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Microsoft Security Bulletin MS13-095 - Important

Vulnerability in Digital Signatures Could Allow Denial of Service (2868626)

Published: November 12, 2013 | Updated: February 28, 2014

Version: 1.1

General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service when an affected web service processes a specially crafted X.509 certificate.

This security update is rated Important for all supported 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 correcting how specially crafted X.509 certificates are handled in Microsoft Windows. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

Recommendation. Most customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update 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 Article 2868626
File informationYes
SHA1/SHA2 hashesYes
Known issuesNone

Affected and Non-Affected Software

The following software has been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

Affected Software 

Operating SystemMaximum Security ImpactAggregate Severity RatingUpdates Replaced
Windows XP
Windows XP Service Pack 3
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows XP Professional x64 Edition Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2003
Windows Server 2003 Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2003 x64 Edition Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2003 with SP2 for Itanium-based Systems
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Vista
Windows Vista Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Vista x64 Edition Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 for x64-based Systems Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 for Itanium-based Systems Service Pack 2
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows 7
Windows 7 for 32-bit Systems Service Pack 1
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows 7 for x64-based Systems Service Pack 1
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows 8 and Windows 8.1
Windows 8 for 32-bit Systems
(2868626)
Denial of ServiceImportantNone
Windows 8 for x64-based Systems
(2868626)
Denial of ServiceImportantNone
Windows 8.1 for 32-bit Systems
(2868626)
Denial of ServiceImportantNone
Windows 8.1 for x64-based Systems
(2868626)
Denial of ServiceImportantNone
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012
(2868626)
Denial of ServiceImportantNone
Windows Server 2012 R2
(2868626)
Denial of ServiceImportantNone
Windows RT and Windows RT 8.1
Windows RT[1]
(2868626)
Denial of ServiceImportantNone
Windows RT 8.1[1]
(2868626)
Denial of ServiceImportantNone
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(2868626)
Denial of ServiceImportant2661254 in Security Advisory 2661254
Windows Server 2012 (Server Core installation)
(2868626)
Denial of ServiceImportantNone
Windows Server 2012 R2 (Server Core installation)
(2868626)
Denial of ServiceImportantNone

[1]This update is available via Windows Update.

 

Does this update contain any security related changes to functionality? 
Yes. Security update 2868626 includes the functionality introduced in Microsoft Security Advisory 2661254. This functionality restricts the use of certificates with RSA keys less than 1024 bits in length.

I am using an older release of the software discussed in this security bulletin. What should I do? 
The affected software listed in this bulletin has been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, see the Microsoft Support Lifecycle website.

It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Service Pack Lifecycle Support Policy.

Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, see the Microsoft Worldwide Information website, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.

Vulnerability Information

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the November bulletin summary. For more information, see Microsoft Exploitability Index.

Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected SoftwareDigital Signatures Vulnerability - CVE-2013-3869 Aggregate Severity Rating
Windows XP
Windows XP Service Pack 3 Important 
Denial of Service
Important
Windows XP Professional x64 Edition Service Pack 2 Important 
Denial of Service
Important
Windows Server 2003
Windows Server 2003 Service Pack 2 Important 
Denial of Service
Important
Windows Server 2003 x64 Edition Service Pack 2 Important 
Denial of Service
Important
Windows Server 2003 with SP2 for Itanium-based Systems Important 
Denial of Service
Important
Windows Vista
Windows Vista Service Pack 2 Important 
Denial of Service
Important
Windows Vista x64 Edition Service Pack 2 Important 
Denial of Service
Important
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2 Important 
Denial of Service
Important
Windows Server 2008 for x64-based Systems Service Pack 2 Important 
Denial of Service
Important
Windows Server 2008 for Itanium-based Systems Service Pack 2 Important 
Denial of Service
Important
Windows 7
Windows 7 for 32-bit Systems Service Pack 1 Important 
Denial of Service
Important
Windows 7 for x64-based Systems Service Pack 1 Important 
Denial of Service
Important
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1 Important 
Denial of Service
Important
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1 Important 
Denial of Service
Important
Windows 8.1 and Windows 8.1
Windows 8 for 32-bit Systems Important 
Denial of Service
Important
Windows 8 for x64-based Systems Important 
Denial of Service
Important
Windows 8.1 for 32-bit Systems Important 
Denial of Service
Important
Windows 8.1 for x64-based Systems Important 
Denial of Service
Important
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012 Important 
Denial of Service
Important
Windows Server 2012 R2 Important 
Denial of Service
Important
Windows RT and Windows RT 8.1
Windows RT Important 
Denial of Service
Important
Windows RT 8.1 Important 
Denial of Service
Important
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) Important 
Denial of Service
Important
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) Important 
Denial of Service
Important
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) Important 
Denial of Service
Important
Windows Server 2012 (Server Core installation) Important 
Denial of Service
Important
Windows Server 2012 R2 (Server Core installation) Important 
Denial of Service
Important

A denial of service vulnerability exists in implementations of X.509 certificate parsing that could cause an affected web service to stop responding. The vulnerability is caused when the X.509 certificate validation operation fails to handle a specially crafted X.509 certificate.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2013-3869.

Mitigating Factors

Microsoft has not identified any mitigations for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

FAQ

What is the scope of the vulnerability? 
This is a denial of service vulnerability.

What causes the vulnerability? 
The vulnerability is caused when the X.509 certificate validation operation fails to properly handle a specially crafted X.509 certificate.

