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From:MICROSOFT <secure_(at)_microsoft.com>
Date:16.09.2010
Subject:Microsoft Security Bulletin MS10-067 - Important Vulnerability in WordPad Text Converters Could Allow Remote Code Execution (2259922)

Microsoft Security Bulletin MS10-067 - Important
Vulnerability in WordPad Text Converters Could Allow Remote Code Execution (2259922)
Published: September 14, 2010

Version: 1.0
General Information
Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Windows. This security update is rated Important for all supported editions of Windows XP and Windows Server 2003. All supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 are not affected by the vulnerability. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The vulnerability could allow remote code execution if a user opened a specially crafted file using WordPad. 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.

The security update addresses the vulnerability by changing the way that the WordPad Text Converters handle specially crafted 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. The majority of customers have automatic updating enabled and 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 and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

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

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

Known Issues. None
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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
Operating System Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update

Windows XP Service Pack 3


Remote Code Execution


Important


None

Windows XP Professional x64 Edition Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 x64 Edition Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 with SP2 for Itanium-based Systems


Remote Code Execution


Important


None

Non-Affected Software
Operating System

Windows Vista Service Pack 1 and Windows Vista Service Pack 2

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2

Windows 7 for 32-bit Systems

Windows 7 for x64-based Systems

Windows Server 2008 R2 for x64-based Systems

Windows Server 2008 R2 for Itanium-based Systems
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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.

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 September bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software WordPad Word 97 Text Converter Memory Corruption Vulnerability - CVE-2010-2563 Aggregate Severity Rating

Windows XP Service Pack 3


Important
Remote Code Execution


Important

Windows XP Professional x64 Edition Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 x64 Edition Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 with SP2 for Itanium-based Systems


Important
Remote Code Execution


Important
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WordPad Word 97 Text Converter Memory Corruption Vulnerability - CVE-2010-2563

A remote code execution vulnerability exists in the way that Microsoft WordPad processes memory when parsing a specially crafted Word 97 document. The vulnerability could allow remote code execution if a user opens a specially crafted Word file that includes a malformed structure.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-2563.

Mitigating Factors for WordPad Word 97 Text Converter Memory Corruption Vulnerability - CVE-2010-2563

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:


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 would have to host a Web site that contains a Web page that is used to exploit this vulnerability. An attacker would have no way to force users to visit a malicious 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. After they click the link, they would be prompted to perform several actions. An attack could only occur after they performed these actions.


The vulnerability could not 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. The user would be prompted to decide if they wanted to open the file or not, unless the user had previously unchecked the option "Always ask before opening this type of file."


Systems where Microsoft Word is installed will typically open Word documents with Microsoft Office instead of WordPad by default.
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Workarounds for WordPad Word 97 Text Converter Memory Corruption Vulnerability - CVE-2010-2563

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:


Disable the WordPad Word 97 text converter by restricting access to the converter file.

An administrator can apply an access control list to affected converters to ensure that the converter is no longer loaded by WordPad. This effectively prevents exploitation of the issue using this attack vector.

Warning Undo this workaround before installing this security update.

In order to apply the access list, log on as administrator and run the following commands from the command prompt.

Note Some of these commands may result in an error message; this is expected if the file you are trying to change permissions for does not exist.

echo y| cacls "%ProgramFiles%\Windows NT\Accessories\mswrd8.wpc" /E /P everyone:N
echo y| cacls "%ProgramFiles%\Windows NT\Accessories\mswrd864.wpc" /E /P everyone:N
echo y| cacls "%ProgramFiles(x86)%\Windows NT\Accessories\mswrd8.wpc" /E /P everyone:N

Impact of workaround. Upon implementing the workaround, opening a Word document in WordPad results in WordPad displaying representations of binary data instead of formatted text.

How to undo the workaround. Log on as administrator and run the following commands from the command prompt.

Note Depending on your operating system version and your history of operating system upgrades and service packs, some of the files referenced below may not exist; this is expected.

echo y| cacls "%ProgramFiles%\Windows NT\Accessories\mswrd8.wpc" /E /R everyone
echo y| cacls "%ProgramFiles%\Windows NT\Accessories\mswrd864.wpc" /E /R everyone
echo y| cacls "%ProgramFiles(x86)%\Windows NT\Accessories\mswrd8.wpc" /E /R everyone

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FAQ for WordPad Word 97 Text Converter Memory Corruption Vulnerability - CVE-2010-2563

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?
The vulnerability is caused when the WordPad text converter incorrectly parses specific fields in a Word 97 document.

What are WordPad Text Converters?
WordPad is a default component of Microsoft Windows operating systems. Text converters in WordPad allow users who do not have Microsoft Word installed to open documents in Microsoft Windows Write (.wri) and Microsoft Word (.doc) file formats.

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?
In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a specially crafted Word 97 file 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 97 document 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 web site. The user will also get prompted and will need to manually accept opening the document.

What systems are primarily at risk from the vulnerability?
Affected systems where WordPad is used to open Word documents from untrusted sources, such as workstations or 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. Systems where Microsoft Word is installed will typically open Word documents with Microsoft Office instead of WordPad by default.

What does the update do?
This update addresses the vulnerability by changing the way that the WordPad Text Converters handle specially crafted files.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability disclosure. Microsoft had not received any information to indicate that this vulnerability had been publicly disclosed when this security bulletin was originally issued.

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 and had not seen any examples of proof of concept code published when this security bulletin was originally issued.

Other Information
Acknowledgments

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


S0lute of iDefense Labs for reporting the WordPad Word 97 Text Converter Memory Corruption Vulnerability (CVE-2010-2563)
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Microsoft Active Protections Program (MAPP)

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

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.
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Revisions


V1.0 (September 14, 2010): Bulletin published.

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