__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Vulnerabilities in Outlook Web Access for Exchange Server [Microsoft Security Bulletin (MS08-039)] July 8, 2008 19:00 GMT Number S-339 [REVISED 30 Jul 2008] ______________________________________________________________________________ PROBLEM: There is a cross-site scripting vulnerability in the affected versions of Outlook Web Access (OWA) for Exchange Server. Exploitation of the vulnerability could lead to elevation of privilege on individual OWA clients connecting to Outlook Web Access for Exchange Server. PLATFORM: Microsoft Exchange Server 2003 and 2007 (all editions) DAMAGE: Elevation of privilege. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is LOW. To exploit the vulnerability, an attacker ASSESSMENT: would have to convince a user to open a specially crafted e-mail that would run malicious script from within an individual OWA client. If the malicious script is executed, the script would run inthe security context of the user's OWA session and could perform any action that user could perform such as reading, sending, and deleting e-mail as the logged-on user. ______________________________________________________________________________ CVSS 2 BASE SCORE: 6.4 TEMPORAL SCORE: 5.0 VECTOR: (AV:N/AC:L/Au:N/C:P/I:P/A:N/E:POC/RL:OF/RC:C) ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-339.shtml ORIGINAL BULLETIN: http://www.microsoft.com/technet/security/Bulletin/MS08-039.mspx CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2008-2247 CVE-2008-2248 ______________________________________________________________________________ REVISION HISTORY: 07/30/2008 - revised S-339 to reflect changes Microsoft has made in MS08-039 where they added Microsoft Exchange Server 2000 Service pack 3 as non-affected software. Also provided links to additional information on Outlook Web Access Light and Outlook Web Access Premium in the Mitigating Factors Sections. Finally, updated the applicable software under the "Windows Server Update Services" heading in the section, Detection and Deployment Tools and Guidance. [***** Start Microsoft Security Bulletin (MS08-039) *****] Microsoft Security Bulletin MS08-039 – Important Vulnerabilities in Outlook Web Access for Exchange Server Could Allow Elevation of Privilege (953747) Published: July 8, 2008 | Updated: July 16, 2008 Version: 1.2 General Information Executive Summary This security update resolves two privately reported vulnerabilities in Outlook Web Access (OWA) for Microsoft Exchange Server. An attacker who successfully exploited these vulnerabilities could gain access to an individual OWA client’s session data, allowing elevation of privilege. The attacker could then perform any action the user could perform from within the individual client’s OWA session. This security update is rated Important for all supported editions of Microsoft Exchange Server 2003 and Microsoft Exchange Server 2007. For more information, see the subsection, Affected and Non-Affected Software, in this section. The security update addresses the vulnerabilities by modifying the validation of HTTP session data within OWA. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information. Recommendation. Microsoft recommends that customers apply the update at the earliest opportunity. Known Issues. Microsoft Knowledge Base Article 953747 documents the currently known issues that customers may experience when installing this security update. Top of section 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 Software Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update Microsoft Exchange Server 2003 Service Pack 2 Elevation of Privilege Important None (See Update FAQ for additional details) Microsoft Exchange Server 2007 Elevation of Privilege Important MS07-026 Microsoft Exchange Server 2007 Service Pack 1 Elevation of Privilege Important None (See Update FAQ for additional details) Vulnerability Information Severity Ratings and Vulnerability Identifiers Vulnerability Severity Rating and Maximum Security Impact by Affected Software Affected Software Outlook Web Access for Exchange Server Data Validation Cross-Site Scripting Vulnerability - CVE-2008-2247 Outlook Web Access for Exchange Server Parsing Cross-Site Scripting Vulnerability - CVE-2008-2248 Aggregate Severity Rating Microsoft Exchange Server 2003 Service Pack 2 Important Elevation of Privilege Not applicable Important Microsoft Exchange Server 2007 Not applicable Important Elevation of Privilege Important Microsoft Exchange Server 2007 Service Pack 1 Not applicable Important Elevation of Privilege Important Top of section Outlook Web Access for Exchange Server Data Validation Cross-Site Scripting Vulnerability - CVE-2008-2247 This is a cross-site scripting vulnerability in the affected versions of Outlook Web Access (OWA) for Exchange Server. Exploitation of the vulnerability could lead to elevation of privilege on individual OWA clients connecting to Outlook Web Access for Exchange Server. To exploit the vulnerability, an attacker would have to convince a user to open a specially crafted e-mail that would run malicious script from within an individual OWA client. If the malicious script is executed, the script would run in the security context of the user’s OWA session and could perform any action the user could perform such as reading, sending, and deleting e-mail as the logged-on user. