bugtraq - VUPEN Security Research - Google Chrome "Clipboard::WriteData()" Function Sandbox Escape (Pwn2Own)

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Date: Wed, 26 Mar 2014 15:08:40 +0100
From: VUPEN Security Research <advisories@...en.com>
To: bugtraq@...urityfocus.com
Subject: VUPEN Security Research - Google Chrome "Clipboard::WriteData()"
 Function Sandbox Escape (Pwn2Own)

VUPEN Security Research - Google Chrome Clipboard Format Processing
Sandbox Escape (Pwn2Own)

Website : http://www.vupen.com

Twitter : http://twitter.com/vupen

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

"Google Chrome is a freeware web browser developed by Google. Chrome
version 28 and beyond uses the WebKit fork Blink. As of 2013,
StatCounter estimates that Google Chrome has a 39% worldwide usage
share of web browsers" (Wikipedia).

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

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Google Chrome.

The vulnerability is caused by an input validation error within the
"Clipboard::WriteData()" function that does not restrict the value of
the "format" parameter, which could be exploited to escape Chrome's
sandbox and achieve code execution with Medium integrity level.

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

Google Chrome versions prior to 33.0.1750.154

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

Upgrade to Chrome version version 33.0.1750.154.

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
----------------------

http://googlechromereleases.blogspot.com/2014/03/stable-channel-update_14.html

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

2013-12-19 - Vulnerability Discovered by VUPEN Security
2014-03-13 - Vulnerability Reported to Google/ZDI During Pwn2Own 2014
2014-03-14 - Vulnerability Fixed by Google
2014-03-26 - Public disclosure