BugTraq
VUPEN Security Research - Microsoft Internet Explorer CSS @import Memory Corruption (Pwn2Own 2014) Jul 16 2014 09:52AM
VUPEN Security Research (advisories vupen com)
VUPEN Security Research - Microsoft Internet Explorer CSS @import Memory
Corruption (Pwn2Own 2014)

Website : http://www.vupen.com

Twitter : http://twitter.com/vupen

I. BACKGROUND
---------------------

"Microsoft Internet Explorer is a web browser developed by Microsoft and
included as part of the Microsoft Windows line of operating systems with
more than 60% of the worldwide usage share of web browsers." (Wikipedia)

II. DESCRIPTION
---------------------

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Microsoft Internet Explorer.

The vulnerability is caused by a use-after-free vulnerability when
manipulating CSS @import statements through "addImport()" or
"removeImport()", which could be exploited by attackers to leak
arbitrary memory or execute arbitrary code via a malicious web page.

III. AFFECTED PRODUCTS
---------------------------

Microsoft Internet Explorer 11
Microsoft Internet Explorer 10
Microsoft Internet Explorer 9

IV. SOLUTION
----------------

Apply MS14-037 security update.

V. CREDIT
--------------

This vulnerability was discovered by VUPEN Security.

VI. ABOUT VUPEN Security
---------------------------

VUPEN is the leading provider of defensive and offensive cyber security
intelligence and advanced zero-day research. All VUPEN's vulnerability
intelligence results exclusively from its internal and in-house R&D
efforts conducted by its team of world-class researchers.

VUPEN Solutions: http://www.vupen.com/english/services/

VII. REFERENCES
----------------------

https://technet.microsoft.com/library/security/ms14-037
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1763

VIII. DISCLOSURE TIMELINE
-----------------------------

2014-01-24 - Vulnerability Discovered by VUPEN Security
2014-03-14 - Vulnerability Reported to ZDI / Microsoft During Pwn2Own 2014
2014-07-08 - Vulnerability Fixed by Microsoft
2014-07-16 - Public disclosure

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