__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
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__________________________________________________________
INFORMATION BULLETIN
Vulnerability in Microsoft Internet Information Services using Active Server Pages
[Microsoft Security Bulletin MS06-034 (917537)]
July 12, 2006 18:00 GMT Number Q-241
______________________________________________________________________________
PROBLEM: There is a remote code execution vulnerability in Internet
Information Services (IIS). An attacker could exploit the
vulnerability by constructing a specially crafted Active Server
Pages (ASP) file, potentially allowing remote code execution if
the Internet Information Services (IIS) processes the specially
crafted file. An attacker who successfully exploited this
vulnerability could take complete control of an affected
system.
PLATFORM: Microsoft Windows 2000 Service Pack 4
Microsoft Windows XP Professional Service Pack 1 and Microsoft
Windows XP Professional Service Pack 2
Microsoft Windows XP Professional x64 Edition
Microsoft Windows Server 2003 and Microsoft Windows Server 2003
Service Pack 1
Microsoft Windows Server 2003 for Itanium-based Systems and
Microsoft Windows Server 2003 with Service Pack 1 for
Itanium-based Systems
Microsoft Windows Server 2003 x64 Edition family
DAMAGE: 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.
SOLUTION: Apply current patches.
______________________________________________________________________________
VULNERABILITY The risk is MEDIUM. An attacker who successfully exploited this
ASSESSMENT: vulnerability could take complete control of an affected
system.
______________________________________________________________________________
LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-241.shtml
ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/Bulletin/MS06-034.mspx
CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0026
______________________________________________________________________________
REVISION HISTORY:
07/21/2006 - revised to reflect where Microsoft has revised MS06-034 where they
updated the "Caveats" section.
[***** Start Microsoft Security Bulletin MS06-034 (917537) *****]
Microsoft Security Bulletin MS06-034
Vulnerability in Microsoft Internet Information Services using Active Server Pages Could Allow Remote Code Execution (917537)
Published: July 11, 2006 | Updated: July 19, 2006
Version: 1.2
Summary
Who Should Read this Document: Customers who use Microsoft Internet Information Services (IIS)
Impact of Vulnerability: Remote Code Execution
Maximum Severity Rating: Important
Recommendation: Customers should apply the update at the earliest opportunity.
Security Update Replacement: None
Caveats: Microsoft Knowledge Base Article 917537 documents the currently known
issues that customers may experience when they install this security update. The
article also documents recommended solutions for these issues. For more information,
see Microsoft Knowledge Base Article 917537.
Tested Software and Security Update Download Locations:
Affected Software:
•
Microsoft Windows 2000 Service Pack 4 — Download the update
•
Microsoft Windows XP Professional Service Pack 1 and Microsoft Windows XP Professional Service Pack 2 — Download the update
•
Microsoft Windows XP Professional x64 Edition — Download the update
•
Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1 — Download the update
•
Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with Service Pack 1 for Itanium-based
Systems — Download the update
•
Microsoft Windows Server 2003 x64 Edition family — Download the update
Affected Components:
•
Microsoft Internet Information Services (IIS) 6.0
•
Microsoft Internet Information Services (IIS) 5.1
•
Microsoft Internet Information Services (IIS) 5.0
Non-Affected Software:
•
Microsoft Windows XP Home Service Pack 1 and Microsoft Windows XP Home Service Pack 2
The software in this list has been tested to determine whether the versions are affected. Other versions either no longer include
security update support or may not be affected. To determine the support life cycle for your product and version, visit the
Microsoft Support Lifecycle Web site.
Note The security updates for Microsoft Windows Server 2003, Windows Server 2003 Service Pack 1, and Windows Server 2003 x64 Edition
also apply to Windows Server 2003 R2.
Top of sectionTop of section
General Information
Executive Summary
Executive Summary:
This update resolves a newly discovered, privately reported vulnerability. The vulnerability is documented 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.
