Description: 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. 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.

Update type: Critical

Release date: April 14, 2009

Applies to: All versions

Knowledge base: support.microsoft.com/kb/963027

Download link: 32-bit | 64-bit
Comments:There are different downloads if you are running the beta of SP2.

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

• Blended Threat Remote Code Execution Vulnerability – CVE-2008-2540
• WinINet Credential Reflection Vulnerability – CVE-2009-0550
• Page Transition Memory Corruption Vulnerability – CVE-2009-0551
• Uninitialized Memory Corruption Vulnerability – CVE-2009-0552
• Uninitialized Memory Corruption Vulnerability – CVE-2009-0553
• Uninitialized Memory Corruption Vulnerability – CVE-2009-0554