iDefense Security Advisory 08.09.11
http://labs.idefense.com/intelligence/vulnerabilities/
Aug 09, 2011

I. BACKGROUND

Adobe Flash Player is an application for viewing animations and movies
using computer programs such as a Web browser; in common usage, Flash
lets you put animation and movies on a website. Flash Player runs SWF
files that can be created by the Adobe Flash authoring tool, by Adobe
Flex, or by a number of other Macromedia and third-party tools. For more
information, please visit following website:

http://www.adobe.com/products/flashplayer/

II. DESCRIPTION

Remote exploitation of a memory corruption vulnerability in Adobe
Systems Inc.'s Flash Player could allow an attacker to execute arbitrary
code with the privileges of the current user.

The vulnerability occurs when parsing a maliciously formatted sequence
of ActionScript code inside an Adobe Flash file. The problem exists in a
certain ActionScript function method of the built-in "flash.display"
class. When malformed parameters are supplied to this function, a memory
corruption will occur, leading to an exploitable condition.

III. ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the user viewing the Web page. To exploit
this vulnerability, a targeted user must load a malicious Web page that
an attacker creates. An attacker typically accomplishes this via social
engineering or injecting content into compromised, trusted sites. After
the user visits the malicious Web page, no further user interaction is
needed.

IV. DETECTION

The following Adobe Products are vulnerable: <ul> <li> Adobe Flash
Player 10.3.181.36 and earlier versions for Windows, Macintosh, Linux
and Solaris operating systems </li> <li> Adobe Flash Player 10.3.185.25
and earlier versions for Android </li> <li> Adobe AIR 2.7 and earlier
versions for Windows, Macintosh and Android </li> </ul>

V. WORKAROUND

Disable Flash Player plugin by restricting access to Flash Player files,
which is usually under C:\WINDOWS\system32\Macromed\Flash\

VI. VENDOR RESPONSE

Adobe has released a fix which addresses this issue. Information about
downloadable vendor updates can be found by clicking on the URLs shown.

http://www.adobe.com/support/security/bulletins/apsb11-21.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2011-2135 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

06/29/2011  Initial Vendor Notification
06/29/2011  Vendor Reply
08/09/2011  Coordinated Public Disclosure

IX. CREDIT

This vulnerability was reported to iDefense by wushi of team509.

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X. LEGAL NOTICES

Copyright © 2011 Verisign

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Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
 There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on,
this information.