Security Bulletin
Microsoft Security Bulletin MS10-093 - Important
Vulnerability in Windows Movie Maker Could Allow Remote Code Execution (2424434)
Published: December 14, 2010
Version: 1.0
General Information
Executive Summary
This security update resolves a publicly disclosed vulnerability in Windows Movie Maker. The vulnerability could allow remote code execution if an attacker convinces a user to open a legitimate Windows Movie Maker file that is located in the same network directory as a specially crafted library file. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a document from this location that is then loaded by a vulnerable application.
This security update is rated Important for Windows Movie Maker 2.6 on all supported editions of Windows Vista. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerability by correcting the way Windows Movie Maker loads external libraries. 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
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 | Component | Maximum Security Impact | Aggregate Severity Rating | Bulletins Replaced by this Update |
|---|---|---|---|---|
| Windows Vista Service Pack 1 and Windows Vista Service Pack 2 | Movie Maker 2.6[1] | Remote Code Execution | Important | MS10-050 |
| Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2 | Movie Maker 2.6[1] | Remote Code Execution | Important | MS10-050 |
[1]Windows Movie Maker 2.6 is an optional download that can be installed on the indicated operating systems.
Non-Affected Software
| Operating System |
|---|
| Windows XP Service Pack 3 |
| Windows XP Professional x64 Edition Service Pack 2 |
| Windows Server 2003 Service Pack 2 |
| Windows Server 2003 x64 Edition Service Pack 2 |
| Windows Server 2003 with SP2 for Itanium-based Systems |
| 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 |
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.
Is this update related to Microsoft Security Advisory 2269637?
Yes, the vulnerability addressed by this update is related to the class of vulnerabilities, described in Microsoft Security Advisory 2269637, that affects how applications load external libraries. This security update addresses a particular instance of this type of vulnerability.
How is Windows Movie Maker on Windows 7 affected?
Windows Movie Maker is not supported on Windows 7. However, it may be possible that vulnerable Windows Movie Maker 2.6 software exists on a Windows 7 system due to an upgrade scenario from Windows Vista to Windows 7 or due to other possible scenarios. Nevertheless, running Windows Movie Maker on a Windows 7 system is not supported and this security update will not be offered to Windows 7 systems.
Users running the unsupported configuration of Windows Movie Maker on Windows 7 are strongly recommended to uninstall Windows Movie Maker. Users who are unable to uninstall Windows Movie Maker can apply the workaround described in this security bulletin to help reduce the risk from this vulnerability.
For Windows 7 users, Microsoft recommends Windows Live Movie Maker. Windows Live Movie Maker is available as a download from the Microsoft Download Center and is not affected by the vulnerability described in this bulletin.
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.
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 December bulletin summary. For more information, see Microsoft Exploitability Index.
| Affected Software | Insecure Library Loading Vulnerability - CVE-2010-3967 | Aggregate Severity Rating |
|---|---|---|
| Windows Movie Maker 2.6 when installed on Windows Vista Service Pack 1 and Windows Vista Service Pack 2 | Important \ Remote Code Execution | Important |
| Windows Movie Maker 2.6 when installed on Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2 | Important \ Remote Code Execution | Important |
Insecure Library Loading Vulnerability - CVE-2010-3967
A remote code execution vulnerability exists in the way that Windows Movie Maker handles the loading of DLL files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. 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-2010-3967.
Mitigating Factors for Insecure Library Loading Vulnerability - CVE-2010-3967
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:
- For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a document from this location that is then loaded by a vulnerable application.
- The file sharing protocol, Server Message Block (SMB), is often disabled on the perimeter firewall. This limits the possible attack vectors for this vulnerability.
Workarounds for Insecure Library Loading Vulnerability - CVE-2010-3967
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 loading of libraries from WebDAV and remote network shares
Note See Microsoft Knowledge Base Article 2264107 to deploy a workaround tool that allows customers to disable the loading of libraries from remote network or WebDAV shares. This tool can be configured to disallow insecure loading on a per-application or a global system basis.
