iDefense Security Advisory 06.09.09 - Remote exploitation of an integer overflow vulnerability in multiple versions of Adobe Systems Inc's Reader and Acrobat PDF reader and processor could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability occurs when parsing a FlateDecode filter inside a PDF file. FlateDecode is a filter for data compressed with zlib deflate compression method. Several parameters can be specified for the FlateDecode filter. Those values are used in an arithmetic operation that calculates the number of bytes to allocate for a heap buffer. This calculation can overflow, which results in an undersized heap buffer being allocated. This buffer is then overflowed with data decompressed from the FlateDecode stream. This leads to a heap-based buffer overflow that can result in arbitrary code execution. Acrobat Reader and Acrobat Professional versions 7.1.0, 8.1.3, 9.0.0 and prior versions are vulnerable.
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