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  Microsoft Internet Information Services privilege escalation

  Microsoft Security Bulletin MS08-006 – Important Vulnerability in Internet Information Services Could Allow Remote Code Execution (942830)

From:MICROSOFT <secure_(at)_microsoft.com>
Date:12.02.2008
Subject:Microsoft Security Bulletin MS08-005 – Important Vulnerability in Internet Information Services Could Allow Elevation of Privilege (942831)

Microsoft Security Bulletin MS08-005 – Important
Vulnerability in Internet Information Services Could Allow Elevation of Privilege (942831)
Published: February 12, 2008

Version: 1.0
General Information
Executive Summary

This important update resolves a privately reported vulnerability in Internet Information Services (IIS). A local 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. 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.

The security update is rated Important for Microsoft Internet Information Services 5.0 on Microsoft Windows 2000, Microsoft Internet Information Services 5.1 on Windows XP, Microsoft Internet Information Server 6.0 on Windows Server 2003, and Microsoft Internet Information Services 7.0 on Windows Vista. For more information, see the subsection, Affected and Non-Affected Software, in this section.

For more information about this vulnerability, see the Frequently Asked Questions (FAQ) subsection under the next section, Vulnerability Information.

Recommendation. Microsoft recommends that customers apply the update at the earliest opportunity.

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 Component Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update

Microsoft Windows 2000 Service Pack 4


Microsoft Internet Information Services 5.0


Elevation of Privilege


Important


None

Windows XP Professional Service Pack 2


Microsoft Internet Information Services 5.1


Elevation of Privilege


Important


None

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


Microsoft Internet Information Services 5.1


Elevation of Privilege


Important


None

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


Microsoft Internet Information Services 6.0


Elevation of Privilege


Important


None

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


Microsoft Internet Information Services 6.0


Elevation of Privilege


Important


None

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


Microsoft Internet Information Services 6.0


Elevation of Privilege


Important


None

Windows Vista


Microsoft Internet Information Services7.0


Elevation of Privilege


Important


None

Windows Vista x64 Edition


Microsoft Internet Information Services 7.0


Elevation of Privilege


Important


None

Non-Affected Software
Operating System

Windows Vista Service Pack 1 (all editions)

Windows Server 2008 (all editions)
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Frequently Asked Questions (FAQ) Related to This Security Update

Which services are affected by this vulnerability on each Operating System?

The following table provides a list of each affected service per the affecte Operating System. Those services are World Wide Web Publishing Service (W3SVC), FTP Publishing Service (FTPSVC), and Network News Transport Protocol (NNTP). The only service that is enabled by default is W3SVC on Microsoft Windows 2000 Service Pack 4.
Operating System Service Affected

Microsoft Windows 2000 Service Pack 4


W3SVC, FTPSVC, NNTPSVC

Windows XP Professional Service Pack 2


W3SVC, FTPSVC

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


FTPSVC

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


FTPSVC, NNTPSVC

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


FTPSVC, NNTPSVC

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


FTPSVC, NNTPSVC

Windows Vista


FTPSVC

Windows Vista x64 Edition


FTPSVC

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 have been tested to determine which versions or editions are affected. Other versions or editions are past their support life cycle. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.

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

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 Microsoft Worldwide Information, 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 Information

Severity Ratings and Vulnerability Identifiers
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software File Change Notification Vulnerability - CVE-2008-0074 Aggregate Severity Rating

Microsoft Internet Information Services (IIS) 5.0 on Microsoft Windows 2000 Service Pack 4


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional Service Pack 2


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista


Important
Elevation of Privilege


Important

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista x64 Edition


Important
Elevation of Privilege


Important
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File Change Notification Vulnerability - CVE-2008-0074

A local elevation of privilege vulnerability exists in the way that the Internet Information Service handles file change notifications in the FTPRoot, NNTPFile\Root, and WWWRoot folders. An attacker who successfully exploited this vulnerability could execute arbitrary code in the context of local system. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2008-0074.

