INFORMATION BULLETIN

Q-277: Cumulative Security Update for Internet Explorer

[Microsoft Security Bulletin MS06-042 (918899)]

REVISION HISTORY:
08/23/2006 - revised to reflect the changes Microsoft has made in MS06-042 where
             they updated the caveats section with additional information 
			 regarding the release status of revised Internet Explorer & Service 
			 Pack 1 updates, as well as the release of Security Advisory 923762.
08/24/2006 - revised to add a link to Microsoft Security Advisory (923762).
08/25/2006 - revised to reflect changes Microsoft has made in MS06-042 where
             they reissued and updated additional information and vulnerability 
			 details affecting Internet Explorer 6 Service Pack 1 Customers.
11/09/2006 - revised to reflect changes Microsoft has made in MS06-042 where
             they revised the Microsoft Knowledge Base Article 926046.
03/29/2007 - revised Q-277 to reflect changes Microsoft has made in MS06-042 
             due to a new issue discovered with the security update Microsoft 
			 Knowledge Base Article 926840.
			 


[***** Start Microsoft Security Bulletin MS06-042 (918899) *****]

Microsoft Security Bulletin MS06-042

Cumulative Security Update for Internet Explorer (918899)

Version: 3.2

Summary

General Information

Executive Summary

Executive Summary:

This update resolves several newly discovered, publicly and privately reported vulnerabilities. Each vulnerability is documented in its own “Vulnerability Details” section of this bulletin.

If a user is logged on with administrative user rights, an attacker who successfully exploited the most severe of these vulnerabilities could 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. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

We recommend that customers apply the update immediately.

Severity Ratings and Vulnerability Identifiers:

Vulnerability Identifiers	Impact of Vulnerability	Internet Explorer 5.01 Service Pack 4 on Windows 2000 Service Pack 4	Internet Explorer 6 Service Pack 1 for Windows XP Service Pack 1 and Windows 2000 Service Pack 4	Internet Explorer 6 for Windows XP Service Pack 2	Internet Explorer 6 for Windows Server 2003	Internet Explorer 6 for Windows Server 2003 Service Pack 1
Redirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280	Information Disclosure	Moderate	Moderate	Moderate	Low	Low
HTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450	Remote Code Execution	None	Critical	Critical	Critical	Critical
CSS Memory Corruption Vulnerability - CVE-2006-3451	Remote Code Execution	Critical	Critical	None	Moderate	Moderate
HTML Rendering Memory Corruption Vulnerability - CVE-2006-3637	Remote Code Execution	Critical	Critical	Critical	Moderate	Moderate
COM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638	Remote Code Execution	Critical	Critical	Critical	Moderate	Moderate
Source Element Cross-Domain Vulnerability - CVE-2006-3639	Remote Code Execution and Information Disclosure	Critical	Critical	Important	Moderate	Moderate
Window Location Information Disclosure Vulnerability - CVE-2006-3640	Information Disclosure	Moderate	Moderate	Moderate	Low	Low
FTP Server Command Injection Vulnerability CVE-2004-1166	Elevation of Privilege	Low	Low	Low	Low	Low
Long URL Buffer Overflow Vulnerability CVE-2006-3869	Remote Code Execution	None	Critical	None	None	None
Long URL Buffer Overflow Vulnerability CVE-2006-3873	Remote Code Execution	Critical	Critical	None	Critical	None
Aggregate Severity of All Vulnerabilities		Critical	Critical	Critical	Critical	Critical

This assessment is based on the types of systems that are affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them.

Note By default, Internet Explorer on Windows Server 2003 runs in a restricted mode that is known as Enhanced Security Configuration. This mode mitigates some of the vulnerabilities. See the FAQ section for this security update for more information about Internet Explorer Enhanced Security Configuration.

Note The severity ratings for non-x86 operating system versions map to the x86 operating systems versions as follows:

•	The Microsoft Windows XP Professional x64 Edition severity rating is the same as the Windows XP Service Pack 2 severity rating.
•	The Microsoft Windows Server 2003 for Itanium-based Systems severity rating is the same as the Windows Server 2003 severity rating.
•	The Microsoft Windows Server 2003 with SP1 for Itanium-based Systems severity rating is the same as the Windows Server 2003 Service Pack 1 severity rating.
•	The Microsoft Windows Server 2003 x64 Edition severity rating is the same as the Windows Server 2003 Service Pack 1 severity rating.

Frequently Asked Questions (FAQ) Related to This Security Update

Vulnerability Details

* Redirect Cross-Domain Information Disclosure Vulnerability - CVE-2006-3280: An information disclosure vulnerability exists in Internet Explorer in the way that a redirect is handled. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read file data from a Web page in another Internet Explorer domain. This other Web page must use gzip encoding or some other compression type supported by Internet Explorer for any information disclosure to occur. This other Web page must also be cached on the client side for a successful exploit.