An attacker must have valid logon credentials, but if a server has been purposely configured to allow users, either anonymous or
authenticated, to upload web content such as .ASP pages to web sites, the server could be exploited by this vulnerability.
We recommend that customers apply the update at the earliest opportunity.
Severity Ratings and Vulnerability Identifiers:
Vulnerability Identifiers Impact of Vulnerability Microsoft Internet Information Services (IIS) 6.0 on Windows 2003 (all versions)
Microsoft Internet Information Services (IIS) 5.1 on Windows XP Professional Service Pack 1, Microsoft Windows XP Professional
Service Pack 2 and Windows XP Professional x64 Edition Microsoft Internet Information Services (IIS) 5.0 on Windows 2000 Service Pack 4
Internet Information Services using Malformed Active Server Pages Vulnerability - CVE-2006-0026
Remote Code Execution
Moderate
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.
Note The security updates for Microsoft Windows Server 2003, Windows Server 2003 Service Pack 1, and Windows Server 2003 x64 Edition also
apply to Windows Server 2003 R2.
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.
Top of sectionTop of section
Vulnerability Details
Internet Information Services Using Malformed Active Server Pages Vulnerability - CVE-2006-0026
There is a remote code execution vulnerability in Internet Information Services (IIS). An attacker could exploit the vulnerability by
constructing a specially crafted Active Server Pages (ASP) file, potentially allowing remote code execution if the Internet Information Services
(IIS) processes the specially crafted file. An attacker who successfully exploited this vulnerability could take complete control of an affected
system.
Mitigating Factors for Internet Information Services Using Malformed Active Server Pages ASP Vulnerability - CVE-2006-0026:
•
On IIS 5.0 and IIS 5.1, ASP enabled applications by default run in the 'Pooled Out of Process' application, which means they run in DLLHOST.exe,
which is running in the context of the low privilege IWAM_<machinename> account.
•
By default, IIS 5.1 on Windows XP Professional and IIS 6.0 on Windows Server 2003 are not enabled.
•
By default, ASP is not enabled on IIS 6.0. If ASP is enabled, it runs in the context of a W3WP.exe worker process running as the low privilege
'NetworkService' account.
•
An attacker would require valid logon credentials to exploit this vulnerability. However, if a server has been intentionally configured to allow
users, either anonymous or authenticated, to upload web content such as .ASP pages to web sites, the server could be attacked successfully by
exploiting by this vulnerability.
Top of sectionTop of section
Acknowledgments
Microsoft thanks the following for working with us to help protect customers:
•
Brett Moore of Security-Assessment.com for reporting the Internet Information Services using Malformed Active Server Pages Vulnerability -
CVE-2006-0026.
Obtaining Other Security Updates:
Updates for other security issues are available at the following locations:
•
Security updates are available at the Microsoft Download Center. You can find them most easily by doing a keyword search for "security_patch."
•
Updates for consumer platforms are available at the Microsoft Update Web site.
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.
Security Resources:
•
The Microsoft TechNet Security Web site provides additional information about security in Microsoft products.
•
Microsoft Software Update Services
•
Microsoft Windows Server Update Services
•
Microsoft Baseline Security Analyzer (MBSA)
•
Windows Update
•
Microsoft Update
•
Windows Update Catalog: For more information about the Windows Update Catalog, see Microsoft Knowledge Base Article 323166.
•
Office Update
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 Scanning 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:
• V1.0 (July 11, 2006): Bulletin published.
• V1.1 (July 12, 2006): Bulletin updated to provide clarity around the
“File Information” for Windows XP in the “Security Update Section”.
• V1.2 (July 19, 2006): Bulletin updated “Caveats” Section.
Top of pageTop of page
[***** End Microsoft Security Bulletin MS06-034 (917537) *****]
_______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Microsoft for the
information contained in this bulletin.
_______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
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This document was prepared as an account of work sponsored by an
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employees, makes any warranty, express or implied, or assumes any
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