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Microsoft Security Bulletin MS13-040 - Important

Vulnerabilities in .NET Framework Could Allow Spoofing

Published: May 14, 2013 | Updated: May 29, 2013

Version: 1.1

General Information

Executive Summary

This security update resolves one privately reported vulnerability and one publicly disclosed vulnerability in the .NET Framework. The more severe of the vulnerabilities could allow spoofing if a .NET application receives a specially crafted XML file. An attacker who successfully exploited the vulnerabilities could modify the contents of an XML file without invalidating the file's signature and could gain access to endpoint functions as if they were an authenticated user.

This security update is rated Important for Microsoft .NET Framework 2.0 Service Pack 2, Microsoft .NET Framework 3.5, Microsoft .NET Framework 3.5.1, Microsoft .NET Framework 4, and Microsoft .NET Framework 4.5 on affected editions of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by modifying how the .NET Framework validates the signatures in XML files and correcting the way it creates policy requirements for authentication. 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. 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 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.

Knowledge Base Article

Knowledge Base Article2836440
File informationYes
SHA1/SHA2 hashesYes
Known issuesYes

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, see Microsoft Support Lifecycle.

Affected Software

Operating SystemComponentMaximum Security ImpactAggregate Severity RatingUpdates Replaced
Windows XP
Windows XP Service Pack 3Microsoft .NET Framework 2.0 Service Pack 2
(2804577)
SpoofingImportant979909 in MS10-041
Windows XP Service Pack 3Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows XP Professional x64 Edition Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804577)
SpoofingImportant979909 in MS10-041
Windows XP Professional x64 Edition Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2003
Windows Server 2003 Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804577)
SpoofingImportant979909 in MS10-041
Windows Server 2003 Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2003 x64 Edition Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804577)
SpoofingImportant979909 in MS10-041
Windows Server 2003 x64 Edition Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2003 with SP2 for Itanium-based SystemsMicrosoft .NET Framework 2.0 Service Pack 2
(2804577)
SpoofingImportant979909 in MS10-041
Windows Server 2003 with SP2 for Itanium-based SystemsMicrosoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Vista
Windows Vista Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804580)
SpoofingImportant979910 in MS10-041
Windows Vista Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Vista Service Pack 2Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Vista x64 Edition Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804580)
SpoofingImportant979910 in MS10-041
Windows Vista x64 Edition Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Vista x64 Edition Service Pack 2Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804580)
SpoofingImportant979910 in MS10-041
Windows Server 2008 for 32-bit Systems Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2008 for 32-bit Systems Service Pack 2Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2008 for x64-based Systems Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804580)
SpoofingImportant979910 in MS10-041
Windows Server 2008 for x64-based Systems Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2008 for x64-based Systems Service Pack 2Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2008 for Itanium-based Systems Service Pack 2Microsoft .NET Framework 2.0 Service Pack 2
(2804580)
SpoofingImportant979910 in MS10-041
Windows Server 2008 for Itanium-based Systems Service Pack 2Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows 7
Windows 7 for 32-bit Systems Service Pack 1Microsoft .NET Framework 3.5.1
(2804579)
SpoofingImportantNone
Windows 7 for 32-bit Systems Service Pack 1Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows 7 for 32-bit Systems Service Pack 1Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows 7 for x64-based Systems Service Pack 1Microsoft .NET Framework 3.5.1
(2804579)
SpoofingImportantNone
Windows 7 for x64-based Systems Service Pack 1Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows 7 for x64-based Systems Service Pack 1Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1Microsoft .NET Framework 3.5.1
(2804579)
SpoofingImportantNone
Windows Server 2008 R2 for x64-based Systems Service Pack 1Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2008 R2 for x64-based Systems Service Pack 1Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1Microsoft .NET Framework 3.5.1
(2804579)
SpoofingImportantNone
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows 8
Windows 8 for 32-bit SystemsMicrosoft .NET Framework 3.5
(2804584)
SpoofingImportantNone
Windows 8 for 32-bit SystemsMicrosoft .NET Framework 4.5
(2804583)
SpoofingImportantNone
Windows 8 for 64-bit SystemsMicrosoft .NET Framework 3.5
(2804584)
SpoofingImportantNone
Windows 8 for 64-bit SystemsMicrosoft .NET Framework 4.5
(2804583)
SpoofingImportantNone
Windows Server 2012
Windows Server 2012Microsoft .NET Framework 3.5
(2804584)
SpoofingImportantNone
Windows Server 2012Microsoft .NET Framework 4.5
(2804583)
SpoofingImportantNone
Windows RT
Windows RTMicrosoft .NET Framework 4.5[2]
(2804583)
SpoofingImportantNone
Server Core installation option
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)Microsoft .NET Framework 3.5.1
(2804579)
SpoofingImportantNone
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)Microsoft .NET Framework 4[1]
(2804576)
SpoofingImportantNone
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)Microsoft .NET Framework 4.5
(2804582)
SpoofingImportantNone
Windows Server 2012 (Server Core installation)Microsoft .NET Framework 3.5
(2804584)
SpoofingImportantNone
Windows Server 2012 (Server Core installation)Microsoft .NET Framework 4.5
(2804583)
SpoofingImportantNone