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2008-2247. Outlook Web Access for Exchange Server HTML Parsing Cross-Site Scripting Vulnerability - CVE-2008-2248 This is a cross-site scripting vulnerability in the affected versions of Outlook Web Access (OWA) for Exchange Server. Exploitation of the vulnerability could lead to elevation of privilege on individual OWA clients connecting to Outlook Web Access for Exchange Server. To exploit the vulnerability an attacker would have to convince a user to open a specially crafted e-mail that would run malicious script from within an individual OWA client. The script would run in the security context of the user’s OWA session and could perform any action the user could perform, such as reading, sending, and deleting e-mail as the logged-on user. To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2008-2248. Update Information Detection and Deployment Tools and Guidance Manage the software and security updates you need to deploy to the servers, desktop, and mobile systems 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 2.1 Microsoft Exchange Server 2003 Service Pack 2 Yes Microsoft Exchange Server 2007 Yes Microsoft Exchange Server 2007 Service Pack 1 Yes For more information about MBSA 2.1, see MBSA 2.1 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, Exchange Server 2007, and SQL Server 2000. 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 with SUSFP SMS 2003 with ITMU SCCM 2007 Microsoft Exchange Server 2003 Service Pack 2 Yes Yes Yes Yes Microsoft Exchange Server 2007 No No Yes Yes Microsoft Exchange Server 2007 Service Pack 1 No No Yes Yes For SMS 2.0 and SMS 2003, the SMS SUS Feature Pack (SUSFP), 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. 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. Update Compatibility Evaluator and Application Compatibility Toolkit Updates often write to the same files and registry settings required for your applications to run. This can trigger incompatibilities and increase the time it takes to deploy security updates. You can streamline testing and validating Windows updates against installed applications with the Update Compatibility Evaluator components included with Application Compatibility Toolkit 5.0. The Application Compatibility Toolkit (ACT) contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Microsoft Windows Vista, a Windows Update, a Microsoft Security Update, or a new version of Windows Internet Explorer in your environment. Top of section Security Update Deployment Affected Software For information about the specific security update for your affected software, click the appropriate link: * Microsoft Exchange Server 2003 (all editions) * Microsoft Exchange Server 2007 (all editions) Other Information Acknowledgments Microsoft thanks the following for working with us to help protect customers: • Michael Jordan of Context Information Security for reporting the OWA Data Validation Cross-Site Scripting Vulnerability (CVE-2008-2247) and the OWA Parsing Cross-Site Scripting Vulnerability (CVE-2008-2248) Top of section 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. Top of section 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. Top of section Revisions • V1.0 (July 8, 2008): Bulletin published. • V1.1 (July 9, 2008): Changed the information reference link for OWA Premium in the Mitigating Factors sections for both vulnerabilities. • V1.2 (July 16, 2008): Added Microsoft Exchange Server 2000 Service Pack 3 as non-affected software. Also provided links to additional information on Outlook Web Access Light and Outlook Web Access Premium in the Mitigating Factors sections. Finally, updated the applicable software under the “Windows Server Update Services” heading in the section, Detection and Deployment Tools and Guidance. [***** End Microsoft Security Bulletin (MS08-039) *****] _______________________________________________________________________________ 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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