Public Vulnerability Reports

Adobe Flash Player ActionScript Display Memory Corruption Vulnerability

09.08.11

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/

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.

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.

DETECTION

The following Adobe Products are vulnerable:

  • Adobe Flash Player 10.3.181.36 and earlier versions for Windows, Macintosh, Linux and Solaris operating systems
  • Adobe Flash Player 10.3.185.25 and earlier versions for Android
  • Adobe AIR 2.7 and earlier versions for Windows, Macintosh and Android

WORKAROUND

Disable Flash Player plugin by restricting access to Flash Player files, which is usually under C:WINDOWSsystem32MacromedFlash

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

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.

DISCLOSURE TIMELINE

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

CREDIT

This vulnerability was reported to iDefense by wushi of team509.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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