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  Microsoft Windows GDI code execution

From:MICROSOFT <secure_(at)_microsoft.com>
Date:11.11.2009
Subject:Microsoft Security Bulletin MS09-065 - Critical Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (969947)

Microsoft Security Bulletin MS09-065 - Critical
Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (969947)
Published: November 10, 2009

Version: 1.0
General Information
Executive Summary

This security update resolves several privately reported vulnerabilities in the Windows kernel. The most severe of the vulnerabilities could allow remote code execution if a user viewed content rendered in a specially crafted Embedded OpenType (EOT) font. In a Web-based attack scenario, an attacker would have to host a Web site that contains specially crafted embedded fonts that are 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 the user to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes the user to the attacker's site.

This security update is rated Critical for all supported editions of Microsoft Windows 2000, Windows XP, and Windows Server 2003, and Important for all supported editions of Windows Vista and Windows Server 2008. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerabilities by correcting the method used for validating the argument passed to the system call, validating input passed from user mode through the kernel component of GDI, and correcting the manner in which Windows kernel-mode drivers parse font code. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. 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 immediately 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

Microsoft Windows 2000 Service Pack 4


Remote Code Execution


Critical


MS09-025

Windows XP Service Pack 2 and Windows XP Service Pack 3


Remote Code Execution


Critical


MS09-025

Windows XP Professional x64 Edition Service Pack 2


Remote Code Execution


Critical


MS09-025

Windows Server 2003 Service Pack 2


Remote Code Execution


Critical


MS09-025

Windows Server 2003 x64 Edition Service Pack 2


Remote Code Execution


Critical


MS09-025

Windows Server 2003 with SP2 for Itanium-based Systems


Remote Code Execution


Critical


MS09-025

Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2


Elevation of Privilege


Important


MS09-025

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


Elevation of Privilege


Important


MS09-025

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


Elevation of Privilege


Important


MS09-025

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


Elevation of Privilege


Important


MS09-025

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


Elevation of Privilege


Important


MS09-025

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the MSDN articles, Server Core and Server Core for Windows Server 2008 R2. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.

Non-Affected Software
Operating System

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.

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.

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 November bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Win32k NULL Pointer Dereferencing Vulnerability - CVE-2009-1127 Win32k Insufficient Data Validation Vulnerability - CVE-2009-2513 Win32k EOT Parsing Vulnerability - CVE-2009-2514 Aggregate Severity Rating

Microsoft Windows 2000 Service Pack 4


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows XP Service Pack 2 and Windows XP Service Pack 3


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows XP Professional x64 Edition Service Pack 2


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows Server 2003 Service Pack 2


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows Server 2003 x64 Edition Service Pack 2


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows Server 2003 with SP2 for Itanium-based Systems


Important
Elevation of Privilege


Important
Elevation of Privilege


Critical
Remote Code Execution


Critical

Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2


Important
Elevation of Privilege


Important
Elevation of Privilege


Not applicable


Important

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


Important
Elevation of Privilege


Important
Elevation of Privilege


Not applicable


Important

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


Important
Elevation of Privilege


Important
Elevation of Privilege


Not applicable


Important

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


Important
Elevation of Privilege


Important
Elevation of Privilege


Not applicable


Important

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


Important
Elevation of Privilege


Important
Elevation of Privilege


Not applicable


Important

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 and Windows Server 2008 R2, whether or not installed using the Server Core installation option. For more information on this installation option, see the MSDN articles, Server Core and Server Core for Windows Server 2008 R2. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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Win32k NULL Pointer Dereferencing Vulnerability - CVE-2009-1127

An elevation of privilege vulnerability exists because the Windows kernel does not properly validate an argument passed to a Windows kernel system call. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-1127.

Mitigating Factors for Win32k NULL Pointer Dereferencing Vulnerability - CVE-2009-1127

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 must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k NULL Pointer Dereferencing Vulnerability - CVE-2009-1127

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k NULL Pointer Dereferencing Vulnerability - CVE-2009-1127

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and 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.

What causes the vulnerability?
The Windows kernel does not properly validate an argument passed to a system call.

What is the Win32k kernel-mode driver?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
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?
The update addresses this vulnerability by correcting the method used for validating the argument passed to the system call.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible 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 and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Win32k Insufficient Data Validation Vulnerability - CVE-2009-2513

An elevation of privilege vulnerability exists in Windows kernel-mode drivers due to improper validation of input passed from user mode through the kernel component of GDI. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-2513.

