Na operacijskim sustavima Windows uočen je novi sigurnosni propust koji zlonamjernim korisnicima omogućuje XSS napade i stjecanje pristupa osjetljivim podacima.
| Paket: | Microsoft Windows 7, Microsoft Windows Server 2003, Microsoft Windows Server 2008, Microsoft Windows Vista, Microsoft Windows XP |
| Operacijski sustavi: | Microsoft Windows XP, Microsoft Windows Server 2003, Microsoft Windows Vista, Microsoft Windows Server 2008, Microsoft Windows 7 |
| Kritičnost: | 3.2 |
| Problem: | pogreška u programskoj komponenti |
| Iskorištavanje: | lokalno/udaljeno |
| Posljedica: | otkrivanje osjetljivih informacija |
| Rješenje: | programska zakrpa proizvođača |
| CVE: | CVE-2011-1894 |
| Izvorni ID preporuke: | MS11-037 |
| Izvor: | Microsoft |
| Problem: | |
| Propust je posljedica načina na koji MHTML implementacija parsira dolazne upite. |
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| Posljedica: | |
| Zlonamjerni korisnici mogu iskoristiti uočen propust za stjecanje pristupa osjetljivim podacima i izvođenje XSS (eng. Cross-site scripting) napada. |
|
| Rješenje: | |
| Svim se korisnicima savjetuje primjena nadogradnje koja uklanja navedenu ranjivost. |
|
Izvorni tekst preporuke
Microsoft Security Bulletin MS11-037 - Important
Vulnerability in MHTML Could Allow Information Disclosure (2544893)
Published: June 14, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves a publicly disclosed vulnerability in the MHTML protocol handler in Microsoft Windows. The vulnerability could allow information disclosure if a user opens a specially crafted URL from an attacker's web site. An attacker would have to convince the user to visit the web site, typically by getting them to follow a link in an e-mail message or Instant Messenger message.
This security update is rated Important for all supported editions of Windows XP, Windows Vista, and Windows 7, and is rated Low for all supported editions of Windows Server 2003, Windows Server 2008, 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 MHTML parser handles 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 XP Service Pack 3
Information Disclosure
Important
MS11-026
Windows XP Professional x64 Edition Service Pack 2
Information Disclosure
Important
MS11-026
Windows Server 2003 Service Pack 2
Information Disclosure
Low
MS11-026
Windows Server 2003 x64 Edition Service Pack 2
Information Disclosure
Low
MS11-026
Windows Server 2003 with SP2 for Itanium-based Systems
Information Disclosure
Low
MS11-026
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Information Disclosure
Important
MS11-026
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Information Disclosure
Important
MS11-026
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2**
Information Disclosure
Low
MS11-026
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2**
Information Disclosure
Low
MS11-026
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Information Disclosure
Low
MS11-026
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Information Disclosure
Important
MS11-026
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Information Disclosure
Important
MS11-026
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1**
Information Disclosure
Low
MS11-026
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Information Disclosure
Low
MS11-026
**Server Core installation not affected. The vulnerabilities addressed by this update do not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when 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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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 MHTML Mime-Formatted Request Vulnerability - CVE-2011-1894 Aggregate Severity Rating
Windows XP Service Pack 3
Important
Information Disclosure
Important
Windows XP Professional x64 Edition Service Pack 2
Important
Information Disclosure
Important
Windows Server 2003 Service Pack 2
Low
Information Disclosure
Low
Windows Server 2003 x64 Edition Service Pack 2
Low
Information Disclosure
Low
Windows Server 2003 with SP2 for Itanium-based Systems
Low
Information Disclosure
Low
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Important
Information Disclosure
Important
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2
Important
Information Disclosure
Important
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2**
Low
Information Disclosure
Low
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2**
Low
Information Disclosure
Low
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Low
Information Disclosure
Low
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Important
Information Disclosure
Important
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1
Important
Information Disclosure
Important
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1**
Low
Information Disclosure
Low
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Low
Information Disclosure
Low
**Server Core installation not affected. The vulnerabilities addressed by this update do not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when 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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MHTML Mime-Formatted Request Vulnerability - CVE-2011-1894
An information disclosure vulnerability exists in the way that MHTML interprets MIME-formatted requests for content that are embedded in an HTML document. Similar to server-side cross-site scripting (XSS) vulnerabilities, it is possible under certain conditions for this vulnerability to allow an attacker to inject a client-side script in the response to a web request run in the context of the user's instance of Internet Explorer.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2011-1894.
Mitigating Factors for MHTML Mime-Formatted Request Vulnerability - CVE-2011-1894
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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