[1].NET Framework 4 and .NET Framework 4 Client Profile affected. The .NET Framework version 4 redistributable packages are available in two profiles: .NET Framework 4 and .NET Framework 4 Client Profile. .NET Framework 4 Client Profile is a subset of .NET Framework 4. The vulnerability addressed in this update affects both .NET Framework 4 and .NET Framework 4 Client Profile. For more information, see the MSDN article, Installing the .NET Framework.

[2]Windows RT security updates are provided via Windows Update.

 

Non-Affected Software

Software
Microsoft .NET Framework 1.0 Service Pack 3
Microsoft .NET Framework 1.1 Service Pack 1
Microsoft .NET Framework 3.0 Service Pack 2
Microsoft .NET Framework 3.5 Service Pack 1

 

Non-Applicable Software

Software
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)

How do I determine which version of the Microsoft .NET Framework is installed?
You can install and run multiple versions of the .NET Framework on a system, and you can install the versions in any order. There are several ways to determine which versions of the .NET Framework are currently installed. For more information, see Microsoft Knowledge Base Article 318785.

What is the difference between .NET Framework 4 and .NET Framework 4 Client Profile?
The .NET Framework version 4 redistributable packages are available in two profiles: .NET Framework 4 and .NET Framework 4 Client Profile. The .NET Framework 4 Client Profile is a subset of the .NET Framework 4 profile that is optimized for client applications. It provides functionality for most client applications, including Windows Presentation Foundation (WPF), Windows Forms, Windows Communication Foundation (WCF), and ClickOnce features. This enables faster deployment and a smaller install package for applications that target the .NET Framework 4 Client Profile. For more information, see the MSDN article, .NET Framework Client Profile.

I have .NET Framework 3.0 Service Pack 2 installed; this version is not listed among the affected software in this bulletin. Do I need to install an update? 
This bulletin describes a vulnerability that affects the .NET Framework 2.0 feature layer. The .NET Framework 3.0 Service Pack 2 installer chains in the .NET Framework 2.0 Service Pack 2 setup, so installing the former also installs the latter. Therefore, customers who have.NET Framework 3.0 Service Pack 2 installed need to install security updates for .NET Framework 2.0 Service Pack 2.

I have .NET Framework 3.5 Service Pack 1 installed. Do I need to install any updates? 
This bulletin describes a vulnerability that affects the .NET Framework 2.0 feature layer. The .NET Framework 3.5 Service Pack 1 installer chains in both the .NET Framework 2.0 Service Pack 2 setup and the .NET Framework 3.0 Service Pack 2 setup. Therefore, customers who have .NET Framework 3.5 Service Pack 1 installed need to install security updates for.NET Framework 2.0 Service Pack 2.

