iDefense Security Advisory 04.14.09 - Remote exploitation of a stack buffer overflow vulnerability in Microsoft Corp.'s WordPad could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability occurs when parsing the content of a Word97 format file. When reading in the data, the code uses a 32-bit integer from the file to check a buffer length while using the lower 16-bit value to do the actual copy. This results in a stack buffer overflow. This stack buffer is overwritten with data from the file. iDefense has confirmed the existence of this vulnerability in Wordpad on Windows 2000 SP4. Windows XP SP3 is not affected. Vista and Server 2008 are not affected as they no longer contain the Word97 converter.
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