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/ _____/ / _ \ ____ ____ _____
\____ \==/ /_\ \ _/ ___\/ _ \ / \
/ \/ | \\ \__( <_> ) Y Y \
/______ /\___|__ / \___ >____/|__|_| /
\/ \/ .-. \/ \/:wq
(x.0)
'=.|w|.='
_='`"``=.
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.
+-----------------------------+
|About Security-Assessment.com|
+-----------------------------+
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