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

Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected SoftwareXML Digital Signature Spoofing Vulnerability - CVE-2013-1336Authentication Bypass Vulnerability - CVE-2013-1337Aggregate Severity Rating
Microsoft .NET Framework 2.0 Service Pack 2
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Microsoft Windows XP Service Pack 3
(2804577)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Microsoft Windows XP Professional x64 Edition Service Pack 2
(2804577)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Microsoft Windows Server 2003 Service Pack 2
(2804577)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Microsoft Windows Server 2003 x64 Edition Service Pack 2
(2804577)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 when installed on Microsoft Windows Server 2003 for Itanium-based Systems Service Pack 2
(2804577)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Vista Service Pack 2
(2804580)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Vista x64 Edition Service Pack 2
(2804580)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2
(2804580)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2
(2804580)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for Itanium-Based Systems Service Pack 2
(2804580)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5
Microsoft .NET Framework 3.5 on Windows 8 for 32-bit Systems
(2804584)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5 on Windows 8 for 64-bit Systems
(2804584)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5 on Windows Server 2012
(2804584)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5.1
Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1
(2804579)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1
(2804579)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2804579)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
(2804579)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4
Microsoft .NET Framework 4 when installed on Microsoft Windows XP Service Pack 3
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Microsoft Windows XP Professional x64 Edition Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Microsoft Windows Server 2003 Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Microsoft Windows Server 2003 x64 Edition Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Microsoft Windows Server 2003 for Itanium-based Systems Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Vista Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Vista x64 Edition Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 for x64-based Systems Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 for Itanium-Based Systems Service Pack 2
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows 7 for 32-bit Systems Service Pack 1
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows 7 for x64-based Systems Service Pack 1
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4.5
Microsoft .NET Framework 4.5 when installed on Windows Vista Service Pack 2
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows Vista x64 Edition Service Pack 2
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows Server 2008 for x64-based Systems Service Pack 2
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows 7 for 32-bit Systems Service Pack 1
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows 7 for x64-based Systems Service Pack 1
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 on Windows 8 for 32-bit Systems
(2804583)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 on Windows 8 for 64-bit Systems
(2804583)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 on Windows Server 2012
(2804583)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 on Windows RT
(2804583)
Important
Spoofing
Important
Security Feature Bypass
Important
Server Core installation option
Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation)
(2804584)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core Installation)
(2804579)
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(2804576)[1]
Important
Spoofing
Not applicableImportant
Microsoft .NET Framework 4.5 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(2804582)
Important
Spoofing
Important
Security Feature Bypass
Important
Microsoft .NET Framework 4.5 on Windows Server 2012 (Server Core installation)
(2804583)
Important
Spoofing
Important
Security Feature Bypass
Important

 

A spoofing vulnerability exists when the Microsoft .NET Framework fails to properly validate the signature of a specially crafted XML file. An attacker who successfully exploited this vulnerability could modify the contents of an XML file without invalidating the signature associated with the file.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2013-1336.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

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:

  • Use a secure channel to transmit sensitive information

    If your application transmits sensitive XML data or XML data that is critical to the security of your application, use a secure channel to transmit this information. For instance, if you use Internet Information Server, require SSL for sensitive or security critical applications.

FAQ

What is the scope of the vulnerability? 
This is a data tampering vulnerability that could lead to spoofing.

What causes the vulnerability? 
The vulnerability is caused when the .NET Framework CLR fails to properly validate the signature of a specially crafted XML file.

What is the CLR? 
The Microsoft .NET Framework provides a run-time environment called the Common Language Runtime (CLR), which runs the code and provides services that make the development process easier. For more information about the CLR, see Common Language Runtime Overview.

What might an attacker use the vulnerability to do? 
An attacker who successfully exploited this vulnerability could modify the contents of an XML file without invalidating the signature associated with the file. If a .NET application relies on the signature to be non-malicious, the behavior of the application could become unpredictable. In custom applications, the security impact depends on the specific usage scenario.

How could an attacker exploit the vulnerability? 
In a .NET application attack scenario, an attacker could modify the contents of an XML file without invalidating the signature associated with the file.

What systems are primarily at risk from the vulnerability? 
Workstations and servers that run Windows .NET Framework applications are primarily at risk from this vulnerability.

What does the update do? 
The update addresses the vulnerability by modifying the way that the .NET Framework validates the signatures in XML 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.