Mitigating Factors for File Change Notification Vulnerability - CVE-2008-0074

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:


On Windows XP Professional Service Pack 2 and Windows Server 2003, the IUSR_MACHINENAME account (used for anonymous access) does not have write access to the WWW root folders by default.


The specially crafted file or folder that would be required to exploit this vulnerability must be created locally. It could not be created through an FTP client connected to the FTP server service.


On Windows XP, Windows Server 2003, and Windows Vista, IIS is not installed or enabled by default.
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Workarounds for File Change Notification Vulnerability - CVE-2008-0074

Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:


On Windows Server 2003, stop the FTP and NNTP services

Exploitation of this vulnerability would require that the attacker have write access to the FTP root or NNTP root folders. By default the IIS anonymous access account, IUSR_MACHINENAME, has write access to the FTP root and NNTP root folders. Stopping these services will prevent the FTP and NNTP services from responding to change notifications for files in those directories. To stop the FTP and NNTP services, follow these steps:

From a command prompt, run the following commands:

net stop msftpsvc

net stop nntpsvc

Impact of workaround.Users will be unable to use the FTP and NNTP services.

How to undo the workaround.To undo the workaround, follow these steps:

From a command prompt, run the following commands:

net start msftpsvc

net start nntpsvc



Deny write access to the NNTP root, FTP root, and WWW root folders for any accounts that are used to execute user controlled ASP pages.

Verify that the WWW root folder does not allow write access for any accounts used to execute user controlled ASP pages. To deny write access to the NNTP root, FTP root, and WWW root folders follow these steps:

Note The ACLs of the WWW root folder should be verified to ensure that anonymous access user accounts do not have write access.

Note The following commands will deny the IIS anonymous user account write access to the default FTP and NNTP root directories of a machine named WS2003ENTSP1.

From a command prompt, run the following commands:

cacls c:\inetpub\ftproot /E /P IUSR_WS2003ENTSP1:R

cacls c:\inetpub\ftproot /E /P USERS:R

cacls c:\inetpub\nntpfile\root /E /P "ANONYMOUS LOGON":R

cacls c:\inetpub\nntpfile\root /E /P EVERYONE:R

Impact of workaround.Users will be denied write access to the NNTP root, FTP root, and WWW root folders for any accounts that are used to execute user-controlled ASP pages.

How to undo the workaround. Restore the ACLs on the folders to their previously configured setting.
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FAQ for File Change Notification Vulnerability - CVE-2008-0074

What is the scope of the vulnerability?
This is a local elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could execute arbitrary code in the context of local system.

What causes the vulnerability?
The vulnerability exists in the way that the Internet Information Service handles the file change notifications in the FTPRoot, NNTPFile\Root, and WWWRoot folders.

What might an attacker use the vulnerability to do?
A local attacker could successfully exploit this vulnerability to gain full control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights.

How could an attacker exploit the vulnerability?
A local attacker would have to be able to create or modify a file only in the FTPRoot, NNTPFile\Root, or WWWRoot directory. Virtual directories and sub-directories are not affected. A remote attacker would have to be able to upload a script to an affected IIS server, and be able to run the script. This uploaded script would need write access to the FTPRoot, NNTPFile\Root, or WWWRoot folders.

What systems are primarily at risk from the vulnerability?
Web hosting providers that allow their customers to upload ASP pages to their hosted web sites are primarily at risk from exploitation of this vulnerability. In addition, Microsoft Windows 2000 Service Pack 4 systems running IIS 5.0 are at risk from this vulnerability because IIS is enabled by default. Supported editions of Windows XP, Windows Server 2003, and Windows Vista are also at risk if the service is enabled.

What does the update do?
The update removes the vulnerability by modifying the way that the Internet Information Service handles file change notifications in the FTPRoot, NNTPFile\Root, and WWWRoot folders.

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.
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Update Information

Detection and Deployment Tools and Guidance

Manage the software and security updates you need to deploy to the servers, desktop, and mobile computers in your organization. For more information see the TechNet Update Management Center. The Microsoft TechNet Security Web site provides additional information about security in Microsoft products.

