Adobe Shockwave 3D Asset DEMX Integer Overflow Vulnerability
06.14.11
BACKGROUND

Adobe Shockwave Player is a popular Web browser plug-in. It is available for multiple Web browsers and platforms, including Windows, and MacOS. Shockwave Player enables Web browsers to display rich multimedia content in the form of Shockwave videos. For more information, see the vendor's site found at the following link:

http://get.adobe.com/shockwave
DESCRIPTION

Remote exploitation of an integer overflow vulnerability in Adobe Systems Inc.'s Shockwave could allow an attacker to execute arbitrary code with the privileges of the current user.

This vulnerability occurs when Shockwave processes a maliciously constructed "DEMX" chunk. This occurs when parsing a certain subrecord located inside the DEMX chunk. Specifically, a 32-bit value from the file is used in an arithmetic operation that calculates the number of bytes to allocate for a heap buffer. This calculation can overflow, which leads to an undersized buffer allocation. Subsequently, this buffer is overflowed with data from the file. This can lead to the execution of arbitrary code.
ANALYSIS

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 created by an attacker. 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.
DETECTION

Shockwave Player version 11.5.9.620 and prior are vulnerable.
WORKAROUND

iDefense is currently unaware of any workarounds for this issue.
VENDOR RESPONSE

Adobe has addressed this issue with an update. Further details and patches can be found at the following URL.

http://www.adobe.com/support/security/bulletins/apsb11-17.html
CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-2123 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.
DISCLOSURE TIMELINE

05/11/2011 Initial Vendor Notification
05/11/2011 Initial Vendor Reply
06/14/2011 Coordinated Public Disclosure
CREDIT

This vulnerability was reported to iDefense by Luigi Auriemma.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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