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CVE-2013-3184

Status Candidate

Overview

Microsoft Internet Explorer 7 through 10 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."

Related Files

MS13-059 Microsoft Internet Explorer CFlatMarkupPointer Use-After-Free
Posted Sep 4, 2013
Authored by corelanc0d3r, sinn3r | Site metasploit.com

This is a memory corruption bug found in Microsoft Internet Explorer. On IE 9, it seems to only affect certain releases of mshtml.dll. For example: This Metasploit module can be used against version 9.0.8112.16446, but not for 9.0.8112.16421. IE 8 requires a different way to trigger the vulnerability, but not currently covered by this module. The issue is specific to the browser's IE7 document compatibility, which can be defined in X-UA-Compatible, and the content editable mode must be enabled. An "onmove" event handler is also necessary to be able to trigger the bug, and the event will be run twice before the crash. The first time is due to the position change of the body element, which is also when a MSHTML!CFlatMarkupPointer::`vftable' object is created during a "SelectAll" command, and this object will be used later on for the crash. The second onmove event seems to be triggered by a InsertButton (or Insert-whatever) command, which is also responsible for the free of object CFlatMarkupPointer during page rendering. The EnsureRecalcNotify() function will then still return an invalid reference to CFlatMarkupPointer (stored in EBX), and then passes this on to the next functions (GetLineInfo -> QIClassID). When this reference arrives in function QIClassID, an access violation finally occurs when the function is trying to call QueryInterface() with the bad reference, and this results a crash. Successful control of the freed memory may leverage arbitrary code execution under the context of the user. Note: It is also possible to see a different object being freed and used, doesn't always have to be CFlatMarkupPointer.

tags | exploit, arbitrary, code execution
advisories | CVE-2013-3184, OSVDB-96182
SHA-256 | c9fced33ed8b3ca4912bdf0536174294180b31d03023d16a997c87ccf960f2fd
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