iDefense Security Advisory 05.12.09 - Remote exploitation of an integer overflow vulnerability in Microsoft Corp.'s PowerPoint could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability occurs during the parsing of two related PowerPoint record types. The first record type is used to specify collaboration information for different slides. One of the fields in this record contains a 32-bit integer that is used to specify the number of a specific type of records that are present in the file. This integer is used in a multiplication operation that calculates the size of a heap buffer that will be used to store the records as they are read in from the file. The calculation can overflow, resulting in an undersized heap buffer being allocated. By providing a large value for the record count, and inserting enough dummy records, it is possible to trigger a heap based buffer overflow. iDefense has confirmed the existence of these vulnerabilities in PowerPoint 2000 SP3, 2002 XP SP3, 2003 SP2, and 2003 SP3.
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