Microsoft Security Bulletin MS05-013
Vulnerability in the DHTML Editing Component ActiveX Control Could Allow Remote Code Execution (891781)

Issued: February 8, 2005
Version: 1.0

Who should read this document: Customers who use Microsoft Windows

Impact of Vulnerability: Remote Code Execution

Maximum Severity Rating: Critical

Recommendation: Customers should apply the update immediately.

Security Update Replacement: None

Caveats: Microsoft Knowledge Base Article 891781 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 891781.

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 XP Service Pack 1 and Microsoft Windows XP Service Pack 2 ? Download the update
?Microsoft Windows XP 64-Bit Edition Service Pack 1 (Itanium) ? Download the update
?Microsoft Windows XP 64-Bit Edition Version 2003 (Itanium) ? Download the update
?Microsoft Windows Server 2003 ? Download the update
?Microsoft Windows Server 2003 for Itanium-based Systems ? 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.

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.

Executive Summary:

This update resolves a newly-discovered, public vulnerability. A vulnerability exists in the DHTML Editing Component ActiveX Control. This vulnerability could allow information disclosure or remote code execution on an affected system. 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.

We recommend that customers apply the update immediately.