Apple QuickTime SMIL File Processing Integer Overflow Vulnerability iDefense Security Advisory 07.11.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jul 11, 2007 I. BACKGROUND QuickTime is Apple's media player product used to render video and other media. For more information visit http://www.apple.com/quicktime/ The Synchronized Multimedia Integration Language (SMIL) provides a high-level scripting syntax for describing multimedia presentations. SMIL files are text files that use XML-based syntax to specify what media elements to present, and where and when to present them. II. DESCRIPTION Remote exploitation of an integer overflow vulnerability in Apple Computer Inc.'s QuickTime media player could allow attackers to execute arbitrary code in the context of the targeted user. The vulnerability specifically exists in QuickTime players handling of the title and author fields in an SMIL file. When parsing an SMIL file, arithmetic calculations can cause insufficient memory to be allocated. When copying in user-supplied data from the SMIL file, a heap-based buffer overflow occurs. This results in a potentially exploitable condition. III. ANALYSIS Exploitation could allow attackers to execute arbitrary code in the context of the current user. In order to exploit this vulnerability, an attacker must persuade a user into using QuickTime to open a specially crafted SMIL file. This could be accomplished using a malicious SMIL file referenced from a website under the attacker's control. IV. DETECTION iDefense Labs confirmed this vulnerability exists in version 7.1.3 and 7.1.5 of QuickTime on Windows and Mac OS X. Previous versions are suspected to be vulnerable. V. WORKAROUND iDefense is currently unaware of any effective workarounds for this vulnerability. VI. VENDOR RESPONSE Apple has released QuickTime 7.2 which resolves this issue. More information is available via Apple's QuickTime Security Update page at the URL shown below. http://docs.info.apple.com/article.html?artnum=305947 VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-2394 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 04/02/2007 Initial vendor notification 04/09/2007 Initial vendor response 07/11/2007 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by David Vaartjes from ITsec Security Services http://www.itsec-ss.nl/. Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2007 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.
