Public Vulnerability Reports

Adobe Flash Player Invalid Loader Object Reference 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 found at the following link.


Remote exploitation of an invalid Loader object reference vulnerability in Adobe Systems Inc.'s Flash Player could allow an attacker to execute arbitrary code with the privileges of the current user.

During the processing of a Shockwave Flash file, an object can be created, along with multiple references that point to the object. The object can be destroyed and its associated references removed. However a reference can incorrectly remain pointing to the object. The invalid object resides in uninitialized memory, which the attacker may control to gain arbitrary execution control.


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 Shockware 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 latest Flash Player version Previous versions may also be affected.


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 patch 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-2009-1864 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


08/25/2008 - Initial Contact
09/22/2008 - Second Contact attempt
09/22/2008 - PoC Requested
09/24/2008 - PoC Requested
11/05/2008 - PoC Sent
11/06/2008 - Clarification requested
11/21/2008 - Clarification requested
12/05/2008 - Clarification Sent
12/05/2008 - Clarification requested
12/07/2008 - Additional Clarification Sent
02/24/2009 - Status update received - no estimated release date
04/05/2009 - Clarification requested
05/05/2009 - Clarification sent
05/06/2009 - Clarification requested
05/06/2009 - Clarification sent
05/11/2009 - Tentative disclosure set to August
07/30/2009 - Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2009 Verisign, Inc.

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