Customers who are informed by their vendor of an application being vulnerable can use this tool to help protect against attempts to exploit this issue.
Note See Microsoft Knowledge Base Article 2264107 to use the automated Microsoft Fix it solution to deploy the registry key to block loading of libraries for SMB and WebDAV shares. Note that this Fix it solution does require you to install the workaround tool also described in Microsoft Knowledge Base Article 2264107 first. This Fix it solution only deploys the registry key and requires the workaround tool in order to be effective. We recommend that administrators review the KB article closely prior to deploying this Fix it solution.
Disable the WebClient service
Disabling the WebClient service helps protect affected systems from attempts to exploit this vulnerability by blocking the most likely remote attack vector through the Web Distributed Authoring and Versioning (WebDAV) client service. After applying this workaround it is still possible for remote attackers who successfully exploit this vulnerability to cause the system to run programs located on the targeted user's computer or the Local Area Network (LAN), but users will be prompted for confirmation before opening arbitrary programs from the Internet.
To disable the WebClient Service, perform the following steps:
- Click Start, click Run, type Services.msc and then click OK.
- Right-click WebClient service and select Properties.
- Change the Startup type to Disabled. If the service is running, click Stop.
- Click OK and exit the management application.
Impact of workaround. When the WebClient service is disabled, Web Distributed Authoring and Versioning (WebDAV) requests are not transmitted. In addition, any services that explicitly depend on the Web Client service will not start, and an error message will be logged in the System log. For example, WebDAV shares will be inaccessible from the client computer.
How to undo the workaround.
To re-enable the WebClient Service, follow these steps:
- Click Start, click Run, type Services.msc and then click OK.
- Right-click WebClient service and select Properties.
- Change the Startup type to Automatic. If the service is not running, click Start.
- Click OK and exit the management application.
Block TCP ports 139 and 445 at the firewall
These ports are used to initiate a connection with the affected component. Blocking TCP ports 139 and 445 at the firewall will help protect systems that are behind that firewall from attempts to exploit this vulnerability. Microsoft recommends that you block all unsolicited inbound communication from the Internet to help prevent attacks that may use other ports. For more information about ports, see the TechNet article, TCP and UDP Port Assignments.
Impact of workaround. Several Windows services use the affected ports. Blocking connectivity to the ports may cause various applications or services to not function. Some of the applications or services that could be impacted are listed below:
- Applications that use SMB (CIFS)
- Applications that use mailslots or named pipes (RPC over SMB)
- Server (File and Print Sharing)
- Group Policy
- Net Logon
- Distributed File System (DFS)
- Terminal Server Licensing
- Print Spooler
- Computer Browser
- Remote Procedure Call Locator
- Fax Service
- Indexing Service
- Performance Logs and Alerts
- Systems Management Server
- License Logging Service
How to undo the workaround. Unblock TCP ports 139 and 445 at the firewall. For more information about ports, see TCP and UDP Port Assignments.
FAQ for Insecure Library Loading Vulnerability - CVE-2010-3967
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 vulnerability is caused by Windows Movie Maker incorrectly restricting the path used for loading external libraries.
What is Windows Movie Maker?
Windows Movie Maker is an application that allows users to create, edit, and add special effects to home movies. Windows Movie Maker is included with releases of Windows XP and Windows Vista. This vulnerability only affects Movie Maker 2.6, which is an optional download that can be installed on the affected operating systems.
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. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. If a user is logged-on with administrative user rights, an attacker could take complete control of the affected system. 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?
An attacker could convince a user to open a legitimate Windows Movie Maker (.mswmm) file that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the .mswmm file, Windows Movie Maker could attempt to load the DLL file and execute any code it contained.
In an e-mail attack scenario, an attacker could exploit the vulnerability by sending a legitimate .mswmm attachment to a user, and convincing the user to place the attachment into a directory containing a specially crafted DLL file and to open the .mswmm file. Then, while opening the .mswmm file, Windows Movie Maker could attempt to load the DLL file and execute any code it contained.
In a network scenario, an attacker could place a legitimate .mswmm file and a specially crafted DLL in a UNC or WebDAV location and then convince the user to open the .mswmm file.
