Unspecified vulnerability in Microsoft Windows Media Player 11 allows remote attackers to execute arbitrary code via a crafted audio-only file that is streamed from a Server-Side Playlist (SSPL) on Windows Media Server, aka "Windows Media Player Sampling Rate Vulnerability."

http://www.microsoft.com/technet/security/Bulletin/MS08-054.mspx

Security updates are available from Microsoft Update, Windows Update, and Office Update. Security updates are also available from the Microsoft Download Center. You can find them most easily by doing a keyword search for "security update.

*Windows Server 2008 server core installation not affected. The vulnerability addressed by this update does not affect supported editions of Windows Server 2008 if Windows Server 2008 was installed using the Server Core installation option, even though the files affected by this vulnerability may be present on the system. However, users with the affected files will still be offered this update because the update files are newer (with higher version numbers) than the files that are currently on your system. For more information on this installation option, see Server Core. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008; see Compare Server Core Installation Options.