Microsoft Security Bulletin MS10-104 - Important

Vulnerability in Microsoft SharePoint Could Allow Remote Code Execution (2455005)

Published: Tuesday, December 14, 2010

Version: 1.0

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft SharePoint. The vulnerability could allow remote code execution in the security context of a guest user if an attacker sent a specially crafted SOAP request to the Document Conversions Launcher Service in a SharePoint server environment that is using the Document Conversions Load Balancer Service. By default, the Document Conversions Load Balancer Service and Document Conversions Launcher Service are not enabled in Microsoft Office SharePoint Server 2007.

This security update is rated Important for all supported editions of Microsoft Office SharePoint Server 2007. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The update addresses the vulnerability by modifying the way that the Document Conversion Launcher Service validates specially crafted SOAP requests. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Microsoft recommends that customers apply the update at the earliest opportunity.

Known Issues. 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

Microsoft SharePoint Server	Maximum Security Impact	Aggregate Severity Rating	Bulletins Replaced by this Update
Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions) (KB2433089)	Remote Code Execution	Important	None
Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions) (KB2433089)	Remote Code Execution	Important	None

Non-Affected Software

Office and Other Software
Microsoft Windows SharePoint Services 2.0
Microsoft SharePoint Portal Server 2001 Service Pack 3
Microsoft SharePoint Portal Server 2003 Service Pack 3
Microsoft Windows SharePoint Services 3.0 Service Pack 2 (32-bit versions)
Microsoft Windows SharePoint Services 3.0 Service Pack 2 (64-bit versions)
SharePoint Foundation 2010
Microsoft SharePoint Server 2010
Microsoft Groove Server 2010
Microsoft Groove 2007
Microsoft SharePoint Workspace

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Information

Severity Ratings and Vulnerability Identifiers

Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software	Malformed Request Code Execution Vulnerability - CVE-2010-3964	Aggregate Severity Rating
Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions)	Important Remote Code Execution	Important
Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions)	Important Remote Code Execution	Important

Malformed Request Code Execution Vulnerability - CVE-2010-3964

A remote code execution vulnerability exists in the way that the Document Conversions Launcher Service validates SOAP requests before processing on a SharePoint server. An attacker who successfully exploited this vulnerability could run arbitrary code on an affected SharePoint server under the security context of a guest account.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-3964.

Mitigating Factors for Malformed Request Code Execution Vulnerability - CVE-2010-3964

Workarounds for Malformed Request Code Execution Vulnerability - CVE-2010-3964

FAQ for Malformed Request Code Execution Vulnerability - CVE-2010-3964

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could run arbitrary code in the security context of a guest account on the affected SharePoint server.

What causes the vulnerability?
This vulnerability is caused when the Document Conversions Launcher Service does not properly validate specially crafted Simple Object Access Protocol (SOAP) requests.

What is Document Conversions Launcher Service?
Document Conversions Launcher Service schedules and initiates the document conversions on a server. When Microsoft Office SharePoint Server 2007 passes a document conversion request to the service, the Document Conversions Launcher Service calls the appropriate document converter. In most server farm configurations, the Document Conversions Launcher Service and the converter programs that it starts should be installed on an application server. Each application server can only have a single Document Conversions Launcher Service enabled.

Document Conversions Launcher Service runs under the HVU_ComputerName account. The HVU_ComputerName account is a local guest account created on the application server when the Document Conversions Launcher Service is enabled.

What is Document Conversions Load Balancer Service?
Document Conversions Load Balancer Service balances document conversion requests. The Document Conversions Load Balancer Service can be configured on a stand-alone server or on one server in a farm. When it receives a converter request from Microsoft Office SharePoint Server 2007, the Document Conversions Load Balancer Service returns a Uniform Resource Identifier (URI) pointing to the appropriate Document Conversions Launcher Service. SharePoint Server 2007 connects to the specified launcher via SOAP requests and requests that it convert the specified document.

Note that disabling the Document Conversions Load Balancer Service stops the document conversion process and also disables the Document Conversions Launcher Service.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code in the security context of a guest user on the target server.

How could an attacker exploit the vulnerability?
An attacker can send a specially crafted SOAP request to the Document Conversions Launcher Service in a SharePoint server environment that is using the Document Conversions Load Balancer Service. When the Document Conversions Launcher Service processes the specially crafted SOAP request, the vulnerability could allow remote code execution in the security context of a guest account on the affected system.

What systems are primarily at risk from the vulnerability?
SharePoint server environments that use the Document Conversions Load Balancer Service are primarily at risk from this vulnerability. The vulnerability could allow remote code execution on servers running the Document Conversions Launcher Service in the SharePoint server environment.

