iDefense Security Advisory 06.08.09 - Remote exploitation of a memory corruption vulnerability in multiple vendors' WebKit browser engine could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability occurs when JavaScript code is used to set a certain property of an HTML tag within a web page. When JavaScript code sets this property, child elements of the tag are freed. However, when an error in the remaining HTML is encountered, these previously freed tag values are referenced. The freed memory is then treated as a C++ object, which can lead to attacker controlled values being used as function pointers. iDefense has confirmed the existence of this vulnerability in WebKit-r42162. Previous versions may also be affected.
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