VUPEN Security Research - Adobe Flash Player ActionScript FileReference 
Buffer Overflow (APSB11-21)

Website : http://www.vupen.com/english/research.php

Twitter : http://twitter.com/vupen


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

"Adobe Flash Player is a cross-platform browser-based application runtime
that delivers uncompromised viewing of expressive applications, content,
and videos across screens and browsers. Flash Player delivers breakthrough
web experiences to over 98% of Internet users." from Adobe.com


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

VUPEN Vulnerability Research Team discovered a critical vulnerability
in Adobe Flash Player.

The vulnerability is caused by a buffer overflow error when processing a
malformed ActionScript FileReference method, which could be exploited by
remote attackers to compromise a vulnerable system by tricking a user
into visiting a specially crafted web page.

CVSS Score: 10 (AV:N/AC:L/Au:N/C:C/I:C/A:C)

CVE: CVE-2011-2137


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

Adobe Flash Player v10.3.181.34 and prior
Adobe Flash Player v10.3.185.25 and prior for Android
Adobe AIR version 2.7 and prior


IV. Binary Analysis & Exploits/PoCs
---------------------------------------

In-depth binary analysis of the vulnerability and a code execution exploit
are available through the VUPEN Binary Analysis & Exploits Service :

http://www.vupen.com/english/services/ba-index.php


VUPEN Binary Analysis & Exploits Service provides private exploits and
in-depth technical analysis of the most significant public vulnerabilities
based on disassembly, reverse engineering, protocol analysis, and code 
audit.

The service allows governments and major corporations to evaluate risks, and
protect infrastructures and assets against new threats. The service also
allows security vendors (IPS, IDS, AntiVirus) to supplement their internal
research efforts and quickly develop both vulnerability-based and
exploit-based signatures to proactively protect their customers from attacks
and emerging threats.


V. VUPEN Threat Protection Program
-----------------------------------

To proactively protect critical networks and infrastructures against 
unpatched
vulnerabilities and reduce risks related to zero-day attacks, VUPEN shares 
its
vulnerability research with governments and organizations members of the 
VUPEN
Threat Protection Program (TPP).

VUPEN TPP customers receive fully detailed and technical reports about 
security
vulnerabilities discovered by VUPEN and in advance of their public 
disclosure.

http://www.vupen.com/english/services/tpp-index.php


VI. SOLUTION
----------------

Upgrade to Adobe Flash Player v10.3.183.5 :
http://www.adobe.com/go/getflash

Upgrade to Adobe Flash Player v10.3.186.3 for Android :
market://details?id=com.adobe.flashplayer

Upgrade to Adobe AIR v2.7.1 :
http://get.adobe.com/air


VII. CREDIT
--------------

This vulnerability was discovered by Nicolas Joly of VUPEN Security


VIII. ABOUT VUPEN Security
---------------------------

VUPEN is the world leader in vulnerability research for defensive and
offensive security. VUPEN solutions enable corporations and governments to
measure and manage risks, eliminate vulnerabilities before they can be
exploited, and protect critical infrastructures and assets against
known and unknown vulnerabilities.

VUPEN has been recently recognized as "Entrepreneurial Company of the Year
in the Vulnerability Research Market (2011)" by Frost & Sullivan.

VUPEN solutions include:

* VUPEN Binary Analysis & Exploits Service (BAE) :
http://www.vupen.com/english/services/ba-index.php

* VUPEN Threat Protection Program (TPP) :
http://www.vupen.com/english/services/tpp-index.php


IX. REFERENCES
----------------------

http://www.adobe.com/support/security/bulletins/apsb11-21.html
http://www.vupen.com/english/research.php


X. DISCLOSURE TIMELINE
-----------------------------

2011-04-28 - Vulnerability Discovered by VUPEN and shared with customers
2011-08-10 - Public disclosure