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Time to update your Windows XP, Windows 2003 Server and older Windows versions – Here is the Security bullitin from Microsoft:

Microsoft Security Advisory (971778)
Vulnerability in Microsoft DirectShow Could Allow Remote Code Execution
Published: May 28, 2009


Version: 1.0

Microsoft is investigating new public reports of a new vulnerability in Microsoft DirectX. The vulnerability could allow remote code execution if user opened a specially crafted QuickTime media file. Microsoft is aware of limited, active attacks that use this exploit code. While our investigation is ongoing, our investigation so far has shown that Windows 2000 Service Pack 4, Windows XP, and Windows Server 2003 are vulnerable; all versions of Windows Vista and Windows Server 2008 are not vulnerable. Microsoft has activated its Software Security Incident Response Process (SSIRP) and is continuing to investigate this issue.
Upon completion of this investigation, Microsoft will take the appropriate action to help protect our customers. This may include providing a security update through our monthly release process or providing an out-of-cycle security update, depending on customer needs.

We are actively working with partners in our Microsoft Active Protections Program (MAPP) and our Microsoft Security Response Alliance (MSRA) program to provide information that they can use to provide broader protections to customers.
Mitigating Factors:

In a Web-based attack scenario, an attacker would have to host a Web site that contains a Web page that is used to exploit this vulnerability. An attacker would have no way to force users to visit a malicious Web site. Instead, an attacker would have to convince them to visit the Web site, typically by getting them to click a link that takes them to the attacker’s Web site. After they click the link, they would be prompted to perform several actions. An attack could only occur after they performed these actions.

An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. 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.

All versions of Windows Vista and Windows Server 2008 are not affected by this issue.

Link to fix issue:
http://support.microsoft.com/kb/971778

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