Mitigating Factors for Win32k Insufficient Data Validation Vulnerability - CVE-2009-2513

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 must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Win32k Insufficient Data Validation Vulnerability - CVE-2009-2513

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Win32k Insufficient Data Validation Vulnerability - CVE-2009-2513

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code and 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.

What causes the vulnerability?
Windows kernel-mode drivers do not properly validate input passed from user mode through the kernel component of GDI.

What is the Win32k kernel-mode driver?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What is GDI?
The Microsoft Windows graphics device interface (GDI) enables applications to use graphics and formatted text on both the video display and the printer. Windows-based applications do not access the graphics hardware directly. Instead, GDI interacts with device drivers on behalf of applications. For more information about GDI, see the MSDN article, Windows GDI.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.

What systems are primarily at risk from the vulnerability?
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?
The update addresses the vulnerability by validating input passed from user mode through the kernel component of GDI.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible 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 and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Win32k EOT Parsing Vulnerability - CVE-2009-2514

A remote code execution vulnerability exists in the Windows kernel-mode drivers due to the improper parsing of font code when building a table of directory entries. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-2514.

Mitigating Factors for Win32k EOT Parsing Vulnerability - CVE-2009-2514

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:


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.


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.
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Workarounds for Win32k EOT Parsing Vulnerability - CVE-2009-2514

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 support for parsing embedded fonts in Internet Explorer

Note See Microsoft Knowledge Base Article 969947 to use the automated Microsoft Fix it solution to enable or disable this workaround.

Disabling the support for the parsing of embedded fonts in Internet Explorer prevents this application from being used as an attack vector. However, additional attack vectors, such as embedded fonts within a Microsoft Office document, could still be exploited.

Using the Interactive Method

1.


In Internet Explorer, click Internet Options on the Tools menu.

2.


Click the Security tab.

3.


Click Internet, and then click Custom Level.

4.


Scroll down to the Downloads section and select Prompt or Disable for the Font Downloading security setting.

5.


Click OK two times to return to Internet Explorer.

Using Group Policy

Note The Group Policy MMC snap-in can be used to set policy for a machine, for an organizational unit or an entire domain. For more information about Group Policy, visit the following Microsoft Web sites:


Group Policy collection


What is Group Policy Object Editor?


Core Group Policy tools and settings

Perform the following steps:

1.


Open the Group Policy Management Console and configure it to work with the appropriate Group Policy object (e.g., local machine, OU or domain GPO).

2.


Navigate to the following node:

User Configuration - Windows Settings - Internet Explorer - Maintenance - Security

3.


Double-click Security Zones and Content Rating.

4.


In the Security Zones and Content Rating dialog box, select Import the current security zones and privacy settings and then click the Modify Settings button.

Note This will create a Group Policy for Internet Explorer based on the settings of the currently logged-on user.

5.


In the Internet Properties dialog box, ensure the Internet zone is selected and then press Custom Level.

6.


Scroll down to Downloads and set Font Download to Prompt or Disable.

7.


Click OK to return to the Internet Properties dialog box.

8.


Repeat these steps for the Local Intranet zone.

9.


Click OK three times to return to the Group Policy Management Console.

10.


Refresh the Group Policy on all machines or wait for the next scheduled Group Policy refresh interval for the settings to take effect.

Using a Managed Deployment Script

This security setting can be manually entered into the registry by creating a registry script and importing it either by double-clicking it or running regedit.exe as part of a logon or machine startup script. For managed deployments Regedit.exe can be used to import a registry script silently with the '-s' switch. For more information on regedit command line switches, see Microsoft Knowledge Base Article 82821, "Registration Info Editor (REGEDIT) Command-Line Switches."

To set this setting to 'Prompt' for the Internet and Local Intranet Zones paste the following text into a .REG file and then import the .REG file on managed machines as part of your organization's managed deployment process:

Windows Registry Editor Version 5.00

; Zone 1 is the local intranet zone
; 1604 is the Font download policy
; dword:00000001 sets the policy to prompt
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Internet Settings\Zones\1]
"1604"=dword:00000001
; Zone 3 is the internet zone
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Internet Settings\Zones\3]
"1604"=dword:00000001

To set this setting to 'Disable' for the Internet and Local Intranet Zones paste the following text into a .REG file and then import the .REG file on managed machines as part of your organization's managed deployment process:

Windows Registry Editor Version 5.00

; Zone 1 is the local intranet zone
; 1604 is the Font download policy
; dword:00000003 sets the policy to disable
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Internet Settings\Zones\1]
"1604"=dword:00000003
; Zone 3 is the internet zone
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
Internet Settings\Zones\3]
"1604"=dword:00000003

Impact of workaround. Web sites making use of embedded font technology will fail to display properly.


