U radu jezgre operacijskog sustava Windows otkriven je sigurnosni propust koji lokalnim napadačima omogućuje pokretanje napada uskraćivanja usluga. Radi se o reviziji prethodno objavljenog sigurnosnog upozorenja pod oznakom MS11-068.
| Paket: | Microsoft Windows 7, Microsoft Windows Server 2008, Microsoft Windows Vista |
| Operacijski sustavi: | Microsoft Windows Vista, Microsoft Windows Server 2008, Microsoft Windows 7 |
| Kritičnost: | 5.3 |
| Problem: | neodgovarajuće rukovanje datotekama |
| Iskorištavanje: | lokalno |
| Posljedica: | uskraćivanje usluga (DoS) |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-1971 |
| Izvorni ID preporuke: | MS11-068 |
| Izvor: | Microsoft |
| Problem: | |
| Sigurnosni nedostatak posljedica je nepravilne obrade metapodataka datoteka. Revizija je objavljena zbog informativnih izmjena vezanih uz Windows Server 2008 i Windows Server 2008 R2. |
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| Posljedica: | |
| Lokalni napadač uočeni sigurnosni nedostatak može iskoristiti za pokretanje napada uskraćivanja usluga. |
|
| Rješenje: | |
| Sigurnosni problem rješava se automatskom nadogradnjom jezgre. |
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Izvorni tekst preporuke
Microsoft Security Bulletin MS11-068 - Moderate
Vulnerability in Windows Kernel Could Allow Denial of Service (2556532)
Published: August 09, 2011 | Updated: August 10, 2011
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 if a user visits a network share (or visits a Web site that points to a network share) containing a specially crafted file. In all cases, however, an attacker would have no way to force a user to visit such a network share or Web site. Instead, an attacker would have to convince a user to do so, typically by getting the user to click a link in an e-mail message or Instant Messenger message.
This security update is rated Moderate for all supported editions of Windows Vista, Windows Server 2008, Windows 7, and 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 correcting the way that the Windows kernel parses metadata information in files. 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 consider applying the security update 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
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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 Vista Service Pack 2
Denial of Service
Moderate
MS10-047
Windows Vista x64 Edition Service Pack 2
Denial of Service
Moderate
MS10-047
Windows Server 2008 for 32-bit Systems Service Pack 2***
Denial of Service
Moderate
MS10-047
Windows Server 2008 for x64-based Systems Service Pack 2***
Denial of Service
Moderate
MS10-047
Windows Server 2008 for Itanium-based Systems Service Pack 2
Denial of Service
Moderate
MS10-047
Windows 7 for 32-bit Systems
Denial of Service
Moderate
MS10-047
Windows 7 for 32-bit Systems Service Pack 1
Denial of Service
Moderate
None
Windows 7 for x64-based Systems
Denial of Service
Moderate
MS10-047
Windows 7 for x64-based Systems Service Pack 1
Denial of Service
Moderate
None
Windows Server 2008 R2 for x64-based Systems***
Denial of Service
Moderate
MS10-047
Windows Server 2008 R2 for x64-based Systems Service Pack 1***
Denial of Service
Moderate
None
Windows Server 2008 R2 for Itanium-based Systems
Denial of Service
Moderate
MS10-047
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Denial of Service
Moderate
None
***Server Core installation not affected. The vulnerability addressed by this update does not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when installed using the Server Core installation option, even though files affected by this vulnerability may be present on the system. However, users with the affected files will still be offered this update because the update files are newer (with higher version numbers) than the files that are currently on your system. 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 Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
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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 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 Web site.
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 Lifecycle Supported Service Packs.
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 Web site, 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.
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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 August bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Windows Kernel Metadata Parsing DOS Vulnerability - CVE-2011-1971 Aggregate Severity Rating
Windows Vista Service Pack 2
Moderate
Denial of Service
Moderate
Windows Vista x64 Edition Service Pack 2
Moderate
Denial of Service
Moderate
Windows Server 2008 for 32-bit Systems Service Pack 2***
Moderate
Denial of Service
Moderate
Windows Server 2008 for x64-based Systems Service Pack 2***
Moderate
Denial of Service
Moderate
Windows Server 2008 for Itanium-based Systems Service Pack 2
Moderate
Denial of Service
Moderate
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Moderate
Denial of Service
Moderate
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Moderate
Denial of Service
Moderate
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1***
Moderate
Denial of Service
Moderate
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Moderate
Denial of Service
Moderate
***Server Core installation not affected. The vulnerability addressed by this update does not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when installed using the Server Core installation option, even though files affected by this vulnerability may be present on the system. However, users with the affected files will still be offered this update because the update files are newer (with higher version numbers) than the files that are currently on your system. 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.
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Windows Kernel Metadata Parsing DOS Vulnerability - CVE-2011-1971
A denial of service vulnerability exists in Windows due to the way the kernel parses file meta-data when browsing to a folder. An attacker who successfully exploited this vulnerability could cause the affected system to crash.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1971.
Mitigating Factors for Windows Kernel Metadata Parsing DOS Vulnerability - CVE-2011-1971
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:
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