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From:MICROSOFT <secure_(at)_microsoft.com>
Date:13.10.2010
Subject:Microsoft Security Bulletin MS10-079 - Important Vulnerabilities in Microsoft Word Could Allow Remote Code Execution (2293194)

Microsoft Security Bulletin MS10-079 - Important
Vulnerabilities in Microsoft Word Could Allow Remote Code Execution (2293194)
Published: October 12, 2010

Version: 1.0
General Information
Executive Summary

This security update resolves eleven privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted Word file. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the local 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 Word 2002, Microsoft Word 2003, Microsoft Word 2007, Microsoft Word 2010, Microsoft Office 2004 for Mac, and Microsoft Office 2008 for Mac; Open XML File Format Converter for Mac; and all supported versions of Microsoft Office Word 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 Office Word parses specially crafted Word files. 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. Microsoft recommends that customers apply the update at the earliest opportunity.

Known Issues. Microsoft Knowledge Base Article 2293194 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 and Other Productivity 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 Word 2002 Service Pack 3
(KB2328360)


Remote Code Execution


Important


MS10-056

Microsoft Office 2003 Service Pack 3


Microsoft Word 2003 Service Pack 3
(KB2344911)


Remote Code Execution


Important


MS10-056

Microsoft Office 2007 Service Pack 2


Microsoft Word 2007 Service Pack 2[1]
(KB2344993)


Remote Code Execution


Important


MS10-056

Microsoft Office 2010 (32-bit editions)


Microsoft Word 2010 (32-bit editions)
(KB2345000)


Remote Code Execution


Important


None

Microsoft Office 2010 (64-bit editions)


Microsoft Word 2010 (64-bit editions)
(KB2345000)


Remote Code Execution


Important


None
Microsoft Office for Mac

Microsoft Office 2004 for Mac
(KB2422343)


Not applicable


Remote Code Execution


Important


MS10-056

Microsoft Office 2008 for Mac
(KB2422352)


Not applicable


Remote Code Execution


Important


MS10-056

Open XML File Format Converter for Mac
(KB2422398)


Not applicable


Remote Code Execution


Important


MS10-056
Other Microsoft Office Software

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2
(KB2345043)


Not applicable


Remote Code Execution


Important


MS10-056

Microsoft Word Viewer
(KB2345009)


Not applicable


Remote Code Execution


Important


MS09-068

Microsoft Server Software
Microsoft Office Web Apps Component Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update

Microsoft Office Web Apps[2]
(KB2346411)


Not applicable


Remote Code Execution


Important


None

Microsoft Office Web Apps


Microsoft Word Web App[2]
(KB2345015)


Remote Code Execution


Important


None

[1]For Microsoft Word 2007 Service Pack 2, in addition to security update package KB2344993, customers also need to install the security update for Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2 (KB2345043) to be protected from the vulnerabilities described in this bulletin.

[2]For Microsoft Office Web Apps, customers need to install both security update KB2346411 and security update KB2345015 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 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.

MS10-072 also describes vulnerabilities in Microsoft Office Web Apps. How does MS10-072 relate to this bulletin (MS10-079)?
The security update package in this bulletin, MS10-079, for Microsoft Office Web Apps (KB2346411) also addresses the vulnerabilities described in MS10-072. Users with Microsoft Office Web Apps installed will only need to install the KB2346411 security update package once.

MS10-080 also describes vulnerabilities in Microsoft Office 2004 for Mac, Microsoft Office 2008 for Mac, and Open XML File Format Converter for Mac. How does MS10-080 relate to this bulletin (MS10-079)?
The security update packages in this bulletin, MS10-079, for Microsoft Office 2004 for Mac (KB2422343), Microsoft Office 2008 for Mac (KB2422352), and Open XML File Format Converter for Mac (KB2422398) also address the vulnerabilities described in MS10-080. Users with Microsoft Office 2004 for Mac, Microsoft Office 2008 for Mac, or Open XML File Format Converter for Mac installed will only need to install these security update packages once.

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 Word Viewer?
The Microsoft Word Viewer is a replacement for Word Viewer 2003 and all previous Word Viewer versions. With Word Viewer, you can view, print, and copy Word documents, even if you do not have Word installed. For more details about currently supported Office viewers, see Supported versions of the Office viewers.

What is Microsoft Office Web Apps?
Microsoft Office Web Apps is the online companion to Office Word, Excel, PowerPoint and OneNote applications that enables users regardless of their location to access documents and edit documents. Users can view, share, and work on documents with others online across personal computers, mobile phones, and the Web. Office Web Apps is available to business customers with Microsoft Office 2010 volume licensing and document management solutions based on Microsoft SharePoint 2010 products.

