Description: This security update resolves several vulnerabilities in Microsoft XML Core Services. The most severe vulnerability could allow remote code execution if a user viewed a specially crafted Web page using Internet Explorer. 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. This security update is rated Critical for Microsoft XML Core Services 3.0 and Important for Microsoft XML Core Services 4.0, Microsoft XML Core Services 5.0, and Microsoft XML Core Services 6.0. The security update addresses the vulnerabilities by modifying the way that Microsoft XML Core Services parses XML content, handles external document type definitions (DTD), and sets HTTP request fields.

Update type: Critical

Release date: November 13, 2008

Applies to: All

Knowledge base: http://support.microsoft.com/kb/954459

Download link: 32-bit | 64-bit

Comments: Here are the specifics on the vulnerabilities covered by this update:

• MSXML Memory Corruption Vulnerability – CVE-2007-0099
• MSXML DTD Cross-Domain Scripting Vulnerability – CVE-2008-4029
• MSXML Header Request Vulnerability – CVE-2008-4033