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Microsoft Security Bulletin MS13-056 - Critical

Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution (2845187)

Published: July 09, 2013

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a specially crafted image file. 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.

This security update is rated Critical for all supported editions of Windows XP, Windows Server 2003, Windows Vista, Windows Server 2008 (except Itanium-based editions), Windows 7, Windows Server 2008 R2 (except Itanium-based editions), Windows 8, and Windows Server 2012. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by correcting how DirectShow opens GIF 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. Most 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.

Knowledge Base Article

Knowledge Base Article 2845187
File informationYes
SHA1/SHA2 hashesYes
Known issuesNone

Affected and Non-Affected Software

The following software has 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, see Microsoft Support Lifecycle.

Affected Software 

Operating SystemMaximum Security ImpactAggregate Severity RatingUpdates Replaced
Windows XP
Windows XP Service Pack 3
(2845187)
Remote Code ExecutionCriticalNone
Windows XP Professional x64 Edition Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2003
Windows Server 2003 Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2003 x64 Edition Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2003 with SP2 for Itanium-based Systems
(2845187)
Remote Code ExecutionCriticalNone
Windows Vista
Windows Vista Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Vista x64 Edition Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2008 for x64-based Systems Service Pack 2
(2845187)
Remote Code ExecutionCriticalNone
Windows 7
Windows 7 for 32-bit Systems Service Pack 1
(2845187)
Remote Code ExecutionCriticalNone
Windows 7 for x64-based Systems Service Pack 1
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2845187)
Remote Code ExecutionCriticalNone
Windows 8
Windows 8 for 32-bit Systems
(2845187)
Remote Code ExecutionCriticalNone
Windows 8 for 64-bit Systems
(2845187)
Remote Code ExecutionCriticalNone
Windows Server 2012
Windows Server 2012
(2845187)
Remote Code ExecutionCriticalNone

 

Non-Affected Software

Operating System
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows RT
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2012 (Server Core installation)

How are Server Core installations affected by the vulnerabilities addressed in this bulletin? 
The vulnerabilities addressed by this update do not affect supported editions of Windows Server 2008, Windows Server 2008 R2, and Windows Server 2012, as indicated in the Non-Affected Software table, when installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation: Overview, Servicing a Server Core Installation, and Server Core and Full Server Integration Overview.

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 has been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, see the Microsoft Support Lifecycle website.

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 Service Pack Lifecycle Support Policy.

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, see the Microsoft Worldwide Information website, 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.

Vulnerability Information

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 July bulletin summary. For more information, see Microsoft Exploitability Index.

Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected SoftwareDirectShow Arbitrary Memory Overwrite Vulnerability - CVE-2013-3174Aggregate Severity Rating
Windows XP
Windows XP Service Pack 3
(2845187)
Critical 
Remote Code Execution
Critical
Windows XP Professional x64 Edition Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2003
Windows Server 2003 Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2003 x64 Edition Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2003 with SP2 for Itanium-based Systems
(2845187)
Critical 
Remote Code Execution
Critical
Windows Vista
Windows Vista Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Vista x64 Edition Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2008 for x64-based Systems Service Pack 2
(2845187)
Critical 
Remote Code Execution
Critical
Windows 7
Windows 7 for 32-bit Systems Service Pack 1
(2845187)
Critical 
Remote Code Execution
Critical
Windows 7 for x64-based Systems Service Pack 1
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2845187)
Critical 
Remote Code Execution
Critical
Windows 8
Windows 8 for 32-bit Systems
(2845187)
Critical 
Remote Code Execution
Critical
Windows 8 for 64-bit Systems
(2845187)
Critical 
Remote Code Execution
Critical
Windows Server 2012
Windows Server 2012
(2845187)
Critical 
Remote Code Execution
Critical

A remote code execution vulnerability exists in the way that Microsoft DirectShow parses GIF image files. This vulnerability could allow remote code execution if a user opened a specially crafted GIF file. If a user is logged on with administrative user rights, 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-2013-3174.

Mitigating Factors

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 specially crafted website that is designed to exploit this vulnerability through Internet Explorer. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by getting them to click a link in an email message or in an Instant Messenger message that takes users to the attacker's website, or by opening an attachment sent through email, and then convince users to debug the malicious web content.
  • The vulnerability cannot be exploited automatically through email. For an attack to be successful, a user must open an attachment that is sent in an email 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.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

FAQ

What is the scope of the vulnerability? 
This is a remote code execution vulnerability.

What causes the vulnerability? 
The vulnerability is caused when Microsoft DirectShow improperly handles specially crafted GIF image files.

What is GIF?  
GIF stands for Graphic Interchange Format. It is an older image file format that uses a 256-color palette and was primarily intended for use with 8-bit video boards. It has since largely been replaced by the PNG and TIF graphics formats.

What is DirectX? 
Microsoft DirectX is a feature of the Windows operating system. It is used for streaming media on Microsoft Windows operating systems to enable graphics and sound when playing games or watching video.

What is DirectShow? 
DirectX consists of a set of low-level Application Programming Interfaces (APIs) used by Windows programs for multimedia support. Within DirectX, the DirectShow technology performs client-side audio and video sourcing, manipulation and rendering.

