Microsoft Security Bulletin MS05-021 - Critical
Vulnerability in Exchange Server Could Allow Remote Code Execution (894549)
Published: | Updated:
Who should read this document: Customers who use Microsoft Exchange Server
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: The security update for Exchange 2000 Server Service Pack 3 requires, as a prerequisite, the Exchange 2000 Server Post-Service Pack 3 (SP3) Update Rollup. You must install the Update Rollup for Exchange 2000 (KB870540) before you install the security update that is provided in this security bulletin. This security update will detect whether the Update Rollup is installed. If the Update Rollup is not installed, you will be directed to the download Web site. For more information, see Microsoft Knowledge Base Article 870540. To download the prerequisite update, visit this Web site.
Tested Software and Security Update Download Locations:
- Microsoft Exchange 2000 Server Service Pack 3 - Download the update
- Microsoft Exchange Server 2003 – Download the update
- Microsoft Exchange Server 2003 Service Pack 1 – Download the update
- Microsoft Exchange Server 5.5 Service Pack 4
- Microsoft Exchange Server 5.0 Service Pack 2
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.
Microsoft thanks the following for working with us to help protect customers:
- Mark Dowd and Ben Layer of ISS X-Force for reporting the Exchange Server Vulnerability (CAN-2005-0560).
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 Windows Update Web site.
- 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.
- 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 by using 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 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 Analyze, 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.
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.
- V1.0 (April 12, 2005): Bulletin published
- V1.1 (April 14, 2005): Bulletin updated to point to the correct Exchange 2000 Server Post-Service Pack 3 (SP3) Update Rollup and to advise on the scope and caveats of workaround “Unregister xlsasink.dll and fallback to Active Directory for distribution of route information”.