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Adobe Flash Player ActionScript Integer Overflow Vulnerability



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.


Remote exploitation of an integer overflow 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 ActionScript method of a built-in class. A certain function accepts an array object as a first parameter and uses this array's length multiplied by three for a memory allocation without any overflow checks. Then it writes the array's content into the allocated memory, which corrupts memory 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 attackers 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 following Adobe products are vulnerable:

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


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


Adobe has released a fix which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-0628 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


04/27/2011 Initial Vendor Notification
04/27/2011 Vendor Reply
05/24/2011 Coordinated Public Disclosure


This vulnerability was reported to iDefense by Vitaliy Toropov.

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Copyright © 2011 Verisign, Inc.

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