A security feature bypass vulnerability exists in the way that the Microsoft .NET Framework improperly creates policy requirements for authentication when setting up custom WCF endpoint authentication. An attacker who successfully exploited this vulnerability would have access to the endpoint functions as if they were authenticated, allowing an attacker to steal information or take any actions in the context of an authenticated user.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2013-1337.

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:

Workarounds

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:

FAQ

What is the scope of the vulnerability? 
This is a security feature bypass vulnerability.

What causes the vulnerability? 
The vulnerability is caused when the .NET Framework fails to properly create the policy requirements for authentication when setting up custom WCF endpoint authentication using the userNamePasswordValidationMode parameter specific to netHttpsBinding or basicHttpsBinding classes.

What is WCF? 
Windows Communication Foundation (WCF) is Microsoft's unified programming model for building service-oriented applications that enable developers to build secure, reliable, transacted solutions that integrate across platforms and interoperate with existing investments. For more information about WCF, see Windows Communication Foundation.

What might an attacker use the vulnerability to do? 
An attacker who successfully exploited this vulnerability could gain access to endpoint functions as if they were an authenticated user. The context of the authentication bypass and the degree to which systems are impacted by the vulnerability is specific to each custom application. A program that validates the role and credentials of the user will be minimally impacted by the vulnerability by hindering an attacker's attempts to steal information or take any actions in the context of the authenticated user. However, programs that do not do these validation checks could allow an attacker to obtain information that is available only to authenticated users or could allow an attacker to take action on behalf of an authenticated user.

How could an attacker exploit the vulnerability? 
In a .NET application attack scenario, an attacker could send specially crafted queries to a WCF endpoint.

What systems are primarily at risk from the vulnerability? 
Workstations and servers that run Windows WCF services are primarily at risk from this vulnerability.

What does the update do? 
The update addresses the vulnerability by correcting how the .NET Framework creates the policy requirements for authentication.

When this security bulletin was issued, had this vulnerability been publicly disclosed? 
Yes. This vulnerability has been publicly disclosed.

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.

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file namesFor Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows XP Service Pack 3:
NDP20SP2-KB2804577-x86.exe
For Microsoft .NET Framework 4 when installed on Windows XP Service Pack 3:
NDP40-KB2804576-x86.exe
For Microsoft .NET Framework 2.0 Service Pack 2 when installed on Windows XP Professional x64 Edition Service Pack 2:
NDP20SP2-KB2804577-x64.exe
For Microsoft .NET Framework 4 when installed on Windows XP Professional x64 Edition Service Pack 2:
NDP40-KB2804576-x64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 2.0 Service Pack 2:
Microsoft .NET Framework 2.0-KB2804577_*-msi0.txt
Microsoft .NET Framework 2.0-KB2804577_*.html
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
Restart requirementIn 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.
Removal informationUse the Add or Remove Programs item in Control Panel.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 2.0 Service Pack 2:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 2.0 Service Pack 2\SP2\KB2804577
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"

For Microsoft .NET Framework 4 when installed on all supported x64-based editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"

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.

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file namesFor Microsoft .NET Framework 2.0 Service Pack 2 when installed on all supported 32-bit editions of Windows Server 2003:
NDP20SP2-KB2804577-x86.exe
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows Server 2003:
NDP40-KB2804576-x86.exe
For Microsoft .NET Framework 2.0 Service Pack 2 when installed on all supported x64-based editions of Windows Server 2003:
NDP20SP2-KB2804577-x64.exe
For Microsoft .NET Framework 4 when installed on all supported x64-based editions of Windows Server 2003:
NDP40-KB2804576-x64.exe
For Microsoft .NET Framework 2.0 Service Pack 2 when installed on all supported Itanium-based editions of Windows Server 2003:
NDP20SP2-KB2804577-IA64.exe
For Microsoft .NET Framework 4 when installed on all supported Itanium-based editions of Windows Server 2003:
NDP40-KB2804576-IA64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 2.0 Service Pack 2:
Microsoft .NET Framework 2.0-KB2804577_*-msi0.txt
Microsoft .NET Framework 2.0-KB2804577_*.html
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
Restart requirementIn 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.
Removal informationUse the Add or Remove Programs item in Control Panel.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 2.0 Service Pack 2:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 2.0 Service Pack 2\SP2\KB2804577
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows Server 2003:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported x64-based editions and Itanium-based editions of Windows Server 2003:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"

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.