What does the update do?
This update addresses the vulnerability by modifying the way that the Document Conversion Launcher Service validates specially crafted SOAP requests.

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

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
Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions)	Yes
Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions)	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
Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions)	No	No	Yes. See Note for Microsoft Office SharePoint Server 2007 below	Yes. See Note for Microsoft Office SharePoint Server 2007 below
Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions)	No	No	Yes. See Note for Microsoft Office SharePoint Server 2007 below	Yes. See Note for Microsoft Office SharePoint Server 2007 below

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.

Note for Microsoft Office SharePoint Server 2007 The detection table described above is based on single-server Microsoft Office SharePoint Server 2007 deployments. The detection tools do not detect the applicability of the update on systems configured as part of a multiple-system SharePoint server farms. For more information about deploying updates on both stand-alone and multi server configurations, see the TechNet article, Deploy software updates for Office SharePoint Server 2007.

Note If you have used an Administrative Installation Point (AIP) for deploying Office XP or Office 2003, you may not be able to deploy the update using SMS if you have updated the AIP from the original baseline. For more information, see the Office Administrative Installation Point heading in this section.

Office Administrative Installation Point

If you installed your application from a server location, the server administrator must update the server location with the administrative update and deploy that update to your system.

For supported versions of Microsoft Office XP, see Creating an Administrative Installation Point. For more information on how to change the source for a client system from an updated administrative installation point to an Office XP original baseline source, see Microsoft Knowledge Base Article 922665.

Note If you plan to manage software updates centrally from an updated administrative image, you can find more information in the article Updating Office XP Clients from a Patched Administrative Image.
For supported versions of Microsoft Office 2003, see Creating an Administrative Installation Point. For more information on how to change the source for a client computer from an updated administrative installation point to an Office 2003 original baseline source or Service Pack 3 (SP3), see Microsoft Knowledge Base Article 902349.

Note If you plan to manage software updates centrally from an updated administrative image, you can find more information in the article, Distributing Office 2003 Product Updates.
For creating a network installation point for supported versions of Microsoft Office, see Create a network installation point for Microsoft Office.

Note If you plan to manage security updates centrally, use Windows Server Update Services. For more information about how to deploy security updates for Microsoft Office, visit the Windows Server Update Services Web site.

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


Inclusion in Future Service Packs	There are no more service packs planned for this software. The update for this issue may be included in a future update rollup.
Deployment
Installing without user intervention	For Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions): Office2007-kb2433089-fullfile-x86-glb.exe /passive
	For Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions): Office2007-kb2433089-fullfile-x64-glb.exe /passive
Installing without restarting	For Microsoft Office SharePoint Server 2007 Service Pack 2 (32-bit editions): Office2007-kb2433089-fullfile-x86-glb.exe /norestart
	For Microsoft Office SharePoint Server 2007 Service Pack 2 (64-bit editions): Office2007-kb2433089-fullfile-x64-glb.exe /norestart
Update log file	Not applicable
Further information	For detection and deployment, see the earlier section, Detection and Deployment Tools and Guidance.
Restart Requirement
Restart required?	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. To help reduce the chance that a restart will be required, stop all affected services and close all applications that may use the affected files prior to installing the security update. For more information about the reasons why you may be prompted to restart, see Microsoft Knowledge Base Article 887012.
HotPatching	Not applicable
Removal Information	This security update cannot be removed.
File Information	See Microsoft Knowledge Base Article 2433089
Registry Key Verification	Not applicable

Supported Security Update Installation Switches
Switch	Description
/? or /help	Displays usage dialog.
/passive	Specifies passive mode. Requires no user interaction; users see basic progress dialogs but cannot cancel.
/quiet	Specifies quiet mode, or suppresses prompts, when files are being extracted.
/norestart	Suppresses restarting the system if the update requires a restart.
/forcerestart	Automatically restarts the system after applying the update, regardless of whether the update requires the restart.
/extract	Extracts the files without installing them. You are prompted for a target folder.
/extract:<path>	Overrides the install command that is defined by author. Specifies the path and name of the Setup.inf or .exe file.
/lang:<LCID>	Forces the use of a specific language, when the update package supports that language.
/log:<log file>	Enables logging, by both Vnox and Installer, during the update installation.

Other Information

Acknowledgments

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

Oleksandr Mirosh, working with TippingPoint's Zero Day Initiative, for reporting the Malformed Request Code Execution Vulnerability (CVE-2010-3964)

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.