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OSVDB: OSVDB-97094

MS13-069 Microsoft Internet Explorer CCaret Use-After-Free
Posted Sep 20, 2013
Authored by corelanc0d3r, sinn3r | Site metasploit.com

This Metasploit module exploits a use-after-free vulnerability found in Internet Explorer, specifically in how the browser handles the caret (text cursor) object. In IE's standards mode, the caret handling's vulnerable state can be triggered by first setting up an editable page with an input field, and then we can force the caret to update in an onbeforeeditfocus event by setting the body's innerHTML property. In this event handler, mshtml!CCaret::`vftable' can be freed using a document.write() function, however, mshtml!CCaret::UpdateScreenCaret remains unaware of this change, and still uses the same reference to the CCaret object. When the function tries to use this invalid reference to call a virtual function at offset 0x2c, it finally results a crash. Precise control of the freed object allows arbitrary code execution under the context of the user.

tags | exploit, arbitrary, code execution
advisories | CVE-2013-3205, OSVDB-97094
MD5 | b222591cf314e782b7770e70d0c3f3a6
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