[Full-disclosure] Microsoft Internet Explorer textNode Use-After-Free

[Scott Bell <scott.bell@xxxxxxxxxxxxxxxxxxxxxxx>]

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        presents..


Microsoft Internet Explorer textNode Use-After-Free

PDF: 
http://security-assessment.com/files/documents/advisory/ms13_037_ie_textnode_uaf.pdf
Metasploit: 
http://www.security-assessment.com/files/documents/advisory/ms13_037_ie_textnode_uaf.rb

+-----------+
|Description|
+-----------+

A Use-after-free memory corruption vulnerability was identified in Microsoft 
Internet Explorer 8. This allows a malicious user to remotely execute arbitrary 
code on a vulnerable user’s machine, in the context of the current user. The 
memory corruption happens when the application of a style sheet performs style 
computations on the DOM. A DOM textNode pointer becomes corrupted after the 
style computation. This pointer is then overwritten when the innerHTML property 
on the parent object is set.


+------------+
|Exploitation|
+------------+

Exploitation of this vulnerability requires a user to visit a page containing 
specially crafted JavaScript. Users can generally be lured to visit web pages 
via email, instant message or links on the internet. Vulnerabilities like this 
are often hosted on legitimate websites which have been compromised by other 
means. Exploitation of this vulnerability is relatively simple. Under correct 
conditions, setting the innerHTML of the object results in an attacker 
controlled direct pointer overwrite. The only obstacle is having to perform 
heap manipulation before a ROP chain can be used.


+--------+
|Solution|
+--------+

Microsoft validated this security issue in Internet Explorer 8 and issued a 
patch (MS13-037) to remedy it. Security-Assessment.com recommends applying the 
patch which has been made available via Windows Update.


+-----------------------------+
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+-----------------------------+

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