__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Microsoft Exchange Server 5.5 Outlook Web Access Vulnerability [Microsoft Security Bulletin MS04-026] August 10, 2004 19:00 GMT Number O-197 ______________________________________________________________________________ PROBLEM: A cross-site scripting and spoofing vulnerability exists in the Exchange Server 5.5. This security bulletin replaces Microsoft Security Bulletin MS03-047 (CIAC Bulletin O-010). SOFTWARE: Microsoft Exchange Server 5.5 SP4 Outlook Web Access (Component) DAMAGE: This vulnerability could allow an attacker access to any data on the Outlook Web Access server that is accessible to an individual user. It may also be possible to exploit the vulnerability to manipulate Web browser caches and intermediate proxy server caches, and put spoofed content in those caches. SOLUTION: Install the security update. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An attacker who exploits this vulnerability ASSESSMENT: could convince a user to run a malicious script. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/o-197.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/bulletin/ MS04-026.mspx CVE/CAN: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CAN-2004-0203 ______________________________________________________________________________ [***** Start Microsoft Security Bulletin MS04-026 *****] Microsoft Security Bulletin MS04-026 Vulnerability in Exchange Server 5.5 Outlook Web Access Could Allow Cross-Site Scripting and Spoofing Attacks (842436) Issued: August 10, 2004 Version: 1.0 Summary Who should read this document: System administrators who have servers running Microsoftฎ Exchange Server 5.5 Outlookฎ Web Access Impact of Vulnerability: Remote Code Execution Maximum Severity Rating: Moderate Recommendation: Customers should consider applying the security update. Security Update Replacement: This update replaces the security update that is provided in Microsoft Security Bulletin MS03-047. Caveats: Customers who have customized any of the Active Server Pages (ASP) pages that are listed in the File Information section in this document should back up those files before they apply this update because those ASPs will be overwritten when the update is applied. Any customizations would then have to be reapplied to the new ASP pages. Version Requirements for Dependent Components for This Update: To install successfully, this update requires that the Microsoft Outlook Web Access server have either: Internet Explorer 5.01 Service Pack 3 (SP3) installed when using Windows 2000 SP3; Internet Explorer 5.01 SP4 installed when using Windows 2000 SP4; or Internet Explorer 6 SP1installed when using other supported operating systems. Version Recommendations for Dependent Components on the Outlook Web Access Server: At the time of this writing, the following versions are recommended for dependent components on the Outlook Web Access server: • Microsoft Internet Information Services (IIS): • IIS 4.0 on Windows NT 4.0 SP6 • IIS 5.0 on Windows 2000 SP3 or later • Microsoft Internet Explorer: • Internet Explorer 6.0 Tested Software and Security Update Download Locations: Affected Software: • Microsoft Exchange Server 5.5 SP4 Non-Affected Software: • Microsoft Exchange 2000 Server • Microsoft Exchange Server 2003 Affected Components: • Outlook Web Access - Download the update 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. Support for Outlook Web Access for Exchange Server 5.0 has ended. Top of sectionTop of section General Information Executive Summary: This update resolves a newly-discovered, privately reported vulnerability. A cross-site scripting and spoofing vulnerability exists in Outlook Web Access for Exchange Server 5.5 that could allow an attacker to convince a user to run a malicious script. The vulnerability is documented in the Vulnerability Details section of this bulletin. An attacker who successfully exploited the vulnerability could manipulate Web browser caches and intermediate proxy server caches, and put spoofed content in those caches. They may also be able to exploit the vulnerability to perform cross-site scripting attacks. We recommend that customers consider applying the security update. Note Customers who have customized any of the ASP pages that are listed in the File Information section in this document should back up those files before they apply this update because those ASPs will be overwritten when the update is applied. Any customizations would then have to be reapplied to the new ASP pages. See Microsoft Knowledge Base Article 327178 for the Microsoft support policy for the customization of Outlook Web Access. Severity Ratings and Vulnerability Identifiers: Vulnerability Identifiers: Cross-site Scripting and Spoofing Vulnerability - CAN-2004-0203 Impact of Vulnerability: Remote Code Execution Exchange Server 5.5: Moderate Vulnerability Details Cross-site and Spoofing Vulnerability - CAN-2004-0203 Security Update Information Installation Platforms and Prerequisites: For information about the specific security update for your platform, click the appropriate link: Exchange Server 5.5 Service Pack 4 Top of sectionTop of section Acknowledgments Microsoft thanks the following for working with us to help protect customers: Amit Klein of Sanctum Inc. for reporting the Cross-site Scripting and Spoofing Vulnerability (CAN-2004-0203). 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 xclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. Revisions: • V1.0 (August 10, 2004): Bulletin published [***** End Microsoft Security Bulletin MS04-026 *****] _______________________________________________________________________________ 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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