iDefense Security Advisory 12.07.10 http://labs.idefense.com/intelligence/vulnerabilities/ Dec 07, 2010
I. BACKGROUND QuickTime is Apple's media player product used to render video and other media. The PICT file format was developed by Apple Inc. in 1984. PICT files can contain both object-oriented images and bitmaps. For more information visit http://www.apple.com/quicktime/ II. DESCRIPTION Remote exploitation of a memory corruption vulnerability in Apple Inc.'s QuickTime media player could allow attackers to execute arbitrary code in the context of the targeted user. The vulnerability specifically exists in the way specially crafted PICT image files are handled by the QuickTime PictureViewer. When processing specially crafted PICT image files, Quicktime PictureViewer uses a set value from the file to control the length of a byte swap operation. The byte swap operation is used to convert big endian data to little endian data. QuickTime fails to validate the length value properly before using it. When a length value is larger than the actual buffer size supplied, it will corrupt heap memory beyond the allocated buffer, which could lead to an exploitable condition. III. ANALYSIS Successful exploitation could allow attackers to execute arbitrary code in the context of the current user. To exploit this vulnerability, an attacker must persuade a victim into using QuickTime to open a specially crafted PICT picture file. This could be accomplished by either direct link or referenced from a website under the attacker's control. An attacker could host a Web page containing a malformed PICT file. Upon visiting the malicious Web page exploitation would occur and execution of arbitrary code would be possible. Alternatively a PICT file could be attached within an e-mail file. IV. DETECTION QuickTime Player versions prior to 7.6.9 are vulnerable. V. WORKAROUND iDefense recommends disabling the QuickTime Plugin and altering the .pct, .pic and .pict filetype associations within the registry. Disabling the plugin will prevent Web browsers from utilizing QuickTime Player to view associated media files. Removing the filetype associations within the registry will prevent QuickTime Player and Picture Viewer from opening .pct, .pic and .pict files. VI. VENDOR RESPONSE Apple Inc. has released patches which addresses this issue. For more information, consult their advisory at the following URL: http://support.apple.com/kb/HT4447 VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-3800 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 03/31/2010 Initial Vendor Notification 03/31/2010 Initial Vendor Reply 12/07/2010 Coordinated Public Disclosure IX. CREDIT This vulnerability was reported to iDefense by Hossein Lotfi (s0lute). 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 © 2010 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 customerserv...@idefense.com 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.
