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Adobe Flash Player Use-After-Free 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 a use-after-free 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 takes place during the processing of a certain image type within a certain function. The image is positioned at a location on a linked list. On return from the function, an object is de-allocated and a stale pointer continues to reference the object. Arbitrary code execution can occur when the object is used after it has been de-allocated. Memory that was previously allocated for the object can be reused by an attacker.


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.


iDefense has confirmed the existence of this vulnerability in the latest version of Flash Player at the time of testing, version Adobe Flash Player versions and prior and Adobe AIR and prior are vulnerable.


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

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:


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-2010-2164 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


12/16/2009 Initial Vendor Notification
12/16/2009 Initial Vendor Reply
06/10/2010 Coordinated Public Disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2010 Verisign, Inc.

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