What is Microsoft Word Web App?
Microsoft Word Web App is part of Microsoft Office Web Apps, available in organizations that have configured Office Web Apps on Microsoft SharePoint Server 2010. Word Web App extends your Microsoft Word experience to the Web browser, where you can work with documents directly on the website where the document is stored. For more information about Word Web App, see Introduction to Word Web App.

Where are updates for Microsoft Office Web Apps applied?
Customers who have deployed Microsoft Office Web Apps in a SharePoint environment will need to apply the updates for Microsoft Office Web Apps on the servers on which those components are installed. For more information about deploying Microsoft Web Apps, see the Microsoft TechNet article, Understanding Office Web Apps.

Note The updates for Microsoft Office Web Apps do not apply to the client workstations that use a Web browser to access Microsoft Office Web Apps.

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 Word is affected with the same severity rating as an installation of Microsoft Word 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 October bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Word Uninitialized Pointer Vulnerability - CVE-2010-2747 Word Boundary Check Vulnerability - CVE-2010-2748 Word Index Vulnerability - CVE-2010-2750 Word Stack Overflow Vulnerability - CVE-2010-3214 Word Return Value Vulnerability - CVE-2010-3215 Word Bookmarks Vulnerability - CVE-2010-3216 Word Pointer Vulnerability - CVE-2010-3217 Word Heap Overflow Vulnerability - CVE-2010-3218 Word Index Parsing Vulnerability - CVE-2010-3219 Word Parsing Vulnerability - CVE-2010-3220 Word Parsing Vulnerability - CVE-2010-3221 Aggregate Severity Rating
Microsoft Office Suites and Components

Microsoft Word 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
Remote Code Execution


Important
Remote Code Execution


Important
Remote Code Execution


Important

Microsoft Word 2003 Service Pack 3


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Important

Microsoft Word 2007 Service Pack 2


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important

Microsoft Word 2010 (32-bit editions)


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important

Microsoft Word 2010 (64-bit editions)


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


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


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Important
Remote Code Execution


Important

Microsoft Office 2008 for Mac


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important

Open XML File Format Converter for Mac


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important
Other Microsoft Office Software

Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important

Microsoft Word Viewer


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Important
Other Productivity Software

Microsoft Office Web Apps


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important

Microsoft Word Web App


Not applicable


Not applicable


Not applicable


Important
Remote Code Execution


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Not applicable


Important
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Word Uninitialized Pointer Vulnerability - CVE-2010-2747

A remote code execution vulnerability exists in the way that Microsoft Word handles an uninitialized pointer when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-2747.

Mitigating Factors for Word Uninitialized Pointer Vulnerability - CVE-2010-2747

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
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Workarounds for Word Uninitialized Pointer Vulnerability - CVE-2010-2747

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
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FAQ for Word Uninitialized Pointer Vulnerability - CVE-2010-2747

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Word Boundary Check Vulnerability - CVE-2010-2748

A remote code execution vulnerability exists in the way that Microsoft Word handles an improper boundary check when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-2748.

Mitigating Factors for Word Boundary Check Vulnerability - CVE-2010-2748

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
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Workarounds for Word Boundary Check Vulnerability - CVE-2010-2748

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Boundary Check Vulnerability - CVE-2010-2748

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, an improper boundary check may cause system memory to become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Word Index Vulnerability - CVE-2010-2750

A remote code execution vulnerability exists in the way that Microsoft Word handles index values inside a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-2750.

Mitigating Factors for Word Index Vulnerability - CVE-2010-2750

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
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Workarounds for Word Index Vulnerability - CVE-2010-2750

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Index Vulnerability - CVE-2010-2750

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file that contains a malformed index value, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Word Stack Overflow Vulnerability - CVE-2010-3214

A remote code execution vulnerability exists in the way that Microsoft Word handles stack validation when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3214.

Mitigating Factors for Word Stack Overflow Vulnerability - CVE-2010-3214

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
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Workarounds for Word Stack Overflow Vulnerability - CVE-2010-3214

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Use Microsoft Office File Block policy to block the opening of Office 2003 and earlier documents from unknown or untrusted sources and locations

The following registry scripts can be used to set the File Block policy.

Note Modifying the Registry incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from incorrect modification of the Registry can be solved. Modify the Registry at your own risk.

For Office 2003

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Office\11.
0\Word\Security\FileOpenBlock]

"BinaryFiles"=dword:00000001

Note In order to use 'FileOpenBlock' with Microsoft Office 2003, all of the latest security updates for Microsoft Office 2003 must be applied.

