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From:MICROSOFT <secure_(at)_microsoft.com>
Date:11.04.2007
Subject:Microsoft Security Bulletin MS07-022 Vulnerability in Windows Kernel Could Allow Elevation of Privilege (931784)

Microsoft Security Bulletin MS07-022
Vulnerability in Windows Kernel Could Allow Elevation of Privilege (931784)
Published: April 10, 2007

Version: 1.0
Summary

Who Should Read this Document: Customers who use Microsoft Windows

Impact of Vulnerability: Elevation of Privilege

Maximum Severity Rating: Important

Recommendation: Customers should apply the update at the earliest opportunity

Security Update Replacement: This bulletin replaces a prior security update. See the Frequently Asked Questions (FAQ) section of this bulletin for details.

Tested Software and Security Update Download Locations:

Affected Software:


Microsoft Windows 2000 Service Pack 4 — Download the update


Microsoft Windows XP Service Pack 2 — Download the update


Microsoft Windows Server 2003, Microsoft Windows Server 2003 Service Pack 1, and Microsoft 2003 Service Pack 2 — Download the update

Non-Affected Software:


Microsoft Windows XP Professional x64 Edition and Microsoft Windows XP Professional x64 Edition Service Pack 2


Microsoft Windows Server 2003 x64 Edition and Microsoft Windows Server 2003 x64 Edition Service Pack 2


Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with SP1 and SP2 for Itanium-based Systems


Windows Vista


Windows Vista x64 Edition

The software in this list has been tested to determine whether the versions are affected. Other versions are either past their support life cycle or are not affected. To determine the support life cycle for your product and version, visit the Microsoft Support Lifecycle Web site.
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General Information

Executive Summary

Executive Summary:

This update resolves a newly discovered, privately reported vulnerability. The vulnerability is documented in its own subsection in the Vulnerability Details section of this bulletin.

An attacker who successfully exploited this vulnerability 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.

We recommend that customers apply the update at the earliest opportunity.

Severity Ratings and Vulnerability Identifiers:
Vulnerability Identifiers Impact of Vulnerability Microsoft Windows 2000 Service Pack 4 Microsoft Windows XP Service Pack 2 Microsoft Windows Server 2003 Microsoft Windows Server 2003 Service Pack 1 Microsoft Windows Server 2003 Service Pack 2

Kernel Local Elevation of Privilege Vulnerability - CVE-2007-1206


Elevation of Privilege


Important


Important


Important


Important


Important

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.
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Frequently Asked Questions (FAQ) Related to This Security Update

What updates does this release replace?
This security update replaces a prior security update. The security bulletin ID and affected operating systems are listed in the following table.
Bulletin ID Microsoft Windows 2000 Service Pack 4 Microsoft Windows XP Service Pack 2 Microsoft Windows Server 2003 Microsoft Windows Server 2003 Service Pack 1 Microsoft Windows Server 2003 Service Pack 2

MS06-049


Replaced


Not Applicable


Not Applicable


Not Applicable


Not Applicable

Can I use the Microsoft Baseline Security Analyzer (MBSA) to determine whether this update is required?
The following table provides the MBSA detection summary for this security update.
Product MBSA 1.2.1 MBSA 2.0.1

Microsoft Windows 2000 Service Pack 4


Yes


Yes

Microsoft Windows XP Service Pack 2


Yes


Yes

Microsoft Windows Server 2003, Microsoft Windows Server 2003 Service Pack 1, and Microsoft Windows Server 2003 Service Pack 2


Yes


Yes

For more information about MBSA, visit the MBSA Web site. For more information about the programs that Microsoft Update and MBSA 2.0 currently do not detect, see Microsoft Knowledge Base Article 895660.

For more detailed information, see Microsoft Knowledge Base Article 910723: Summary list of monthly detection and deployment guidance articles.

Can I use Systems Management Server (SMS) to determine whether this update is required?
The following table provides the SMS detection summary for this security update.
Product SMS 2.0 SMS 2003

Microsoft Windows 2000 Service Pack 4


Yes


Yes

Microsoft Windows XP Service Pack 2


Yes


Yes

Microsoft Windows Server 2003, Microsoft Windows Server 2003 Service Pack 1, and Microsoft Windows Server 2003 Service Pack 2


Yes


Yes

SMS 2.0 and SMS 2003 Software Update Services (SUS) Feature Pack can use MBSA 1.2.1 for detection and therefore have the same limitation that is listed earlier in this bulletin related to programs that MBSA 1.2.1 does not detect.

For SMS 2.0, the SMS SUS Feature Pack, which includes the Security Update Inventory Tool (SUIT), can be used by SMS to detect security updates. SMS SUIT uses the MBSA 1.2.1 engine for detection. For more information about SUIT, visit the following Microsoft Web site. For more information about the limitations of SUIT, see Microsoft Knowledge Base Article 306460. The SMS SUS Feature Pack also includes the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications.

For SMS 2003, the SMS 2003 Inventory Tool for Microsoft Updates (ITMU) can be used by SMS to detect security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 ITMU, visit the following Microsoft Web site. SMS 2003 can also use the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications.

For more information about SMS, visit the SMS Web site.

For more detailed information, see Microsoft Knowledge Base Article 910723: Summary list of monthly detection and deployment guidance articles.

I am using an older version of the software discussed in this security bulletin; what should I do?
The affected software listed in this bulletin has been tested to determine whether the versions are affected. Other versions are past their support life cycle. To determine the support life cycle for your product and version, visit the Microsoft Support Lifecycle Web site.

It should be a priority for customers who have older versions of the software to migrate to supported versions to prevent potential exposure to vulnerabilities. For more information about the Windows Product Lifecycle, visit the following Microsoft Support Lifecycle Web site. For more information about the extended security update support period for these operating system versions, visit the Microsoft Product Support Services Web site.

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, 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 Windows Operating System Product Support Lifecycle FAQ.
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Vulnerability Details

Kernel Local Elevation of Privilege Vulnerability - CVE-2007-1206:

A privilege elevation vulnerability exists in Windows Kernel because of incorrect permissions on a mapped memory segment. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

Mitigating Factors for Kernel Local Elevation of Privilege Vulnerability - CVE-2007-1206:

An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
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Workarounds for Kernel Local Elevation of Privilege Vulnerability - CVE-2007-1206:

We have not identified any workarounds for this vulnerability.
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FAQ for Kernel Local Elevation of Privilege Vulnerability - CVE-2007-1206:

What is the scope of the vulnerability?
A privilege elevation vulnerability exists in Windows Kernel because of incorrect permissions on a mapped memory segment. An attacker who successfully exploited this vulnerability could take complete control of an affected system. To attempt to exploit the vulnerability, an attacker must be able to log on locally to the system.

What causes the vulnerability?
The Windows Kernel allows for incorrect permissions to be used when mapping a memory segment.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run arbitrary code on a user’s system with elevated privileges. This could allow an attacker to take complete control of the affected system.

How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and gain complete control over the affected system.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

Could the vulnerability be exploited over the Internet?
No. An attacker must be able to log on to the specific system that is targeted for attack. An attacker cannot load and run a program remotely by using this vulnerability.

What does the update do?
The update removes the vulnerability by modifying the way that the Windows Kernel validates permissions during memory mapping.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure. Microsoft had not received any information to indicate that this vulnerability had been publicly disclosed when this security bulletin was originally issued.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.

Acknowledgments

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


eEye for reporting the Kernel Local Elevation of Privilege Vulnerability (CVE-2007-1206).


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:


V1.0 (April 10, 2007): Bulletin published.

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