Security updates are available from Microsoft Update, Windows Update, and Office Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update."

Finally, security updates can be downloaded from the Microsoft Update Catalog. The Microsoft Update Catalog provides a searchable catalog of content made available through Windows Update and Microsoft Update, including security updates, drivers and service packs. By searching using the security bulletin number (such as, “MS07-036”), you can add all of the applicable updates to your basket (including different languages for an update), and download to the folder of your choosing. For more information about the Microsoft Update Catalog, see the Microsoft Update Catalog FAQ.

Detection and Deployment Guidance

Microsoft has provided detection and deployment guidance for this month’s security updates. This guidance will also help IT professionals understand how they can use various tools to help deploy the security update, such as Windows Update, Microsoft Update, Office Update, the Microsoft Baseline Security Analyzer (MBSA), the Office Detection Tool, Microsoft Systems Management Server (SMS), and the Extended Security Update Inventory Tool. For more information, see Microsoft Knowledge Base Article 910723.

Microsoft Baseline Security Analyzer

Microsoft Baseline Security Analyzer (MBSA) allows administrators to scan local and remote systems for missing security updates as well as common security misconfigurations. For more information about MBSA, visit Microsoft Baseline Security Analyzer.

The following table provides the MBSA detection summary for this security update.
Software MBSA 2.0.1

Microsoft Internet Information Services (IIS) 5.0 on Microsoft Windows 2000 Service Pack 4


Yes

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional Service Pack 2


Yes

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems


No

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista


See Note for Windows Vista below

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista x64 Edition


See Note for Windows Vista below

Note for Windows Vista Microsoft does not support installing MBSA 2.0.1 on computers that run Windows Vista, but you may install MBSA 2.0.1 on a supported operating system and then scan the Windows Vista-based computer remotely. For additional information about MBSA support for Windows Vista, visit the MBSA Web site. See also Microsoft Knowledge Base Article 931943: Microsoft Baseline Security Analyzer (MBSA) support for Windows Vista.

For more information about MBSA 2.0.1, see MBSA 2.0 Frequently Asked Questions.

Windows Server Update Services

By using Windows Server Update Services (WSUS), administrators can 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 to Windows 2000 and later operating systems. For more information about how to deploy this security update using Windows Server Update Services, visit the Windows Server Update Services Web site.

Systems Management Server

The following table provides the SMS detection and deployment summary for this security update.
Software SMS 2.0 SMS 2003 SCCM 2007

Microsoft Internet Information Services (IIS) 5.0 on Microsoft Windows 2000 Service Pack 4


Yes


Yes


Yes

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional Service Pack 2


Yes


Yes


Yes

Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2


No


Yes


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2


Yes


Yes


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition Service Pack 2


No


Yes


Yes

Microsoft Internet Information Services (IIS) 6.0 on Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium-based Systems


No


Yes


Yes

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista


No


See Note for Windows Vista below


Yes

Microsoft Internet Information Services (IIS) 7.0 on Windows Vista x64 Edition


No


See Note for Windows Vista below


Yes

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. See also Downloads for Systems Management Server 2.0.

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, see SMS 2003 Inventory Tool for Microsoft Updates. SMS 2003 can also use the Microsoft Office Inventory Tool to detect required updates for Microsoft Office applications. For more information about the Office Inventory Tool and other scanning tools, see SMS 2003 Software Update Scanning Tools. See also Downloads for Systems Management Server 2003.

System Center Configuration Manager (SCCM) 2007 uses WSUS 3.0 for detection of updates. For more information about SCCM 2007 Software Update Management, visit System Center Configuration Manager 2007.

Note for Windows Vista  Microsoft Systems Management Server 2003 with Service Pack 3 includes support for Windows Vista manageability.

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.

Other Information
Support


Customers in the U.S. and Canada can receive technical support from Microsoft Product Support Services at 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates.


International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.

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.
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Revisions


V1.0 (February 12, 2008) Bulletin published.

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