__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Web View in Windows Explorer Vulnerability [MS05-024 Vulnerability in Web View Could Allow Remote Code Execution (894320)] May 10, 2005 18:00 GMT Number P-202 ______________________________________________________________________________ PROBLEM: A vulnerability was recently discovered in the way Web View in Windows Explorer validates HTML characters in preview fields. Web View allows users to preview documents in a thumbnail view before opening. PLATFORM: Microsoft Windows 2000 SP3 and SP4 Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (ME) DAMAGE: An attacker could carefully craft a malicious file and then persuade a victim to preview it in Windows Explorer Web View. The malicious file could be saved from an email message or downloaded from a website. Previewing the file could lead to execution of arbitrary code in the context of the logged in user. SOLUTION: Apply available security updates. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. This may lead to execution of arbitrary ASSESSMENT: code if an attacker persuaded a victim to preview a malicious file using Windows Explorer Web View. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/p-202.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/Bulletin/MS05-024. mspx?pf=true CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CAN-2005-1191 ______________________________________________________________________________ [***** Start MS05-024 Vulnerability in Web View Could Allow Remote Code Execution (894320) *****] Microsoft Security Bulletin MS05-024 Vulnerability in Web View Could Allow Remote Code Execution (894320) Issued: May 10, 2005 Version: 1.0 Summary Who should read this document: Customers who use Microsoft Windows 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: None Tested Software and Security Update Download Locations: Affected Software: • Microsoft Windows 2000 Service Pack 3 and Microsoft Windows 2000 Service Pack 4 – Download the update • Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (ME) – Review the FAQ section of this bulletin for details about these operating systems. Non-Affected Software: • Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2 • Microsoft Windows XP 64-Bit Edition Service Pack 1 (Itanium) • Microsoft Windows XP 64-Bit Edition Version 2003 (Itanium) • 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 SP1 for Itanium-based Systems • Microsoft Windows Server 2003 x64 Edition 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. General Information Executive Summary Executive Summary: This update resolves a newly-discovered, public vulnerability. A remote code execution vulnerability exists in the way that Web View in Windows Explorer handles certain HTML characters in preview fields. By persuading a user to preview a malicious file, an attacker could execute arbitrary code in the context of the logged on user. The vulnerability is documented in the “Vulnerability Details” section of this bulletin. If a user is logged on with administrative user rights, 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. 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. However, user interaction is required to exploit this vulnerability. We recommend that customers apply the update at the earliest opportunity. Severity Ratings and Vulnerability Identifiers: Vulnerability Identifiers - Web View Script Injection Vulnerability – CAN-2005-1191 Impact of Vulnerability - Remote Code Execution Windows 98, 98 SE, ME - Not Critical Windows 2000 - 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. Top of section Frequently asked questions (FAQ) related to this security update Vulnerability Details Security Update Information Affected Software: For information about the specific security update for your affected software, click the appropriate link: Windows 2000 (all versions) 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 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, 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 (May 10, 2005): Bulletin published [***** End MS05-024 Vulnerability in Web View Could Allow Remote Code Execution (894320) *****] _______________________________________________________________________________ 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. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) P-193: Mozilla Security Bugs P-194: Buffer Overflow in “sharutils” P-195: CVS Vulnerabilities P-196: HP OpenView Radia Management Portal and Agent Vulnerability P-197: PHP Security Bugs P-198: HP OpenView Network Node Manager (OV NNM) Remote Unauthorized Privileged Code Execution, Denial of Service (DoS) P-199: HP OpenView Event Correlation Services (OV ECS) Remote Unauthorized Privileged Code Execution, Denial of Service (DoS) P-200: Apple Security Update 2005-005 CIACTech05-001: Operation of the Sinit/Calypso Worm P-201: iTunes MPEG4 Parsing Buffer Overflow