* HTML Layout and Positioning Memory Corruption Vulnerability - CVE-2006-3450:A remote code execution vulnerability exists in the way Internet Explorer interprets HTML with certain layout positioning combinations. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* CSS Memory Corruption Vulnerability - CVE-2006-3451:A remote code execution vulnerability exists in the way Internet Explorer handles chained Cascading Style Sheets (CSS). An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* HTML Rendering Memory Corruption Vulnerability - CVE-2006-3637: A remote code execution vulnerability exists in the way Internet Explorer interprets HTML with certain layout combinations. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* COM Object Instantiation Memory Corruption Vulnerability - CVE-2006-3638: A remote code execution vulnerability exists in the way Internet Explorer instantiates COM objects that are not intended to be instantiated in Internet Explorer. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* Source Element Cross-Domain Vulnerability - CVE-2006-3639: A remote code execution and information disclosure vulnerability exists in Internet Explorer in the way that a redirect is handled. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could read file data from a Web page in another Internet Explorer domain.

On Windows 2000 Service Pack 4 and Windows XP Service Pack 1 an attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* Window Location Information Disclosure Vulnerability - CVE-2006-3640: An information disclosure vulnerability exists in Internet Explorer where script can be persisted across navigations and used to gain access to the location of a Window in another domain or Internet Explorer zone. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could allow for information disclosure if a user viewed the Web page. An attacker who successfully exploited this vulnerability could gain access to the Window location of a Web page in another domain or Internet Explorer zone.

* FTP Server Command Injection Vulnerability - CVE-2004-1166: An elevation of privilege vulnerability exists in the way Internet Explorer handles specially crafted FTP links that contain line feeds. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow the attacker to issue FTP server commands if a user clicked on an FTP link. An attacker who successfully exploited this vulnerability could issue server commands as the user to servers.

* Long URL Buffer Overflow Vulnerability - CVE-2006-3869: A remote code execution vulnerability exists in the way Internet Explorer handles long URLs in when visiting websites using HTTP 1.1 protocol and compression. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

* Long URL Buffer Overflow Vulnerability - CVE-2006-3873: A remote code execution vulnerability exists in the way Internet Explorer handles long URLs in when visiting websites using HTTP 1.1 protocol and compression. An attacker could exploit the vulnerability by constructing a specially crafted Web page that could potentially allow remote code execution if a user viewed the Web page. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

Security Update Information

Affected Software:

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

* Windows Server 2003 (all versions)

* Windows XP Service Pack 2 (all versions) and Windows XP Professional x64 Edition

* Internet Explorer 6 Service Pack 1 for Windows XP Service Pack 1 (all versions) and Windows 2000 (all versions)

* Internet Explorer 5.01 Service Pack 4 on Windows 2000 (all versions)

Acknowledgments

Microsoft thanks the following for working with us to help protect customers:

Obtaining Other Security Updates:

Updates for other security issues are available at the following locations:

Support:

Security Resources:

Software Update Services:

By using Microsoft Software Update Services (SUS), administrators can quickly and reliably deploy the latest critical updates and security updates to Windows 2000 and Windows Server 2003-based servers, and to desktop systems that are running Windows 2000 Professional or Windows XP Professional.

For more information about how to deploy security updates by using Software Update Services, visit the Software Update Services Web site.

Windows Server Update Services:

By using Windows Server Update Services (WSUS), administrators can quickly and reliably deploy the latest critical updates and security updates for Windows 2000 operating systems and later, Office XP and later, Exchange Server 2003, and SQL Server 2000 onto Windows 2000 and later operating systems.

For more information about how to deploy security updates using Windows Server Update Services, visit the Windows Server Update Services Web site.

Systems Management Server:

Microsoft Systems Management Server (SMS) delivers a highly configurable enterprise solution for managing updates. By using SMS, administrators can identify Windows-based systems that require security updates and can perform controlled deployment of these updates throughout the enterprise with minimal disruption to end users. For more information about how administrators can use SMS 2003 to deploy security updates, visit the SMS 2003 Security Patch Management Web site. SMS 2.0 users can also use Software Updates Service Feature Pack to help deploy security updates. For information about SMS, visit the SMS Web site.

Note SMS uses the Microsoft Baseline Security Analyzer, the Microsoft Office Detection Tool, and the Enterprise Update Scan Tool to provide broad support for security bulletin update detection and deployment. Some software updates may not be detected by these tools. Administrators can use the inventory capabilities of the SMS in these cases to target updates to specific systems. For more information about this procedure, visit the following Web site. Some security updates require administrative rights following a restart of the system. Administrators can use the Elevated Rights Deployment Tool (available in the SMS 2003 Administration Feature Pack and in the SMS 2.0 Administration Feature Pack) to install these updates.

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.

Revisions:

[***** End Microsoft Security Bulletin MS06-042 (918899) *****]

   

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