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iDefense Security Advisory 06.10.10: Adobe Flash Player Use-After-Free Vulnerability
From: iDefense Labs <labs-no-reply () idefense com>
Date: Thu, 10 Jun 2010 19:06:49 -0400

iDefense Security
Advisory 06.10.10
http://labs.idefense.com/intelligence/vulnerabilities/
Jun 10, 2010

I. BACKGROUND

Adobe Flash Player is a very popular Web browser plugin. It is available
for multiple Web browsers and platforms, including Windows, Linux and
MacOS. Flash Player enables Web browsers to display rich multimedia
content, such as online videos, and is often a requirement for popular
websites. For more information, see the vendor's site at the following
link.

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

II. DESCRIPTION

Remote exploitation of a use-after-free vulnerability in Adobe Systems
Inc.'s Flash Player could allow an attacker to execute arbitrary code
with the privileges of the current user. <BR> <BR> The
vulnerability
takes place during the processing of a certain image type within a
certain function. The image is positioned at a location on a linked
list. On return from the function, an object is de-allocated and a
stale pointer continues to reference the object. Arbitrary code
execution can occur when the object is used after it has been
de-allocated. Memory that was previously allocated for the object can
be reused by an attacker.

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 Shockwave
Flash file created by an attacker. An attacker typically accomplishes
this via social engineering or injecting content into a compromised,
trusted site.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in the latest
version of Flash Player at the time of testing, version 10.0.22.87.
Adobe Flash Player versions 10.0.45.2 and prior and Adobe AIR
1.5.3.9130 and prior are vulnerable.

V. WORKAROUND

A Internet Explorer plugin is available to temporarily block and unblock
Flash content using a single click. Only trusted sites should be
unblocked when using this plugin. More information is available at
http://flash.melameth.com. <BR> <BR> A Firefox plugin is
available to
temporarily block and unblock Flash content using a single click. Only
trusted sites should be unblocked when using this plugin. More
information is available at: http://flashblock.mozdev.org.

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/apsb10-14.html

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2010-2164 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

12/16/2009  Initial Vendor Notification
12/16/2009  Initial Vendor Reply
06/10/2010  Coordinated Public Disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2010 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice () idefense com for permission.

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.

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