Objavljena je revizija vezana uz Microsoft Distributed File System (DFS). Izvorna preporuka odnosila se na propust koji je zlonamjernim korisnicima omogućavao izvršavanje proizvoljnog programskog koda i povećanje ovlasti na ranjivom sustavu.
| Paket: | Microsoft Windows 7, Microsoft Windows Server 2008, Microsoft Windows Vista |
| Operacijski sustavi: | Microsoft Windows Vista, Microsoft Windows Server 2008, Microsoft Windows 7 |
| Kritičnost: | 6.9 |
| Problem: | neodgovarajuće rukovanje datotekama |
| Iskorištavanje: | udaljeno |
| Posljedica: | preuzimanje potpune kontrole nad sustavom, proizvoljno izvršavanje programskog koda |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-1868, CVE-2011-1869 |
| Izvorni ID preporuke: | MS11-042 |
| Izvor: | Microsoft |
| Problem: | |
| Uočen propust odnosi se na lošu obradu pojedinih, posebno oblikovanih DFS referentnih odgovora. Revizija je izdana zbog promjene popisa ranjivih sustava. |
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| Posljedica: | |
| Udaljeni, zlonamjerni korisnici mogu iskoristiti taj propust za pokretanje proizvoljnog programskog koda i stjecanje većih ovlasti. |
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| Rješenje: | |
| Objavljena je nadogradnja koja uklanja propust te se svim korisnicima savjetuje njena primjena. |
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Izvorni tekst preporuke
Microsoft Security Bulletin MS11-042 - Critical
Vulnerabilities in Distributed File System Could Allow Remote Code Execution (2535512)
Published: June 14, 2011 | Updated: June 14, 2011
Version: 1.1
General Information
Executive Summary
This security update resolves two privately reported vulnerabilities in the Microsoft Distributed File System (DFS). The more severe of these vulnerabilities could allow remote code execution when an attacker sends a specially crafted DFS response to a client-initiated DFS request. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed.
This security update is rated Critical for all supported editions of Windows XP and Windows Server 2003; Important for all supported editions of Windows Vista and Windows Server 2008; and Important for Windows 7 for 32-bit Systems, Windows 7 for x64-based Systems, Windows Server 2008 R2 for x64-based Systems, and Windows Server 2008 R2 for Itanium-based Systems. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by correcting the way that the DFS client validates fields in specially crafted DFS referral responses and by correcting the way that the DFS service handles specially crafted DFS referral responses. 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. 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 immediately 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 XP Service Pack 3
Remote Code Execution
Critical
None
Windows XP Professional x64 Edition Service Pack 2
Remote Code Execution
Critical
None
Windows Server 2003 Service Pack 2
Remote Code Execution
Critical
None
Windows Server 2003 x64 Edition Service Pack 2
Remote Code Execution
Critical
None
Windows Server 2003 with SP2 for Itanium-based Systems
Remote Code Execution
Critical
None
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Denial of Service
Important
None
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Denial of Service
Important
None
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Denial of Service
Important
None
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Denial of Service
Important
None
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Denial of Service
Important
None
Windows 7 for 32-bit Systems
Denial of Service
Important
None
Windows 7 for x64-based Systems
Denial of Service
Important
None
Windows Server 2008 R2 for x64-based Systems*
Denial of Service
Important
None
Windows Server 2008 R2 for Itanium-based Systems
Denial of Service
Important
None
*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 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
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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 June bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software DFS Memory Corruption Vulnerability - CVE-2011-1868 DFS Referral Response Vulnerability - CVE-2011-1869 Aggregate Severity Rating
Windows XP Service Pack 3
Critical
Remote Code Execution
Important
Denial of Service
Critical
Windows XP Professional x64 Edition Service Pack 2
Critical
Remote Code Execution
Important
Denial of Service
Critical
Windows Server 2003 Service Pack 2
Critical
Remote Code Execution
Important
Denial of Service
Critical
Windows Server 2003 x64 Edition Service Pack 2
Critical
Remote Code Execution
Important
Denial of Service
Critical
Windows Server 2003 with SP2 for Itanium-based Systems
Critical
Remote Code Execution
Important
Denial of Service
Critical
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Not applicable
Important
Denial of Service
Important
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Not applicable
Important
Denial of Service
Important
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Not applicable
Important
Denial of Service
Important
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Not applicable
Important
Denial of Service
Important
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Not applicable
Important
Denial of Service
Important
Windows 7 for 32-bit Systems
Not applicable
Important
Denial of Service
Important
Windows 7 for x64-based Systems
Not applicable
Important
Denial of Service
Important
Windows Server 2008 R2 for x64-based Systems*
Not applicable
Important
Denial of Service
Important
Windows Server 2008 R2 for Itanium-based Systems
Not applicable
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.
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DFS Memory Corruption Vulnerability - CVE-2011-1868
An unauthenticated remote code execution vulnerability exists in the way that the Distributed File System (DFS) client parses specially crafted DFS responses. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted DFS response to a client-initiated DFS request. An attacker who successfully exploited this vulnerability could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1868.
Mitigating Factors for DFS Memory Corruption Vulnerability - CVE-2011-1868
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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