The flaw is due to a buffer overflow error that can occur when Windows Media Player is used to run ".asx" media files, according to a warning from eEye Digital Security.

Such files open automatically in a Web browser, meaning a hacker would need only to post an infected .asx file in a Web page and then try to lure users to visit the page, eEye Digital said. An infected file could also be sent via email, in which case users would need to be persuaded to open it.

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