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iDefense Security Advisory 10.13.09: Adobe Acrobat and Reader Firefox Plugin Use After Free Vulnerability
iDefense Security Advisory 10.13.09
Oct 13, 2009
Adobe Acrobat Reader/Acrobat are programs for viewing and editing
Portable Document Format (PDF) documents. For more information, see the
vendor's site found at the following link.
Remote exploitation of a use after free vulnerability in Adobe Systems
Inc.'s Acrobat and Reader Firefox plugin could allow an attacker to
execute arbitrary code with the privileges of the current user.
When Adobe Acrobat/Reader is installed, it also installs various browser
plugins that allow PDF documents to be viewed in the browser. This
vulnerability occurs within the Firefox browser plugin. The Internet
Explorer version is not affected.
The vulnerability occurs when Firefox attempts to navigate away from a
page and unload the PDF viewing plugin. When Firefox calls the plugin's
destroy method, the plugin does not properly free its resources.
Specifically, a function pointer for the window update routine is not
properly freed. This results in uninitialized memory being used when
the window is redrawn, which leads to attacker supplied data being
executed when the function pointer is dereferenced.
Exploitation of this vulnerability results in the execution of arbitrary
code with the privileges of the user viewing the web page. In order to
exploit this vulnerability, the plugin must be enabled, and the
"Display PDF in browser" option must be checked. Both of these are
iDefense has confirmed the existence of this vulnerability in Acrobat
and Reader versions 8.1.3, 8.1.4, 8.1.5, and 8.1.6. Previous versions
are also likely affected. Version 9.1.3 and previous 9.x versions are
Disabling the Adobe Firefox plugin will prevent the exploitation of this
vulnerability. However, it will also prevent a user from viewing PDFs
within the browser.
increase the difficulty of successfully exploiting this vulnerability,
but it will not prevent it from triggering.
VI. VENDOR RESPONSE
Adobe has addressed this issue with an update. Further details and
patches can be found at the following URL.
VII. CVE INFORMATION
The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2009-2991 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
VIII. DISCLOSURE TIMELINE
06/22/2009 Initial vendor notification
06/22/2009 Initial vendor response
10/13/2009 Coordinated Public disclosure
This vulnerability was reported to iDefense by Elazar Broad.
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X. LEGAL NOTICES
Copyright © 2009 iDefense, Inc.
Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@xxxxxxxxxxxx for permission.
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.