Deny Access to T2EMBED.DLL

On Windows 2000, Windows XP, and Windows Server 2003:

For 32-bit systems, enter the following command at an administrative command prompt:

Echo y| cacls "%windir%\system32\t2embed.dll" /E /P everyone:N

For 64-bit systems, enter the following command from an administrative command prompt:

Echo y| cacls "%windir%\syswow64\t2embed.dll" /E /P everyone:N

On Windows Vista and Windows Server 2008:

For 32-bit systems, enter the following command at an administrative command prompt:

Takeown.exe /f "%windir%\system32\t2embed.dll"
Icacls.exe "%windir%\system32\t2embed.dll" /save %TEMP%\t2embed_ACL.TXT
Icacls.exe "%windir%\system32\t2embed.dll" /deny everyone:(F)

For 64-bit systems, enter the following command at an administrative command prompt:

Takeown.exe /f "%windir%\syswow64\t2embed.dll"
Icacls.exe "%windir%\syswow64\t2embed.dll" /save %TEMP%\t2embed_ACL.TXT
Icacls.exe "%windir%\syswow64\t2embed.dll" /deny everyone:(F)

Impact of workaround. Applications that rely on embedded font technology will fail to display properly.

How to undo the workaround.

On Windows 2000, Windows XP, and Windows Server 2003:

For 32-bit systems, enter the following command at an administrative command prompt:

cacls "%windir%\system32\t2embed.dll" /E /R everyone

For 64-bit systems, enter the following command at an administrative command prompt:

cacls "%windir%\syswow64\t2embed.dll" /E /R everyone

On Windows Vista and Windows Server 2008:

For 32-bit systems, enter the following command at an administrative command prompt:

Icacls.exe "%windir%\system32" /restore %TEMP%\t2embed_ACL.TXT

For 64-bit systems, enter the following command at an administrative command prompt:

Icacls.exe "%windir%\syswow64" /restore %TEMP%\t2embed_ACL.TXT

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FAQ for Win32k EOT Parsing Vulnerability - CVE-2009-2514

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. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
The Windows kernel-mode drivers do not properly parse font code when building a table of directory entries.

What is the Win32k kernel-mode driver?
Win32k.sys is a kernel-mode device driver and is the kernel part of the Windows subsystem. It contains the window manager, which controls window displays; manages screen output; collects input from the keyboard, mouse, and other devices; and passes user messages to applications. It also contains the Graphics Device Interface (GDI), which is a library of functions for graphics output devices. Finally, it serves as a wrapper for DirectX support that is implemented in another driver (dxgkrnl.sys).

What is the Windows kernel?
The Windows kernel is the core of the operating system. It provides system-level services such as device management and memory management, allocates processor time to processes, and manages error handling.

What are Embedded OpenType (EOT) Fonts?
Embedded OpenType (EOT) fonts are a compact form of fonts designed for use on Web pages. These fonts can be embedded in a document. Use of EOT fonts ensures that a user views the document exactly as the author intended. The Web Embedding Fonts Tool (WEFT) lets Web authors create font objects that are linked to their Web pages so that when viewed through the browser, pages display in the style contained in the font object. For more information, see MSDN article, About Font Embedding. All platforms listed in the Affected Software table support the rendering of EOT fonts by default.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

How could an attacker exploit the vulnerability?
This vulnerability requires that a user view content rendered in a specially crafted EOT font.

In an e-mail attack scenario, an attacker could exploit the vulnerability by sending an e-mail message with an attached Microsoft Word or PowerPoint file containing a specially crafted EOT font embedded in the document and convincing the user to open or preview the file.

In a Web-based attack scenario, an attacker would have to host a Web site that contains specially crafted embedded fonts that are 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 in an e-mail message or Instant Messenger message that takes them to the attacker's site.

What systems are primarily at risk from the vulnerability?
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?
The update addresses the vulnerability by correcting the manner in which Windows kernel-mode drivers parse font code.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
While the initial report was provided through responsible disclosure, the vulnerability was later disclosed publicly by a separate party. This security bulletin addresses the publicly disclosed vulnerability as well as additional issues discovered through internal investigations.

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:


Agin Sun for reporting the Win32k NULL Pointer Dereferencing Vulnerability (CVE-2009-1127)


Tavis Ormandy of Google Inc. for reporting the Win32k EOT Parsing Vulnerability (CVE-2009-2514)
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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.

Revisions


V1.0 (November 10, 2009): Bulletin published.

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