MS12-017: Vulnerability in DNS Server Could Allow Denial of Service (2647170)

The vulnerability could allow denial of service if a remote unauthenticated attacker sends a specially crafted DNS query to the target DNS server.

Version: 1.0


General Information

Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if a remote unauthenticated attacker sends a specially crafted DNS query to the target DNS server.

This security update is rated Important for all supported editions of Windows Server 2003, 32-bit and x64-based editions of Windows Server 2008, and x64-based editions of Windows Server 2008 R2. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by modifying the way that the DNS server handles objects in memory. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

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

For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.

See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.

Known Issues. None
Top of section
Affected and Non-Affected Software

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

Affected Software








Operating System

Maximum Security Impact

Aggregate Severity Rating

Bulletins Replaced by this Update




Windows Server 2003 Service Pack 2

Denial of Service

Important

MS11-058



Windows Server 2003 x64 Edition Service Pack 2

Denial of Service

Important

MS11-058



Windows Server 2003 with SP2 for Itanium-based Systems

Denial of Service

Important

MS11-058



Windows Server 2008 for 32-bit Systems Service Pack 2*

Denial of Service

Important

MS11-058



Windows Server 2008 for x64-based Systems Service Pack 2*

Denial of Service

Important

MS11-058



Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*

Denial of Service

Important

MS11-058


*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.

Non-Affected Software





Operating System




Windows XP Service Pack 3



Windows XP Professional x64 Edition Service Pack 2



Windows Vista Service Pack 2



Windows Vista x64 Edition Service Pack 2



Windows Server 2008 for Itanium-based Systems Service Pack 2



Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1



Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1



Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Top of section
Frequently Asked Questions (FAQ) Related to This Security Update


Where are the file information details?
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.

I am running one of the platforms that are listed in the Affected Software table. Why am I not being offered the update?
The update can only be installed if DNS is enabled on the operating systems listed in the Affected Software table. By default, DNS is not enabled on these operating systems, so the update will not be offered unless DNS has been enabled.

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

Severity Ratings and Vulnerability Identifiers


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

Vulnerability Severity Rating and Maximum Security Impact by Affected Software







Affected Software

DNS Denial of Service Vulnerability - CVE-2012-0006

Aggregate Severity Rating




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 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 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*

Important
Denial of Service

Important


*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not installed using the Server Core installation option. For more information on this installation option, see the TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
Top of section
DNS Denial of Service Vulnerability - CVE-2012-0006


A denial of service vulnerability exists in the way that the DNS server improperly handles objects in memory when looking up the resource record of a domain. An attacker that successfully exploited this vulnerability could cause the DNS server on the target system to stop responding and automatically restart.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2012-0006.

Mitigating Factors for DNS Denial of Service Vulnerability - CVE-2012-0006


Microsoft has not identified any mitigating factors for this vulnerability.
Top of section
Workarounds for DNS Denial of Service Vulnerability - CVE-2012-0006


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:
Clear the DNS cache periodically
Run the following dnscmd command as described in the article, Dnscmd Syntax:

dnscmd [ServerName] /clearcache

This can be run as a scheduled task or as needed.

Impact of workaround. Clears the DNS cache memory of resource records in the specified DNS server.

How to undo the workaround.

Delete or disable any scheduled task that is running the dnscmd command.

Top of section
FAQ for DNS Denial of Service Vulnerability - CVE-2012-0006


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

What causes the vulnerability?
The vulnerability is caused when the DNS server improperly handles objects in memory while looking up a resource record.

What is a DNS resource record?
A DNS resource record (RR) identifies a particular resource within a domain. For more information, see the TechNet article, How DNS Works.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause the target system to stop responding and automatically restart.

How could an attacker exploit the vulnerability?
A remote unauthenticated attacker could exploit this vulnerability by sending a specially crafted DNS query to the target DNS server.

What systems are primarily at risk from the vulnerability?
Servers running the DNS role are primarily at risk. Servers that do not have this role enabled are not at risk.

What does the update do?
The update addresses the vulnerability by modifying the way that the DNS server handles objects in memory.

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.
Top of sectionTop of section
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 website provides additional information about security in Microsoft products.

Security updates are available from Microsoft Update and Windows Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update."

Finally, security updates can be downloaded from the Microsoft Update Catalog. The Microsoft Update Catalog provides a searchable catalog of content made available through Windows Update and Microsoft Update, including security updates, drivers and service packs. By searching using the security bulletin number (such as, "MS07-036"), you can add all of the applicable updates to your basket (including different languages for an update), and download to the folder of your choosing. For more information about the Microsoft Update Catalog, see the Microsoft Update Catalog FAQ.

Detection and Deployment Guidance

Microsoft provides detection and deployment guidance for security updates. This guidance contains recommendations and information that can help IT professionals understand how to use various tools for detection and deployment of security updates. For more information, see Microsoft Knowledge Base Article 961747.

Microsoft Baseline Security Analyzer

Microsoft Baseline Security Analyzer (MBSA) allows administrators to scan local and remote systems for missing security updates as well as common security misconfigurations. For more information about MBSA, visit Microsoft Baseline Security Analyzer.

The following table provides the MBSA detection summary for this security update.






