Microsoft Security Bulletin: Alert - Critical Product Vulnerability

Microsoft has recently released a new out-of-band security bulletin MS08-067 (Vulnerability in Server Service Could Allow Remote Code Execution - 958644) to address a vulnerability in all supported versions of Windows.
This security update resolves a privately reported vulnerability in the Server service. The vulnerability could allow remote code execution if an affected system received a specially crafted RPC request. On Microsoft Windows 2000, Windows XP, and Windows Server 2003 systems, an attacker could exploit this vulnerability without authentication to run arbitrary code. It is possible that this vulnerability could be used in the crafting of a wormable exploit. Firewall best practices and standard default firewall configurations can help protect network resources from attacks that originate outside the network perimeter.
This security update is rated Critical for all supported editions of Microsoft Windows 2000, Windows XP, Windows Server 2003, and rated Important for all supported editions of Windows Vista and Windows Server 2008. For more information, see the bulletin link below.
This security update was released outside of the usual monthly security bulletin release cycle in an effort to protect customers. Microsoft recommends customers prepare their systems and networks to apply this security bulletin immediately once released to help ensure that their computers are protected from attempted criminal attacks. For more information about security updates, visit http://www.microsoft.com/protect
Further info
You can find full details of the vulnerability, any updates to this advisory, and information on how to obtain the update here or watch our on-demand webcast.