iDefense Security Advisory 03.09.10 - Remote exploitation of an uninitialized memory vulnerability in Microsoft Corp.'s Excel could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability occurs due to Excel using a local function variable without properly initializing it. This error occurs when parsing several related records inside of an Excel worksheet. When Excel parses certain records in a particular order, a stack variable may not be initialized properly. If an attacker can control the area of memory used for this variable, then it is possible to execute arbitrary code on the targeted host. iDefense has confirmed the existence of this vulnerability in Excel versions 2003 SP3, 2007 SP0, SP1, and SP3 . Previous versions do not appear to be affected. A full list of vulnerable Microsoft products can be found in Microsoft Security Bulletin MS10-017.
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