__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Vulnerability in Microsoft Exchange [Microsoft Security Bulletin MS06-019 (916803)] May 9, 2006 19:00 GMT Number Q-194 [REVISED 05 May 2006] [REVISED 15 May 2006] ______________________________________________________________________________ PROBLEM: A remote code execution vulnerability exists in Microsoft Exchange Server that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system. PLATFORM: Affected Software: • Microsoft Exchange Server 2000 with the Exchange 2000 Post- Service Pack 3 Update Rollup of August 2004(870540) • Microsoft Exchange Server 2003 Service Pack 1 • Microsoft Exchange Server 2003 Service Pack 2 DAMAGE: An attacker could exploit the vulnerability by constructing a specially crafted message that could potentially allow remote code execution when an Exchange Server processes an email with certain vCal or iCal properties. SOLUTION: Apply the update immediately. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. A remote code execution vulnerability exists ASSESSMENT: in Microsoft Exchange Server that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/q-194.shtml ORIGINAL BULLETIN: Microsoft Security Bulletin MS06-019 (916803) http://www.microsoft.com/technet/security/Bulletin/MS06- 019.mspx CVE: http://www.cve.mitre.org/cgi-bin/cvename.cgi?name= CVE-2006-0027 ______________________________________________________________________________ REVISED HISTORY: 15 May 2006 - Revised Q-194 to update Microsoft's FAQ section for additional fixes in the Knowledge Base Article 912918. [***** Start Microsoft Security Bulletin MS06-019 (916803) *****] Microsoft Security Bulletin MS06-019 Vulnerability in Microsoft Exchange Could Allow Remote Code Execution (916803) Published: May 9, 2006 Version: 1.1 Summary Who should read this document: System administrators who use Microsoft Exchange Impact of Vulnerability: Remote Code Execution Maximum Severity Rating: Critical Recommendation: Customers should apply the update immediately. Security Update Replacement: This bulletin replaces a prior security update. See the frequently asked questions (FAQ) section of this bulletin for the complete list. Caveats: Microsoft Knowledge Base Article 916803 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 916803. Tested Software and Security Update Download Locations: Affected Software: • Microsoft Exchange Server 2000 with the Exchange 2000 Post-Service Pack 3 Update Rollup of August 2004(870540) - Download the update • Microsoft Exchange Server 2003 Service Pack 1– Download the update • Microsoft Exchange Server 2003 Service Pack 2 –Download the update 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. For more information about Exchange 2000 Server Post-Service Pack 3 Update Rollup see Microsoft Knowledge Base Article 870540. Top 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. We recommend that customers apply the update immediately Severity Ratings and Vulnerability Identifiers: Vulnerability Identifiers Impact of Vulnerability Exchange 2000 Server Exchange Server 2003 Service Pack 1 Exchange Server 2003 Service Pack 2 Exchange Calendar Vulnerability - CVE-2006-0027 Remote Code Execution Critical Critical Critical 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. Vulnerability Details * Exchange Calendar Vulnerability - CVE-2006-0027: A remote code execution vulnerability exists in Microsoft Exchange Server that could allow an attacker who successfully exploited this vulnerability to take complete control of the affected system. An attacker could exploit the vulnerability by constructing a specially crafted message that could potentially allow remote code execution when an Exchange Server processes an email with certain vCal or iCal properties. * Mitigating Factors for Exchange Calendar Vulnerability - CVE-2006-0027: * Workarounds for Exchange Calendar Vulnerability - CVE-2006-0027: * FAQ for Exchange Calendar Vulnerability - CVE-2006-0027: Security Update Information Affected Software: For information about the specific security update for your affected software, click the appropriate link: * Exchange Server 2003 Service Pack 2 * Exchange Server 2003 Service Pack 1 * Exchange 2000 Server Service Pack 3 Obtaining Other Security Updates: Updates for other security issues are available at the following locations: • Security updates are available in 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 (May 9, 2006): Bulletin published. • V1.1 (May 11, 2006): Updated the Frequently Asked Questions section to provide clarification around the additional fixes talked about in Microsoft Knowledge Base Article 912918. [***** End Microsoft Security Bulletin MS06-019 (916803) *****] _______________________________________________________________________________ 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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