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Researcher: Microsoft Security Team Dismissive, Adversarial: Page 2 of 4

Some user interaction is required for a successful attack -- socially engineered attacks are now commonplace -- but it wouldn't be tough to trick users, he alleged.

"A malicious user could create content [on a Web site] that would request the user to click an object or press a sequence of keys. By delivering a security prompt during this process, the site could subvert the prompting and obtain permission for actions that were not necessarily authorized."

Murphy first notified Microsoft of the flaw in October 2005, but wasn't contacted by a Microsoft Security Response Center (MSRC) staffer until February 2006. The MSRC dismissed the vulnerability as not serious.

"At that time, I was told that the vulnerability had been classed as a 'Service Pack' fix, meaning that users of Windows 2000 will not receive a fix for this vulnerability," wrote Murphy.

In 2004, Microsoft dumped plans to release a fifth and final service pack, and instead said it would later unveil an "Update Rollup," which it did in mid-2005.