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Adobe Flash Player AVM Verifier Integer Overflow

05.12.11

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 integer overflow vulnerability in Adobe Systems Inc.'s Flash Player ActionScript Virtual Machine (AVM) could allow an attacker to execute arbitrary code with the privileges of the current user.

Part of the ActionScript Virtual Machine verification stage involves parsing an internal structure called 'method_body_info' for a particular method. This structure contains values that dictate the bounds of a stack for a method.

During the construction of a certain object, an integer overflow may occur when performing a calculation using values supplied from the 'method_body_info' structure.

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

DETECTION

The following Adobe products are vulnerable:

  • Adobe Flash Player 10.2.159.1 and earlier versions for Windows, Macintosh, Linux and Solaris operating systems
  • Adobe Flash Player 10.2.154.28 and earlier versions for Chrome users
  • Adobe Flash Player 10.2.157.51 and earlier versions for Android

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/apsb11-12.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-0618 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

12/28/2010 Initial Vendor Notification
12/29/2010 Initial Vendor Reply
05/12/2011 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by binaryproof.

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LEGAL NOTICES

Copyright © 2011 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.