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file namesFor Microsoft .NET Framework 2.0 Service Pack 2 on all supported 32-bit editions of Windows Vista:
Windows6.0-KB2804580-x86.msu
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows Vista:
NDP40-KB2804576-x86.exe
For Microsoft .NET Framework 4.5 when installed on all supported 32-bit editions of Windows Vista:
NDP45-KB2804582-x86.exe
For Microsoft .NET Framework 2.0 Service Pack 2 on all supported x64-based editions of Windows Vista:
Windows6.0-KB2804580-x64.msu
For Microsoft .NET Framework 4 when installed on all supported x64-based editions of Windows Vista:
NDP40-KB2804576-x64.exe
For Microsoft .NET Framework 4.5 when installed on all supported x64-based editions of Windows Vista:
NDP45-KB2804582-x64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 2.0 Service Pack 2:
Not applicable
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
For Microsoft .NET Framework 4.5:
KB2804582_*_*-Microsoft .NET Framework 4.5-MSP0.txt
KB2804582_*_*.html
Restart requirementThis 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 informationClick Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 2.0 Service Pack 2:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows Vista:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported x64-based and Itanium-based editions of Windows Vista:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4.5:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4.5\KB2804582
"ThisVersionInstalled" = "Y"

Windows Server 2008 (all editions)

Reference Table

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

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file namesFor Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for 32-bit Systems Service Pack 2:
Windows6.0-KB2804580-x86.msu
For Microsoft .NET Framework 4 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2:
NDP40-KB2804576-x86.exe
For Microsoft .NET Framework 4.5 when installed on Windows Server 2008 for 32-bit Systems Service Pack 2:
NDP45-KB2804582-x86.exe
For Microsoft .NET Framework 2.0 Service Pack 2 on Windows Server 2008 for x64-based Systems Service Pack 2:
Windows6.0-KB2804580-x64.msu
For Microsoft .NET Framework 4 when installed on Windows Server 2008 for x64-based Systems Service Pack 2:
NDP40-KB2804576-x64.exe
For Microsoft .NET Framework 4.5 when installed on Windows Server 2008 for x64-based Systems Service Pack 2:
NDP45-KB2804582-x64.exe
For Microsoft .NET Framework 2.0 Service Pack 2 on all supported Itanium-based editions of Windows Server 2008:
Windows6.0-KB2804580-ia64.msu
For Microsoft .NET Framework 4 when installed on Windows Server 2008 for Itanium-based Systems Service Pack 2:
NDP40-KB2804576-IA64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 2.0 Service Pack 2:
Not applicable
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
For Microsoft .NET Framework 4.5:
KB2804582_*_*-Microsoft .NET Framework 4.5-MSP0.txt
KB2804582_*_*.html
Restart requirementThis 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 informationClick Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 2.0 Service Pack 2:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows Server 2008:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported x64-based and Itanium-based editions of Windows Server 2008:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4.5:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4.5\KB2804582
"ThisVersionInstalled" = "Y"

Windows 7 (all editions)

Reference Table

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

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file nameFor Microsoft .NET Framework 3.5.1 on Windows 7 for 32-bit Systems Service Pack 1:
Windows6.1-KB2804579-x86.msu
For Microsoft .NET Framework 4 when installed on Windows 7 for 32-bit Systems Service Pack 1:
NDP40-KB2804576-x86.exe
For Microsoft .NET Framework 4.5 when installed on Windows 7 for 32-bit Systems Service Pack 1:
NDP45-KB2804582-x86.exe
For Microsoft .NET Framework 3.5.1 on Windows 7 for x64-based Systems Service Pack 1:
Windows6.1-KB2804579-x64.msu
For Microsoft .NET Framework 4 when installed on Windows 7 for x64-based Systems Service Pack 1:
NDP40-KB2804576-x64.exe
For Microsoft .NET Framework 4.5 when installed on Windows 7 for x64-based Systems Service Pack 1:
NDP45-KB2804582-x64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 3.5.1:
Not applicable
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
For Microsoft .NET Framework 4.5:
KB2804582_*_*-Microsoft .NET Framework 4.5-MSP0.txt
KB2804582_*_*.html
Restart requirementThis 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 informationClick Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 3.5.1:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.
For Microsoft .NET Framework 4 when installed on all supported 32-bit editions of Windows 7:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4 when installed on all supported x64-based editions of Windows 7:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4.5:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4.5\KB2804582
"ThisVersionInstalled" = "Y"

