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Security Services

Apple QuickTime ActiveX Control Use-after-Free Vulnerability



QuickTime is a video playing and editing suite for Mac OS X and Windows.


Remote exploitation of a use-after-free vulnerability in Apple Inc.'s QuickTime could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability occurs when QuickTime incorrectly frees an object when handling a specific method of the QuickTime ActiveX control in a Web page. When this method is invoked, an object is freed but a stale reference to the freed object is still kept and can be accessed later. This can result in arbitrary code execution when the reference is used to access a function pointer.


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.

To exploit this vulnerability, it is necessary to reallocate a block of freed memory with attacker-controlled data. This is possible and can be performed reliably.


QuickTime versions prior to 7.7.3 are vulnerable.


Exploitation can be prevented by disabling the QuickTime plug-in.


Apple Inc. has released an update which addresses this issue. For more information, consult their advisory at the following URL:


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2012-3754 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


07/25/2012 Initial Vendor Notification
07/25/2012 Initial Vendor Reply
11/07/2012 Coordinated Public Disclosure


This vulnerability was reported to iDefense by CHkr_d591.

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Copyright © 2012 Verisign, Inc.

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