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Adobe Flash Player ActionScript Array.sortOn() Integer Overflow Vulnerability



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 the following website:


Remote exploitation of an integer buffer overflow vulnerability in Adobe Systems Inc.'s Flash Player could allow an attacker to execute arbitrary code with the privileges of the current user. Adobe Flash Player is an application for viewing animations and movies using computer programs, such as a Web browser; in common use, Flash lets users put animation and movies on a website.

The vulnerability occurs when parsing a maliciously formatted sequence of ActionScript code inside an Adobe Flash file. The problem exists in the ActionScript "Array::sortOn()" method. This function uses an array length to calculate memory allocation length without properly validating the length value. This will result in a heap overflow and leads to an exploitable condition.


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. The attacker can also deliver this exploit through a Microsoft Office document either by embedding a Flash file directly into an Office document or by running JavaScript script to load the Flash file from a website within an Office document. The attacker needs to convince a user to open such an Office document using social engineering methods.


The following versions of Adobe Flash are vulnerable:

  • Adobe Flash Player versions prior to 11.6.602.180 for Windows
  • Adobe Flash Player versions prior to 11.6.602.180 for Macintosh
  • Adobe Flash Player versions prior to for Linux
  • Flash Player versions prior to 11.6.602.180 for Internet Explorer 10 for Windows 8
  • Flash Player versions prior to 11.6.602.180 for Chrome users (Windows, Macintosh and Linux)
  • Adobe AIR versions prior to
  • Adobe Flash Player versions prior to for Android 4.x
  • Adobe Flash Player versions prior to for Android 3.x and 2.x for Windows, Macintosh, Android and SDK & Compiler (includes AIR for iOS)


Disable or uninstall Flash Player, or only allow it to run from trusted websites. This can be performed by changing the permissions on the Flash plug-in binary or by browser plug-in configuration options. This workaround may prevent websites relying on Flash technology from working properly.


Adobe has released a fix which addresses this issue. For more information, consult their advisory at the following URL:


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2013-0646 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


01/03/2013 Initial Vendor Notification
01/03/2013 Initial Vendor Reply
03/12/2013 Coordinated Public Disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2013 Verisign, Inc.

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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.