Microsoft Security Bulletin MS09-014 – Critical

This security update resolves four privately reported vulnerabilities and two publicly disclosed vulnerabilities in Internet Explorer. The vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer or if a user connects to an attacker's server by way of the HTTP protocol. 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 Internet Explorer 5.01 and Internet Explorer 6 Service Pack 1, running on supported editions of Microsoft Windows 2000; Internet Explorer 6 and Internet Explorer 7 running on supported editions of Windows XP; and Internet Explorer 7 running on supported editions of Windows Vista. For Internet Explorer 6 and Internet Explorer 7 running on supported editions of Windows Server 2003 and Windows Server 2008, this security update is rated Important. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses these vulnerabilities by modifying the way that Internet Explorer searches the system for files to load, performs authentication reply validation, handles transition errors when navigating between Web pages, and handles memory objects. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection under the next section, Vulnerability Information.

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