Avoid untrusted PowerPoint docs, says Microsoft

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Microsoft advised PowerPoint users this week to avoid Office files from untrusted sources - and unexpected files from trusted sources - as a workaround for the recently discovered flaw in PowerPoint now being exploited in targeted attacks.

Microsoft researchers ware finalizing an update that could be released as part of the Aug. 8 Patch Tuesday, according to a new security advisory released this week.

The Redmond, Wash., company was investigating new reports of limited zero-day attacks using the flaw, according to a company spokesman.

On Monday, Stephen Toulouse, security program manager, said the company's researchers were working "on a state of high alert" since targeted attacks on Office flaws began appearing in recent months.

The PowerPoint exploit, like an exploit for Excel used a month before, was first seen in the days following Patch Tuesday, when Microsoft released seven new fixes for security flaws in its products.

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