Microsoft DirectShow is used for streaming media on Microsoft Windows operating systems. DirectShow is used for high-quality capture and playback of multimedia streams. It automatically detects and uses video and audio acceleration hardware when available, but also supports systems without acceleration hardware. DirectShow is also integrated with other DirectX technologies. Some examples of applications that use DirectShow include DVD players, video editing applications, AVI to ASF converters, MP3 players, and digital video capture applications

What might an attacker use the vulnerability to do? 
If a user is logged on with administrative user rights, 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.

How could an attacker exploit the vulnerability? 
This vulnerability requires that a user open a specially crafted GIF file.

In a web-based attack scenario, an attacker would have to host a web site that contains specially crafted content that is used to attempt to exploit this vulnerability. In addition, compromised websites and websites 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 website. Instead, an attacker would have to convince them to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes them to the attacker's site.

In an email attack scenario, an attacker could exploit the vulnerability by sending a specially crafted GIF file as a mail attachment and by convincing the user to open the file.

What systems are primarily at risk from the vulnerability? 
Workstations and terminal servers are primarily at risk. Servers could be at more risk if users who should not have sufficient administrative permissions are given the ability 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 how DirectShow opens GIF 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.

Update Information

Several resources are available to help administrators deploy security updates. 

  • Microsoft Baseline Security Analyzer (MBSA) lets administrators scan local and remote systems for missing security updates and common security misconfigurations. 
  • Windows Server Update Services (WSUS), Systems Management Server (SMS), and System Center Configuration Manager (SCCM) help administrators distribute security updates. 
  • The Update Compatibility Evaluator components included with Application Compatibility Toolkit aid in streamlining the testing and validation of Windows updates against installed applications. 

For information about these and other tools that are available, see Security Tools for IT Pros

Affected Software

For information about the specific security update for your affected software, click the appropriate link:

Windows XP (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file names For Windows XP Service Pack 3:
WindowsXP-KB2845187-x86-ENU.exe
For Windows XP Professional x64 Edition Service Pack 2:
WindowsServer2003.WindowsXP-KB2845187-x64-ENU.exe
Installation switches See Microsoft Knowledge Base Article 262841
Update log file KB2845187.log
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation Use Add or Remove Programs item in Control Panel or the Spuninst.exe utility located in the %Windir%\$NTUninstallKB2845187$\Spuninst folder
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification For all supported 32-bit editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP4\KB2845187\Filelist
For all supported x64-based editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP Version 2003\SP3\KB2845187\Filelist

Note The update for supported versions of Windows XP Professional x64 Edition also applies to supported versions of Windows Server 2003 x64 Edition.

Windows Server 2003 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file names For all supported 32-bit editions of Windows Server 2003:
WindowsServer2003-KB2845187-x86-ENU.exe
For all supported x64-based editions of Windows Server 2003:
WindowsServer2003.WindowsXP-KB2845187-x64-ENU.exe
For all supported Itanium-based editions of Windows Server 2003:
WindowsServer2003-KB2845187-ia64-ENU.exe
Installation switches See Microsoft Knowledge Base Article 262841
Update log file KB2845187.log
Restart requirement In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation Use Add or Remove Programs item in Control Panel or the Spuninst.exe utility located in the %Windir%\$NTUninstallKB2845187$\Spuninst folder
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows Server 2003\SP3\KB2845187\Filelist

Note The update for supported versions of Windows Server 2003 x64 Edition also applies to supported versions of Windows XP Professional x64 Edition.

Windows Vista (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file names For all supported 32-bit editions of Windows Vista:
Windows6.0-KB2845187-x86.msu
For all supported x64-based editions of Windows Vista:
Windows6.0-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file names For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB2845187-x86.msu
For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows 7 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file name For all supported 32-bit editions of Windows 7:
Windows6.1-KB2845187-x86.msu
For all supported x64-based editions of Windows 7:
Windows6.1-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart r equirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 R2 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file name For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart r equirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows 8 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file name For all supported 32-bit editions of Windows 8:
Windows8-RT-KB2845187-x86.msu
For all supported 64-bit editions of Windows 8:
Windows8-RT-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2845187
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2012 (all editions)

Reference Table

The following table contains the security update information for this software.

Security update file name For all supported editions of Windows Server 2012:
Windows8-RT-KB2845187-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement This update does not require a restart. The installer stops the required services, applies the update, and then restarts the services. However, if the required services cannot be stopped for any reason, or if required files are being used, this update will require a restart. If this behavior occurs, a message appears that advises you to restart.
Removal information To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates and select from the list of updates.
File information See Microsoft Knowledge Base Article 2845187
Registry key verification Note A registry key does not exist to validate the presence of this update.

Other Information

Acknowledgments

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

  • Andrés Gómez Ramírez for reporting the DirectShow Arbitrary Memory Overwrite Vulnerability - CVE-2013-3174

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 go to the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.

Support

How to obtain help and support for this security update

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 (July 9, 2013): Bulletin published.

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