__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft ASP.NET Path Validation Vulnerability [Microsoft Security Bulletin MS05-004] February 9, 2005 13:00 GMT Number P-127 [REVISED 16 Feb 2005] [REVISED 17 Mar 2005] [REVISED 16 JUN 2005] ______________________________________________________________________________ PROBLEM: A path validation vulnerability was discovered in ASP.NET. The canonicalization routine that is used by ASP.NET to map the request does not correctly parse the URL. PLATFORM: Microsoft .NET Framework 1.0 Windows 2000 Service Pack 3 or Service Pack 4 Windows XP Service Pack 1 or Windows XP Service Pack 2 Windows Server 2003 Windows XP Tablet PC Edition Windows XP Media Center Edition Windows 2000 Service Pack 3 or Service Pack 4 Windows XP Service Pack 1 or Windows XP Service Pack 2 Windows Server 2003 Windows XP Tablet PC Edition Windows XP Media Center Edition Microsoft .NET Framework 1.1 Windows 2000 Service Pack 3 or Service Pack 4 Windows XP Service Pack 1 or Windows XP Service Pack 2 Windows XP Tablet PC Edition Windows XP Media Center Edition Windows Server 2003 Windows 2000 Service Pack 3 or Service Pack 4 Windows XP Service Pack 1 or Windows XP Service Pack 2 Windows XP Tablet PC Edition Windows XP Media Center Edition Windows Server 2003 DAMAGE: This is an information disclosure vulnerability that could lead to an elevation privilege in some cases. An attacker who successfully exploited this vulnerability could gain unauthorized access to parts of a Web site. The actions that the attacker could take would depend on the specific content being protected. SOLUTION: Apply the available security update. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An attacker could exploit the vulnerability ASSESSMENT: by creating a specially crafted URL and sending the URL to an affected system, which could then allow the attacker to bypass the Web site's security. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-127.shtml ORIGINAL BULLETIN: Microsoft Security Bulletin MS05-004 http://www.microsoft.com/technet/security/bulletin/ms05-004.mspx CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CAN-2004-0847 ______________________________________________________________________________ REVISION HISTORY: 03/17/2005 - updated Microsoft Security Bulletin MS05-004 to include updated Caveats section. 06/16/2005 - updated Microsoft Security Bulletin MS05-004 to include Microsofts updated Software Section for Windows XP Tablet PC Edition and Windows XP Media Center Edition. [***** Start Microsoft Security Bulletin MS05-004 *****] Microsoft Security Bulletin MS05-004 ASP.NET Path Validation Vulnerability (887219) Issued: February 8, 2005 Updated: June 14, 2005 Version: 2.0 Summary Who should read this document: Customers who use Microsoftฎ Windowsฎ .NET Framework Impact of Vulnerability: Information Disclosure, possible Elevation of Privilege Maximum Severity Rating: Important Recommendation: Customers should install the update at the earliest opportunity. Security Update Replacement: None. Caveats: Microsoft Knowledge Base Article 887219 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 887219. Tested Software and Security Update Download Locations: Affected Software: Microsoft .NET Framework 1.0 • Download the update for .NET Framework 1.0 Service Pack 3 for the following operating system versions (886906): • Windows 2000 Service Pack 3 or Service Pack 4 • Windows XP Service Pack 1 or Windows XP Service Pack 2, • Windows Server 2003 • Download the update for .NET Framework 1.0 Service Pack 3 for the following operating system versions (887998): • Windows XP Tablet PC Edition • Windows XP Media Center Edition • Download the update for .NET Framework 1.0 Service Pack 2 for the following operating system versions (886905): • Windows 2000 Service Pack 3 or Service Pack 4 • Windows XP Service Pack 1 or Windows XP Service Pack 2, • Windows Server 2003 • Download the update for .NET Framework 1.0 Service Pack 2 for the following operating system versions (887999): • Windows XP Tablet PC Edition • Windows XP Media Center Edition Microsoft .NET Framework 1.1 • Download the update for .NET Framework 1.1 Service Pack 1 for the following operating system versions (886903): • Windows 2000 Service Pack 3 or Service Pack 4 • Windows XP Service Pack 1 or Windows XP Service Pack 2, • Windows XP Tablet PC Edition • Windows XP Media Center Edition • Download the update for .NET Framework 1.1 Service Pack 1 for the following operating system versions (886903): • Windows Server 2003 • Download the update for .NET Framework 1.1 for the following operating system versions (886904): • Windows 2000 Service Pack 3 or Service Pack 4 • Windows XP Service Pack 1 or Windows XP Service Pack 2, • Windows XP Tablet PC Edition • Windows XP Media Center Edition • Download the update for .NET Framework 1.1 for the following operating system versions (886904): • Windows Server 2003 Top of section Non-Affected Software: • None Affected Components: • ASP.NET The software in this list has been tested to determine if the versions are affected. Other versions either no longer include security update support or may not be affected. To determine the support lifecycle for your product and version, visit the following Microsoft Support Lifecycle Web site. Top of section General Information This update resolves a public vulnerability in ASP.NET that could allow an attacker to bypass the security of an ASP.NET Web site and gain unauthorized access. The vulnerability is documented in the Vulnerability Details section of this bulletin. An attacker who successfully exploited this vulnerability could gain unauthorized access to parts of a Web site. The actions that the attacker could take would depend on the specific content being protected. Severity Ratings and Vulnerability Identifiers: Vulnerability Identifiers Impact of Vulnerability .NET Framework 1.0 .NET Framework 1.1 Path Validation Vulnerability - CAN-2004-0847 Information Disclosure, Elevation of Privilege 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. Security Update Information Installation Platforms and Prerequisites: For information about the specific security update for your platform, click the appropriate link: • The Microsoft .NET Framework version 1.0 Service Pack 3 • The Microsoft .NET Framework version 1.0 Service Pack 2 • The Microsoft .NET Framework version 1.1 Service Pack 1 • The Microsoft .NET Framework version 1.1 Obtaining Other Security Updates: Updates for other security issues are available from the following locations: • Security updates are available from the Microsoft Download Center: You can find them most easily by doing a keyword search for "security_patch". • Updates for consumer platforms are available from the Windows 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 Baseline Security Analyzer (MBSA) • Windows 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 this security update with Software Update Services, visit the Software 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 to 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, see 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 and the Microsoft Office Detection 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, see 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 (February 8, 2005): Bulletin published • V1.1 (February 15, 2005): Bulletin updated to include Knowledge Base Article numbers for each individual download under Affected Products. • V1.2 (March 16, 2005): Bulletin “Caveats” section has been updated to document known issues that customers may experience when installing the available security updates. • V2.0 (June 14, 2005): Bulletin updated to announce the availability of an updated package for .NET Framework 1.0 Service Pack 3 for the following operating system versions: (887998) Windows XP Tablet PC Edition and Windows XP Media Center Edition. [***** End Microsoft Security Bulletin MS05-004 *****] _______________________________________________________________________________ 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 Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 925-422-8193 (7x24) FAX: +1 925-423-8002 STU-III: +1 925-423-2604 E-mail: ciac@ciac.org Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://www.ciac.org/ Anonymous FTP: ftp.ciac.org PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. 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