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Adobe Flash Player Out of Bounds Memory Indexing Vulnerability

06.10.10

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/

DESCRIPTION

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

During the processing of certain types of Adobe Flash code, a certain function may be tricked into accepting an overly large index argument. The index argument may reference a memory location outside the bounds of memory allocated for an array object. Arbitrary code execution can occur when an index is calculated to point to a sensitive memory location, and the memory location is overwritten with specially crafted values.

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.

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.

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.

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.

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

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-2161 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

08/06/2009 Initial Vendor Notification
08/06/2009 Initial Vendor Reply
06/10/2010 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Vitaliy Toropov.

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LEGAL NOTICES

Copyright © 2010 Verisign, 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 customer service 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.