Cerulean Studios Trillian UTF-8 Word Wrap Heap Overflow Vulnerability iDefense Security Advisory 06.18.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jun 18, 2007 I. BACKGROUND Trillian is a multi-protocol chat application that supports IRC, ICQ, AIM and MSN protocols. More information can be found on the vendor's site at the following URL. http://www.ceruleanstudios.com/learn II. DESCRIPTION Remote exploitation of a heap overflow vulnerability in Cerulean Studios Trillian Instant Messenger could allow attackers to execute arbitrary code as the currently logged on user. The vulnerability specifically exists due to improper handling of UTF-8 sequences. When word-wrapping UTF-8 text, the window width is improperly used as a buffer size value. As such, heap corruption can occur leading to a potentially exploitable condition. III. ANALYSIS Exploitation of this vulnerability could allow remote attackers to execute arbitrary code with the credentials of the currently logged on user. Exploitation occurs simply by viewing a malicious message that contains a specially constructed UTF-8 string. The MSN protocol is a known attack vector for this vulnerability. However, exploitation could potentially occur using any supported protocol. IV. DETECTION iDefense has confirmed the existence of this vulnerability in Cerulean Studios Trillian 3.1.5.1. Previous versions are suspected to be vulnerable. V. WORKAROUND iDefense is currently unaware of any effective workaround for this issue. VI. VENDOR RESPONSE The Cerulean Studios team has addressed this vulnerability by releasing version 3.1.6.0 of Trillian. More information is available at the Cerulean Studios Blog via the following URL. http://blog.ceruleanstudios.com/?p=150 VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 05/04/2007 Initial vendor notification 05/04/2007 Initial vendor response 06/18/2007 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by www.BlurredLogic.com. 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.
