Uočena je nova ranjivost vezana uz SMB poslužitelj na operacijskim sustavima Windows. Napadači mogu iskoristiti tu ranjivost za pokretanje napada uskraćivanja usluge
| Paket: | Microsoft Windows 7, Microsoft Windows Server 2008, Microsoft Windows Vista |
| Operacijski sustavi: | Microsoft Windows Vista, Microsoft Windows Server 2008, Microsoft Windows 7 |
| Kritičnost: | 5.8 |
| Problem: | pogreška u programskoj komponenti |
| Iskorištavanje: | udaljeno |
| Posljedica: | uskraćivanje usluga (DoS) |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-1267 |
| Izvorni ID preporuke: | MS11-048 |
| Izvor: | Microsoft |
| Problem: | |
| Ranjivost se javlja zbog načina na koji SMB poslužitelj obrađuje pojedine, posebno oblikovane SMB zahtjeve. |
|
| Posljedica: | |
| Udaljeni napadači mogu iskoristiti uočenu ranjivost za pokretanje DoS napada. |
|
| Rješenje: | |
| Svim se korisnicima savjetuje primjena osvježenih inačica. |
|
Izvorni tekst preporuke
Microsoft Security Bulletin MS11-048 - Important
Vulnerability in SMB Server Could Allow Denial of Service (2536275)
Published: June 14, 2011
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 an attacker created a specially crafted SMB packet and sent the packet to an affected system. Firewall best practices and standard default firewall configurations can help protect networks from attacks originating outside the enterprise perimeter that would attempt to exploit this vulnerability.
This security update is rated Important 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 manner in which the SMB protocol software handles specially crafted SMB requests. 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
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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 1 and Windows Vista Service Pack 2
Denial of Service
Important
MS09-050
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Denial of Service
Important
MS09-050
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Denial of Service
Important
MS09-050
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Denial of Service
Important
MS09-050
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Denial of Service
Important
MS09-050
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Denial of Service
Important
MS11-020
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Denial of Service
Important
MS11-020
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*
Denial of Service
Important
MS11-020
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Denial of Service
Important
MS11-020
*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 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 June bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software SMB Request Parsing Vulnerability- CVE-2011-1267 Aggregate Severity Rating
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Important
Denial of Service
Important
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Important
Denial of Service
Important
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Important
Denial of Service
Important
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Important
Denial of Service
Important
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Important
Denial of Service
Important
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Important
Denial of Service
Important
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
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
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-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.
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SMB Request Parsing Vulnerability- CVE-2011-1267
A denial of service vulnerability exists in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB requests. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted network message to a computer running the Server service.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1267.
Mitigating Factors for SMB Request Parsing Vulnerability- CVE-2011-1267
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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