Microsoft Security Bulletin MS14-022 - Critical

• 10/11/2017
• 26 minutes to read
• • 

Vulnerabilities in Microsoft SharePoint Server Could Allow Remote Code Execution (2952166)

Published: May 13, 2014

Version: 1.0

General Information

Executive Summary

This security update resolves multiple privately reported vulnerabilities in Microsoft Office server and productivity software. The most severe of these vulnerabilities could allow remote code execution if an authenticated attacker sends specially crafted page content to a target SharePoint server.

This security update is rated Critical for supported editions of Microsoft SharePoint Server 2007, Microsoft SharePoint Server 2010, Microsoft SharePoint Server 2013, Microsoft Office Web Apps 2010, Microsoft Office Web Apps Server 2013, Microsoft SharePoint Services 3.0, and Microsoft SharePoint Foundation 2010, Microsoft SharePoint Foundation 2013, Microsoft SharePoint Designer 2007, Microsoft SharePoint Designer 2010, and Microsoft SharePoint Designer 2013. For more information, see the Affected and Non-Affected Software section.

The security update addresses the vulnerabilities by correcting how SharePoint Server and Web Applications sanitize specially crafted page content. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability later in this bulletin.

Recommendation. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically 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 from Microsoft Update 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.

Note for SharePoint Server The detection tools (such as Microsoft Update, WSUS, MBSA, SMS, and System Center Configuration Manager) are applicable for single-server Microsoft SharePoint Server deployments. The detection tools do not detect the applicability of the updates on systems configured as part of a multiple-system SharePoint server farm. For recommended instructions on how to apply updates to SharePoint Server, see Deploy software updates for SharePoint 2013.

Note for Microsoft Office Web Apps Server 2013 Applying Office Web Apps Server updates by using the automatic updates process is not supported with Office Web Apps Server. For recommended instructions on how to apply updates to Office Web Apps Server, see Apply software updates to Office Web Apps Server.

Knowledge Base Article

• Knowledge Base Article: 2952166
• File Information: Yes
• SHA1/SHA2 hashes: Yes
• Known issues: Yes

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 

Microsoft Server Software 

Microsoft Office Services and Web Apps

Productivity Software

Microsoft Office Services and Web Apps 

Productivity Software

SharePoint Page Content Vulnerabilities - CVE-2014-0251

Related remote code execution vulnerabilities exist in Microsoft SharePoint Server. An authenticated attacker who successfully exploited any of these related vulnerabilities could run arbitrary code in the security context of the W3WP service account.

To view these related vulnerabilities as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2014-0251.

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:

• To exploit any of these related vulnerabilities, an attacker must be able to authenticate on the target SharePoint site. Note that this is not a mitigating factor if the SharePoint site is configured to allow anonymous users to access the site. By default, anonymous access is not enabled.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

FAQ

What is the scope of the vulnerabilities?
These are related remote code execution vulnerabilities.

What causes the vulnerabilities?
When page content is not properly sanitized, conditions exist where an attacker could run arbitrary code in the security context of the W3WP service account.

Why is a single CVE Identifier assigned to multiple vulnerabilities?
Although the vulnerabilities are in different components of Microsoft SharePoint Server, they all share the same underlying issue and related code. The vulnerabilities are grouped into a single CVE Identifier that represents the underlying issue.

What might an attacker use the vulnerabilities to do?
An attacker who successfully exploited any of these related vulnerabilities could run arbitrary code in the security context of the W3WP service account on the target SharePoint site.

How could an attacker exploit the vulnerabilities?
An authenticated attacker could attempt to exploit any of these related vulnerabilities by sending specially crafted page content to a SharePoint server.

What systems are primarily at risk from the vulnerabilities?
Systems that are running an affected version of SharePoint server are primarily at risk.

What does the update do?
The update addresses these related vulnerabilities by correcting how SharePoint Server sanitizes specially crafted page content.

When this security bulletin was issued, had these vulnerabilities been publicly disclosed?
No. Microsoft received information about these related vulnerabilities through coordinated vulnerability disclosure.

When this security bulletin was issued, had Microsoft received any reports that these vulnerabilities were being exploited?
No. Microsoft had not received any information to indicate that these related vulnerabilities had been publicly used to attack customers when this security bulletin was originally issued.

SharePoint XSS Vulnerability - CVE-2014-1754

An elevation of privilege vulnerability exists in Microsoft SharePoint Server. An attacker who successfully exploited this vulnerability could perform cross-site scripting attacks on affected systems and run script in the security context of the logged-on user.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2014-1754.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

FAQ

What is the scope of the vulnerability?
This is an elevation of privilege vulnerability.

What causes the vulnerability?
The vulnerability is caused when SharePoint Server does not properly sanitize a specially crafted request to an affected SharePoint server.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could read content that the attacker is not authorized to read, use the victim's identity to take actions on the SharePoint site on behalf of the victim, such as change permissions and delete content, and inject malicious content in the browser of the victim.

How could an attacker exploit the vulnerability?
An authenticated attacker could exploit this vulnerability by sending a specially crafted request to an affected SharePoint server.

What systems are primarily at risk from the vulnerability?
Any system running an affected version of SharePoint Server is primarily at risk from the vulnerability.

What does the update do?
The update addresses the vulnerability by helping to ensure that SharePoint Server properly sanitizes user input.

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.

Web Applications Page Content Vulnerability - CVE-2014-1813

A remote code execution vulnerability exists in Microsoft Web Applications. An authenticated attacker who successfully exploited this vulnerability could run arbitrary code in the security context of the W3WP service account.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2014-1813.

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:

• To exploit this vulnerability, an attacker must be able to authenticate on the target SharePoint site. Note that this is not a mitigating factor if the SharePoint site is configured to allow anonymous users to access the site. By default, anonymous access is not enabled.

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?
When page content is not properly sanitized, conditions exist where an attacker could run arbitrary code in the security context of the W3WP service account.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited the vulnerability could run arbitrary code in the security context of the W3WP service account on the target SharePoint site.

How could an attacker exploit the vulnerability?
An authenticated attacker could attempt to exploit the vulnerability by sending specially crafted page content to a SharePoint server.

What systems are primarily at risk from the vulnerability?
Systems that are running an affected version of SharePoint server are primarily at risk.

What does the update do?
The update addresses the vulnerability by correcting how affected Web Applications sanitize specially crafted page content.

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.

Detection and Deployment Tools and Guidance

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 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. 

Note for SharePoint Server The detection tools (such as Microsoft Update, WSUS, MBSA, SMS, and System Center Configuration Manager) are applicable for single-server Microsoft SharePoint Server deployments. The detection tools do not detect the applicability of the updates on systems configured as part of a multiple-system SharePoint server farm. For recommended instructions on how to apply updates to SharePoint Server, see Deploy software updates for SharePoint 2013.

Note for Microsoft Office Web Apps Server 2013 Applying Office Web Apps Server updates by using the automatic updates process is not supported with Office Web Apps Server. For recommended instructions on how to apply updates to Office Web Apps Server, see Apply software updates to Office Web Apps Server.

Security Update Deployment

SharePoint Server 2007 (all editions) and Windows SharePoint Services 3.0 (all versions)

Reference Table

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