bulletin. What should I do?
The affected software listed in this bulletin have been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, visit the Microsoft Support Lifecycle Web site.
It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Lifecycle Supported Service Packs.
Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, visit the Microsoft Worldwide Information Web site, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.
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Vulnerability Information
Severity Ratings and Vulnerability Identifiers
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 June bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Excel Insufficient Record Validation Vulnerability - CVE-2011-1272 Excel Improper Record Parsing Vulnerability - CVE-2011-1273 Excel Out of Bounds Array Access Vulnerability - CVE-2011-1274 Excel Memory Heap Overwrite Vulnerability - CVE-2011-1275 Excel Buffer Overrun Vulnerability - CVE-2011-1276 Excel Memory Corruption Vulnerability - CVE-2011-1277 Excel WriteAV Vulnerability- CVE-2011-1278 Excel Out of Bounds WriteAV Vulnerability - CVE-2011-1279 Aggregate Severity Rating
Microsoft Office Suites and Components
Microsoft Excel 2002 Service Pack 3
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Microsoft Excel 2003 Service Pack 3
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Important
Remote Code Execution
Important
Microsoft Excel 2007 Service Pack 2
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Important
Microsoft Excel 2010 (32-bit editions)
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Important
Microsoft Excel 2010 (64-bit editions)
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Not applicable
Important
Microsoft Office for Mac
Microsoft Office 2004 for Mac
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Important
Remote Code Execution
Important
Microsoft Office 2008 for Mac
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Important
Microsoft Office for Mac 2011
Not applicable
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Not applicable
Important
Open XML File Format Converter for Mac
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Important
Other Microsoft Office Software
Microsoft Excel Viewer Service Pack 2
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Important
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2
Important
Remote Code Execution
Important
Remote Code Execution
Important
Remote Code Execution
Not applicable
Important
Remote Code Execution
Not applicable
Not applicable
Not applicable
Important
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Excel Insufficient Record Validation Vulnerability - CVE-2011-1272
A remote code execution vulnerability exists in the way that Microsoft Excel handles specially crafted Excel files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1272.
Mitigating Factors for Excel Insufficient Record Validation Vulnerability - CVE-2011-1272
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
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