For Office 2007

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.
0\Word\Security\FileOpenBlock]

"BinaryFiles"=dword:00000001

Note In order to use 'FileOpenBlock' with the 2007 Microsoft Office system, all of the latest security updates for the 2007 Microsoft Office system must be applied.

For Office 2010

Open Word 2010 and follow the steps below:

1.


Click the File tab.

2.


Under Help, click Options.

3.


Click TrustCenter, and then click Trust Center Settings.

4.


In the Trust Center, click File Block Settings.

5.


Ensure the Open check box is selected for the following file types:
- Word 2003 Binary Documents and Templates
- Word XP Binary Documents and Templates
- Word 2000 Binary Documents and Templates
- Word 97 Binary Documents and Templates
- Word 95 Binary Documents and Templates
- Word 6.0 Binary Documents and Templates
- Word 2 and earlier Binary Documents and Templates

6.


Under Open behavior for selected file types, select "Do not open selected file types" or select "Open selected file types in Protected View" (either choice will block the attack vector to the vulnerable code).

7.


Click OK to apply the File Block Settings.

Alternatively, file block can be applied using Group Policy. For more information, see the TechNet article, Plan file block settings for Office 2010.

Impact of workaround. For Microsoft Office 2003 and Microsoft Office 2007, users who have configured the File Block policy and have not configured a special "exempt directory" as discussed in Microsoft Knowledge Base Article 922848 will be unable to open Office 2003 files or earlier versions. For Microsoft Office 2007, Office 2003 or earlier versions will either be blocked from opening or will be opened in protected mode depending on the open behavior that was selected.

How to undo the workaround.

For Office 2003

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Office\11.
0\Word\Security\FileOpenBlock]

"BinaryFiles"=dword:00000000

For Office 2007

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\12.
0\Word\Security\FileOpenBlock]

"BinaryFiles"=dword:00000000

For Office 2010

Open Word 2010 and follow these steps:

1.


Click the File tab.

2.


Under Help, click Options.

3.


Click TrustCenter, and then click Trust Center Settings.

4.


In the Trust Center, click File Block Settings.

5.


Clear the Open check box for the file types that you previously selected.

6.


Click OK to apply the File Block settings.


Use the Microsoft Office Isolated Conversion Environment (MOICE) when opening files from unknown or untrusted sources

The Microsoft Office Isolated Conversion Environment (MOICE) helps protect Office 2003 installations by more securely opening Word, Excel, and PowerPoint binary format files.

To install MOICE, you must have Office 2003 or Office 2007 installed.

To install MOICE, you must also have the Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats. The compatibility pack is available as a free download from the Microsoft Download Center:

Download the FileFormatConverters.exe package now

MOICE requires all updates that are recommended for all Office programs. Visit Microsoft Update to install all recommended updates:

http://update.microsoft.com/microsoftupdate/v6/default.aspx?ln=en-us

Enable MOICE

Note See Microsoft Knowledge Base Article 935865 to use the automated Microsoft Fix it solution to enable or disable this workaround.

To manually enable MOICE, run the commands as specified in the following table. Running the commands will associate the Office application extensions with MOICE.
Command to enable MOICE to be the registered handler

For Word, run the following command from a command prompt:
ASSOC .doc=oice.word.document

For Excel, run the following commands from a command prompt:
ASSOC .XLS=oice.excel.sheet
ASSOC .XLT=oice.excel.template
ASSOC .XLA=oice.excel.addin

For PowerPoint, run the following commands from a command prompt:
ASSOC .PPT=oice.powerpoint.show
ASSOC .POT=oice.powerpoint.template
ASSOC .PPS=oice.powerpoint.slideshow

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.

For more information on MOICE, see Microsoft Knowledge Base Article 935865.

Impact of workaround. Office 2003 and earlier formatted documents that are converted to the Microsoft Office 2007 Open XML format by MOICE will not retain macro functionality. Additionally, documents with passwords or that are protected with Digital Rights Management cannot be converted.

How to undo the workaround. Run the commands to disable MOICE as specified in the table below.
Command to disable MOICE as the registered handler

For Word, run the following command from a command prompt:
ASSOC .doc=Word.Document.8

For Excel, run the following commands from a command prompt:
ASSOC .xls=Excel.Sheet.8
ASSOC .xlt=Excel.Template
ASSOC .xla=Excel.Addin

For PowerPoint, run the following commands from a command prompt:
ASSOC .ppt=PowerPoint.Show.8
ASSOC .PPS=oice.powerpoint.slideshow
ASSOC .pps=PowerPoint.SlideShow.8

Note On Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, run the above commands from an elevated command prompt.


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Stack Overflow Vulnerability - CVE-2010-3214

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Word Return Value Vulnerability - CVE-2010-3215

A remote code execution vulnerability exists in the way that Microsoft Word handles return values when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3215.