What systems are primarily at risk from the vulnerability?
This vulnerability mainly affects workstations where users may be expected to open attachments from untrusted network locations.
What does the update do?
The update addresses this vulnerability by correcting the manner in which Windows Movie Maker loads external libraries.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
Yes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2010-3967.
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
Detection and Deployment Tools and Guidance
Security Central
Manage the software and security updates you need to deploy to the servers, desktop, and mobile systems in your organization. For more information see the TechNet Update Management Center. The Microsoft TechNet Security Web site provides additional information about security in Microsoft products.
Security updates are available from Microsoft Update and Windows Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update."
Finally, security updates can be downloaded from the Microsoft Update Catalog. The Microsoft Update Catalog provides a searchable catalog of content made available through Windows Update and Microsoft Update, including security updates, drivers and service packs. By searching using the security bulletin number (such as, "MS07-036"), you can add all of the applicable updates to your basket (including different languages for an update), and download to the folder of your choosing. For more information about the Microsoft Update Catalog, see the Microsoft Update Catalog FAQ.
Detection and Deployment Guidance
Microsoft provides detection and deployment guidance for security updates. This guidance contains recommendations and information that can help IT professionals understand how to use various tools for detection and deployment of security updates. For more information, see Microsoft Knowledge Base Article 961747.
Microsoft Baseline Security Analyzer
Microsoft Baseline Security Analyzer (MBSA) allows administrators to scan local and remote systems for missing security updates as well as common security misconfigurations. For more information about MBSA, visit Microsoft Baseline Security Analyzer.
The following table provides the MBSA detection summary for this security update.
| Software | MBSA |
|---|---|
| Windows Vista Service Pack 1 and Windows Vista Service Pack 2 | Yes |
| Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2 | Yes |
Note For customers using legacy software not supported by the latest release of MBSA, Microsoft Update, and Windows Server Update Services, please visit Microsoft Baseline Security Analyzer and reference the Legacy Product Support section on how to create comprehensive security update detection with legacy tools.
Windows Server Update Services
Windows Server Update Services (WSUS) enables information technology administrators to deploy the latest Microsoft product updates to computers that are running the Windows operating system. For more information about how to deploy security updates using Windows Server Update Services, see the TechNet article, Windows Server Update Services.
Systems Management Server
The following table provides the SMS detection and deployment summary for this security update.
| Software | SMS 2.0 | SMS 2003 with SUIT | SMS 2003 with ITMU | Configuration Manager 2007 |
|---|---|---|---|---|
| Windows Vista Service Pack 1 and Windows Vista Service Pack 2 | No | No | Yes | Yes |
| Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2 | No | No | Yes | Yes |
For SMS 2.0 and SMS 2003, the Security Update Inventory Tool (SUIT) can be used by SMS to detect security updates. See also Downloads for Systems Management Server 2.0.
For SMS 2003, the SMS 2003 Inventory Tool for Microsoft Updates (ITMU) can be used by SMS to detect security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 ITMU, see SMS 2003 Inventory Tool for Microsoft Updates. For more information about SMS scanning tools, see SMS 2003 Software Update Scanning Tools. See also Downloads for Systems Management Server 2003.
System Center Configuration Manager 2007 uses WSUS 3.0 for detection of updates. For more information about Configuration Manager 2007 Software Update Management, visit System Center Configuration Manager 2007.
For more information about SMS, visit the SMS Web site.
For more detailed information, see Microsoft Knowledge Base Article 910723: Summary list of monthly detection and deployment guidance articles.
Update Compatibility Evaluator and Application Compatibility Toolkit
Updates often write to the same files and registry settings required for your applications to run. This can trigger incompatibilities and increase the time it takes to deploy security updates. You can streamline testing and validating Windows updates against installed applications with the Update Compatibility Evaluator components included with Application Compatibility Toolkit.
The Application Compatibility Toolkit (ACT) contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Microsoft Windows Vista, a Windows Update, a Microsoft Security Update, or a new version of Windows Internet Explorer in your environment.