Windows Server 2008 R2 (all editions)

Reference Table

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

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file nameFor Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for x64-based Systems Service Pack 1:
Windows6.1-KB2804579-x64.msu
For Microsoft .NET Framework 4 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1:
NDP40-KB2804576-x64.exe
For Microsoft .NET Framework 4.5 when installed on Windows Server 2008 R2 for x64-based Systems Service Pack 1:
NDP45-KB2804582-x64.exe
For Microsoft .NET Framework 3.5.1 on Windows Server 2008 R2 for Itanium-based Systems Service Pack 1:
Windows6.1-KB2804579-ia64.msu
For Microsoft .NET Framework 4 when installed on Windows Server 2008 R2 for Itanium-based Systems Service Pack 1:
NDP40-KB2804576-IA64.exe
Installation switchesSee Microsoft Knowledge Base Article 2844699
Update log fileFor Microsoft .NET Framework 3.5.1:
Not applicable
For Microsoft .NET Framework 4:
KB2804576_*_*-Microsoft .NET Framework 4 Client Profile-MSP0.txt
KB2804576_*_*.html
For Microsoft .NET Framework 4.5:
KB2804582_*_*-Microsoft .NET Framework 4.5-MSP0.txt
KB2804582_*_*.html
Restart requirementThis 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 informationClick Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 3.5.1:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.
For Microsoft .NET Framework 4:
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2804576
"ThisVersionInstalled" = "Y"
For Microsoft .NET Framework 4.5:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Microsoft .NET Framework 4.5\KB2804582
"ThisVersionInstalled" = "Y"

Windows 8 (all editions)

Reference Table

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

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file nameFor Microsoft .NET Framework 3.5 on Windows 8 for 32-bit Systems:
Windows8-RT-KB2804584-x86.msu
For Microsoft .NET Framework 4.5 on Windows 8 for 32-bit Systems:
Windows8-RT-KB2804583-x86.msu
For Microsoft .NET Framework 3.5 on Windows 8 for 64-bit Systems:
Windows8-RT-KB2804584-x64.msu
For Microsoft .NET Framework 4.5 Windows 8 for 64-bit Systems:
Windows8-RT-KB2804583-x64.msu
Installation switchesSee Microsoft Knowledge Base Article 2844699
Restart requirementThis 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 informationClick 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 informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationFor Microsoft .NET Framework 3.5:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.
For Microsoft .NET Framework 4.5:
Note A registry key does not exist to validate the presence of this update. Use WMI to detect for the presence of this update.

Windows Server 2012 (all editions)

Reference Table

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

Inclusion in Future Service PacksThe update for this issue will be included in a future service pack or update rollup
Security update file nameFor Microsoft .NET Framework 3.5 on Windows Server 2012:
Windows8-RT-KB2804584-x64.msu
For Microsoft .NET Framework 4.5 on Windows Server 2012:
Windows8-RT-KB2804583-x64.msu
Installation switchesSee Microsoft Knowledge Base Article 2844699
Restart requirementThis 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 informationClick 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 informationSee Microsoft Knowledge Base Article 2836440
Registry key verificationNote A registry key does not exist to validate the presence of this update.

Windows RT (all editions)

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

DeploymentThis update is available via Windows Update only.
Restart RequirementYes, you must restart your system after you apply this security update.
Removal InformationClick 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 InformationSee Microsoft Knowledge Base Article 2836440

Other Information

Acknowledgments

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

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 (May 14, 2013): Bulletin published.
  • V1.1 (May 29, 2013): Added a Non-Applicable Software table to identify platforms on which the .NET Framework is not installable.

Built at 2014-04-16T02:39:51Z-07:00

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