iDefense Security Advisory 02.09.10 - Remote exploitation of an invalid array indexing vulnerability in Microsoft Corp.'s PowerPoint could allow an attacker to execute arbitrary code with the privileges of the current user. This vulnerability occurs when parsing an "OEPlaceholderAtom" record. This record type is used to create a placeholder for an object (picture, text, etc.) on a slide. By providing a value greater than the size of an array, it is possible to corrupt stack memory beyond the bounds of the array with a fixed value. By overwriting critical structures like the saved return address, it is possible to execute arbitrary code.
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