Security Update Deployment
Affected Software
For information about the specific security update for your affected software, click the appropriate link:
Windows Vista (all editions)
Reference Table
The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.
| Inclusion in Future Service Packs | The update for this issue will be included in a future service pack or update rollup |
|---|---|
| Deployment | |
| Installing without user intervention | For Movie Maker 2.6 when installed on all supported 32-bit editions of Windows Vista:\ WindowsMovieMaker2.6-KB2424434.exe /q:a |
| For Movie Maker 2.6 when installed on all supported x64-based editions of Windows Vista:\ WindowsMovieMaker2.6-KB2424434.exe /q:a | |
| Installing without restarting | For Movie Maker 2.6 when installed on all supported 32-bit editions of Windows Vista:\ WindowsMovieMaker2.6-KB2424434.exe /q:a |
| For Movie Maker 2.6 when installed on all supported x64-based editions of Windows Vista:\ WindowsMovieMaker2.6-KB2424434.exe /q:a | |
| Further information | See the subsection, Detection and Deployment Tools and Guidance |
| Restart Requirement | |
| Restart required? | 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. |
| HotPatching | Not applicable. |
| Removal Information | 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 Information | See Microsoft Knowledge Base Article 2424434 |
| Registry Key Verification | Note A registry key does not exist to validate the presence of this update. |
Deployment Information
Installing the Update
When you install this security update, the installer checks whether one or more of the files that are being updated on your system have previously been updated by a Microsoft hotfix.
For more information about the terminology that appears in this bulletin, such as hotfix, see Microsoft Knowledge Base Article 824684.
For Movie Maker 2.6 when installed on all supported editions of Windows Vista, this security update supports the following setup switches.
| Switch | Description |
|---|---|
| /q | Specifies quiet mode, or suppresses prompts, when files are being extracted. |
| /q:u | Specifies user-quiet mode, which presents some dialog boxes to the user. |
| /q:a | Specifies administrator-quiet mode, which does not present any dialog boxes to the user. |
| /t:path | Specifies the target folder for extracting files. |
| /c | Extracts the files without installing them. If /t:path is not specified, you are prompted for a target folder. |
| /c:path | Overrides the install command that is defined by author. Specifies the path and name of the Setup.inf or .exe file. |
| /r:n | Never restarts the system after installation. |
| /r:I | Prompts the user to restart the system if a restart is required, except when used with /q:a. |
| /r:a | Always restarts the system after installation. |
| /r:s | Restarts the system after installation without prompting the user. |
| /n:v | No version checking - Install the program over any earlier version. |
Note You can combine these switches into one command. For backward compatibility, the security update also supports the setup switches that the earlier version of the Setup program uses. For more information about the supported installation switches, see Microsoft Knowledge Base Article 262841.
Verifying That the Update Has Been Applied
Microsoft Baseline Security Analyzer
To verify that a security update has been applied to an affected system, you may be able to use the Microsoft Baseline Security Analyzer (MBSA) tool. See the section, Detection and Deployment Tools and Guidance, earlier in this bulletin for more information.
File Version Verification
Because there are several editions of Microsoft Windows, the following steps may be different on your system. If they are, see your product documentation to complete these steps.
- Click Start and then enter an update file name in the Start Search box.
- When the file appears under Programs, right-click the file name and click Properties.
- On the General tab, compare the file size with the file information tables provided in the bulletin KB article.
Note Depending on the edition of the operating system, or the programs that are installed on your system, some of the files that are listed in the file information table may not be installed. - You can also click the Details tab and compare information, such as file version and date modified, with the file information tables provided in the bulletin KB article.
Note Attributes other than the file version may change during installation. Comparing other file attributes to the information in the file information table is not a supported method of verifying that the update has been applied. Also, in certain cases, files may be renamed during installation. If the file or version information is not present, use one of the other available methods to verify update installation. - Finally, you can also click the Previous Versions tab and compare file information for the previous version of the file with the file information for the new, or updated, version of the file.
Other Information
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 (December 14, 2010): Bulletin published.
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