What is the X.509 standard ? 
The X.509 specification defines a standard for managing public keys through a Public Key Infrastructure (PKI). Public keys are maintained in X.509 certificates, which are digital documents that bind a subject's identity claims to a public key from a public/private asymmetric key pair. Identity claims are usually understandable by humans, such as a person's full name or email address, or a machine host name or domain name. X.509 certificates are endorsed and issued by a trusted third party, which is known as a certificate authority (CA).

What might an attacker use the vulnerability to do? 
An attacker who successfully exploited this vulnerability could cause an affected web service to become non-responsive.

How could an attacker exploit the vulnerability? 
An attacker could exploit this vulnerability by sending a specially crafted X.509 certificate to a web service. The web service could become non-responsive when it performs certificate validation.

What systems are primarily at risk from the vulnerability? 
Servers are primarily at risk.

What does the update do? 
The update addresses the vulnerability by correcting how specially crafted X.509 certificates are handled in Microsoft Windows.

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

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

Update Information

Several resources are available to help administrators deploy security updates. 

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

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

Affected Software

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

Windows XP (all editions)

Reference Table

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

Security update file names For Windows XP Service Pack 3:
WindowsXP-KB2868626-x86-ENU.exe
For Windows XP Professional x64 Edition Service Pack 2:
WindowsServer2003.WindowsXP-KB2868626-x64-ENU.exe
Installation switches See Microsoft Knowledge Base Article 262841
Update log file KB2868626.log
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation Use Add or Remove Programs item in Control Panel or the Spuninst.exe utility located in the %Windir%\$NTUninstallKB2868626$\Spuninst folder
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification For all supported 32-bit editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP4\KB2868626\Filelist
For all supported x64-based editions of Windows XP:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP Version 2003\SP3\KB2868626\Filelist

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

Windows Server 2003 (all editions)

Reference Table

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

Security update file names For all supported 32-bit editions of Windows Server 2003:
WindowsServer2003-KB2868626-x86-enu.exe
For all supported x64-based editions of Windows Server 2003:
WindowsServer2003.WindowsXP-KB2868626-x64-enu.exe
For all supported Itanium-based editions of Windows Server 2003:
WindowsServer2003-KB2868626-ia64-enu.exe
Installation switches See Microsoft Knowledge Base Article 262841
Update log file KB2868626.log
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation Use Add or Remove Programs item in Control Panel or the Spuninst.exe utility located in the %Windir%\$NTUninstallKB2868626$\Spuninst folder
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows Server 2003\SP3\KB2868626\Filelist

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

Windows Vista (all editions)

Reference Table

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

Security update file names For all supported 32-bit editions of Windows Vista:
Windows6.0-KB2868626-x86.msu
For all supported x64-based editions of Windows Vista:
Windows6.0-KB2868626-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 (all editions)

Reference Table

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

Security update file names For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB2868626-x86.msu
For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB2868626-x64.msu
For all supported Itanium-based editions of Windows Server 2008:
Windows6.0-KB2868626-ia64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows 7 (all editions)

Reference Table

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

Security update file name For all supported 32-bit editions of Windows 7:
Windows6.1-KB2868626-x86.msu
For all supported x64-based editions of Windows 7:
Windows6.1-KB2868626-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626(Comment: enter package KB)
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2008 R2 (all editions)

Reference Table

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

Security update file name For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB2868626-x64.msu
For all supported Itanium-based editions of Windows Server 2008 R2:
Windows6.1-KB2868626-ia64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, and then under Windows Update, click View installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows 8 and Windows 8.1 (all editions)

Reference Table

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

Security update file name For all supported 32-bit editions of Windows 8:
Windows8-RT-KB2868626-x86.msu
For all supported x64-based editions of Windows 8:
Windows8-RT-KB2868626-x64.msu
For all supported 32-bit editions of Windows 8.1:
Windows8.1-KB2868626-x86.msu
For all supported x64-based editions of Windows 8.1:
Windows8.1-KB2868626-x64.msu
Installation switches See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows Server 2012 and Windows Server 2012 R2 (all editions)

Reference Table

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

Security update file name For all supported editions of Windows Server 2012:
Windows8-RT-KB2868626-x64.msu
For all supported editions of Windows Server 2012 R2:
Windows8.1-KB2868626-x64.msu
See Microsoft Knowledge Base Article 934307
Restart requirement Yes, you must restart your system after you apply this security update.
Removal i nformation To uninstall an update installed by WUSA, use the /Uninstall setup switch or click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates and select from the list of updates.
File i nformation See Microsoft Knowledge Base Article 2868626
Registry k ey v erification Note A registry key does not exist to validate the presence of this update.

Windows RT and Windows RT 8.1 (all editions)

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

Deployment This update is available via Windows Update only.
R estart Requirement Yes, you must restart your system after you apply this security update.
Removal Information Click Control Panel, click System and Security, click Windows Update, and then under See also, click Installed updates and select from the list of updates.
File Information See Microsoft Knowledge Base Article 2868626

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 (November 12, 2013): Bulletin published.
  • V1.1 (February 28, 2014): Bulletin revised to announce a detection change in the 2868626 update for Windows 8.1 for 32-bit Systems, Windows 8.1 for x64-based Systems, Windows RT 8.1, and Windows Server 2012 R2. This is a detection change only. There were no changes to the update files. Customers who have already successfully updated their systems do not need to take any action.

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