Mitigating Factors for Word Return Value Vulnerability - CVE-2010-3215

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Return Value Vulnerability - CVE-2010-3215

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Return Value Vulnerability - CVE-2010-3215

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section

Word Bookmarks Vulnerability - CVE-2010-3216

A remote code execution vulnerability exists in the way that Microsoft Word handles bookmarks when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3216.

Mitigating Factors for Word Bookmarks Vulnerability - CVE-2010-3216

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Bookmarks Vulnerability - CVE-2010-3216

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Bookmarks Vulnerability - CVE-2010-3216

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file that contains bookmarks, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section

Word Pointer Vulnerability - CVE-2010-3217

A remote code execution vulnerability exists in the way that Microsoft Word handles pointers when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3217.

Mitigating Factors for Word Pointer Vulnerability - CVE-2010-3217

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Pointer Vulnerability - CVE-2010-3217

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Pointer Vulnerability - CVE-2010-3217

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section

Word Heap Overflow Vulnerability - CVE-2010-3218

A remote code execution vulnerability exists in the way that Microsoft Word handles malformed records inside a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3218.

Mitigating Factors for Word Heap Overflow Vulnerability - CVE-2010-3218

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Heap Overflow Vulnerability - CVE-2010-3218

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Heap Overflow Vulnerability - CVE-2010-3218

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section

Word Index Parsing Vulnerability - CVE-2010-3219

A remote code execution vulnerability exists in the way that Microsoft Word handles indexes when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3219.

Mitigating Factors for Word Index Parsing Vulnerability - CVE-2010-3219

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Index Parsing Vulnerability - CVE-2010-3219

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Index Parsing Vulnerability - CVE-2010-3219

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section

Word Parsing Vulnerability - CVE-2010-3220

A remote code execution vulnerability exists in the way that Microsoft Word parses a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3220.

Mitigating Factors for Word Parsing Vulnerability - CVE-2010-3220

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
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Workarounds for Word Parsing Vulnerability - CVE-2010-3220

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
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FAQ for Word Parsing Vulnerability - CVE-2010-3220

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may be corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Word Parsing Vulnerability - CVE-2010-3221

A remote code execution vulnerability exists in the way that Microsoft Word handles a malformed record when parsing a specially crafted Word file. 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. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3221.

Mitigating Factors for Word Parsing Vulnerability - CVE-2010-3221

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:


The vulnerability cannot be exploited automatically through e-mail. For an attack to be successful, a user must open an attachment that is sent in an e-mail message.


An attacker who successfully exploited this vulnerability could gain the same user rights as the local 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.


In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site, and then convince them to open the specially crafted Word file.
Top of sectionTop of section

Workarounds for Word Parsing Vulnerability - CVE-2010-3221

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


Do not open Word documents from untrusted sources

Do not open or save Word files that you receive from untrusted sources or that you receive unexpectedly from trusted sources. This vulnerability could be exploited when a user opens a specially crafted file.
Top of sectionTop of section

FAQ for Word Parsing Vulnerability - CVE-2010-3221

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
When Microsoft Word parses a specially crafted Word file, system memory may become corrupted in such a way that an attacker could execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code as the logged-on user. If a 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.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Word file with an affected version of Microsoft Word.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word document to the user and by convincing the user to open the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Word file that is used to attempt to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content could contain specially crafted content that could exploit this vulnerability. An attacker would have no way to force users to visit a specially crafted Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker's site, and then convince them to open the specially crafted Word file.

What systems are primarily at risk from the vulnerability?
Systems where Microsoft Word is used, including workstations and terminal servers, are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
This update addresses the vulnerability by modifying the way that Microsoft Word parses specially crafted Word files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.

Other Information
Acknowledgments

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


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Uninitialized Pointer Vulnerability (CVE-2010-2747)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Boundary Check Vulnerability (CVE-2010-2748)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Index Vulnerability (CVE-2010-2750)


Nicolas Joly of VUPEN Vulnerability Research Team for reporting the Word Stack Overflow Vulnerability (CVE-2010-3214)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Return Value Vulnerability (CVE-2010-3215)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Bookmarks Vulnerability (CVE-2010-3216)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Pointer Vulnerability (CVE-2010-3217)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Heap Overflow Vulnerability (CVE-2010-3218)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Index Parsing Vulnerability (CVE-2010-3219)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Parsing Vulnerability (CVE-2010-3220)


Chaouki Bekrar of VUPEN Vulnerability Research Team for reporting the Word Parsing Vulnerability (CVE-2010-3221)

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.

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.

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 (October 12, 2010): Bulletin published.

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