Software

MBSA




Windows Server 2003 Service Pack 2

Yes



Windows Server 2003 x64 Edition Service Pack 2

Yes



Windows Server 2003 with SP2 for Itanium-based Systems

Yes



Windows Server 2008 for 32-bit Systems Service Pack 2

Yes



Windows Server 2008 for x64-based Systems Service Pack 2

Yes



Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1

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 2003 with ITMU

Configuration Manager 2007




Windows Server 2003 Service Pack 2

Yes

Yes



Windows Server 2003 x64 Edition Service Pack 2

Yes

Yes



Windows Server 2003 with SP2 for Itanium-based Systems

Yes

Yes



Windows Server 2008 for 32-bit Systems Service Pack 2

Yes

Yes



Windows Server 2008 for x64-based Systems Service Pack 2

Yes

Yes



Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1

Yes

Yes


Note Microsoft discontinued support for SMS 2.0 on April 12, 2011. For SMS 2003, Microsoft also discontinued support for the Security Update Inventory Tool (SUIT) on April 12, 2011. Customers are encouraged to upgrade to System Center Configuration Manager 2007. For customers remaining on SMS 2003 Service Pack 3, the Inventory Tool for Microsoft Updates (ITMU) is also an option.

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 website.

For more detailed information, see Microsoft Knowledge Base Article 910723: Summary list of monthly detection and deployment guidance articles.

Update Compatibility Evaluator and Application Compatibility Toolkit

Updates often write to the same files and registry settings required for your applications to run. This can trigger incompatibilities and increase the time it takes to deploy security updates. You can streamline testing and validating Windows updates against installed applications with the Update Compatibility Evaluator components included with Application Compatibility Toolkit.

The Application Compatibility Toolkit (ACT) contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Windows Vista, a Windows Update, a Microsoft Security Update, or a new version of Windows Internet Explorer in your environment.
Top of section
Security Update Deployment


Affected Software

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

Windows Server 2003 (all editions)


Reference Table

The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.







Inclusion in Future Service Packs

The update for this issue will be included in a future service pack or update rollup



Deployment




Installing without user intervention

For all supported 32-bit editions of Windows Server 2003:
WindowsServer2003-KB2647170-x86-enu.exe /quiet





For all supported x64-based editions of Windows Server 2003:
WindowsServer2003.WindowsXP-KB2647170-x64-enu.exe /quiet




For all supported Itanium-based editions of Windows Server 2003:
WindowsServer2003-KB2647170-ia64-enu.exe /quiet



Installing without restarting

For all supported 32-bit editions of Windows Server 2003:
WindowsServer2003-KB2647170-x86-enu.exe /norestart





For all supported x64-based editions of Windows Server 2003:
WindowsServer2003.WindowsXP-KB2647170-x64-enu.exe /norestart




For all supported Itanium-based editions of Windows Server 2003:
WindowsServer2003-KB2647170-ia64-enu.exe /norestart



Update log file

KB2647170.log



Further information

See the subsection, Detection and Deployment Tools and Guidance



Restart Requirement





Restart required?

Yes, you must restart your system after you apply this security update.



HotPatching

This security update does not support HotPatching. For more information about HotPatching, see Microsoft Knowledge Base Article 897341.



Removal Information

Use Add or Remove Programs item in Control Panel or the Spuninst.exe utility located in the %Windir%\$NTUninstallKB2647170$\Spuninst folder



File Information

See Microsoft Knowledge Base Article 2647170



Registry Key Verification

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows Server 2003\SP3\KB2647170\Filelist


Deployment Information























































































































































































































































Top of section
Windows Server 2008 (all editions)


Reference Table

The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.






Inclusion in Future Service Packs

The update for this issue will be included in a future service pack or update rollup



Deployment





Installing without user intervention

For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB2647170-x86.msu /quiet




For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB2647170-x64.msu /quiet



Installing without restarting

For all supported 32-bit editions of Windows Server 2008:
Windows6.0-KB2647170-x86.msu /quiet /norestart




For all supported x64-based editions of Windows Server 2008:
Windows6.0-KB2647170-x64.msu /quiet /norestart



Further information

See the subsection, Detection and Deployment Tools and Guidance



Restart Requirement





Restart required?

Yes, you must restart your system after you apply this security update.



HotPatching

Not applicable.



Removal Information

WUSA.exe does not support uninstall of updates. To uninstall an update installed by WUSA, click Control Panel, and then click Security. Under Windows Update, click View installed updates and select from the list of updates.



File Information

See Microsoft Knowledge Base Article 2647170



Registry Key Verification

Note A registry key does not exist to validate the presence of this update.


Deployment Information



























































Top of section
Windows Server 2008 R2 (all editions)


Reference Table

The following table contains the security update information for this software. You can find additional information in the subsection, Deployment Information, in this section.






Inclusion in Future Service Packs

The update for this issue will be included in a future service pack or update rollup



Deployment





Installing without user intervention

For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB2647170-x64.msu /quiet



Installing without restarting

For all supported x64-based editions of Windows Server 2008 R2:
Windows6.1-KB2647170-x64.msu /quiet /norestart



Further information

See the subsection, Detection and Deployment Tools and Guidance



Restart Requirement





Restart required?

Yes, you must restart your system after you apply this security update.



HotPatching

Not applicable.



Removal Information

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 Information

See Microsoft Knowledge Base Article 2647170



Registry Key Verification

Note A registry key does not exist to validate the presence of this update.


Deployment Information































































































Top of sectionTop of section
Other Information

Microsoft Active Protections Program (MAPP)

To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please visit the active protections websites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.
Top of section
Support
Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY (1-866-727-2338). For more information about available support options, see Microsoft Help and Support.
International customers can receive support from their local Microsoft subsidiaries. For more information about how to contact Microsoft for support issues, visit the International Support website.
Top of section
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.
Top of section
Revisions
V1.0 (March 13, 2012): Bulletin published.
Подписывайтесь на каналы "SecurityLab" в TelegramTelegram и Яндекс.ДзенЯндекс.Дзен, чтобы первыми узнавать о новостях и эксклюзивных материалах по информационной безопасности.