Public Vulnerability Reports

Cerulean Studios Trillian UTF-8 Word Wrap Heap Overflow Vulnerability

06.18.07

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

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.

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.

DETECTION

iDefense has confirmed the existence of this vulnerability in Cerulean Studios Trillian 3.1.5.1. Previous versions are suspected to be vulnerable.

WORKAROUND

iDefense is currently unaware of any effective workaround for this issue.

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

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

05/04/2007 Initial vendor notification
05/04/2007 Initial vendor response
06/18/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by www.BlurredLogic.com.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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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.