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[Full-disclosure] iDefense Security Advisory 04.30.07: Cerulean Studios Trillian Multiple IRC Vulnerabilities

From: iDefense Labs <labs-no-reply_at_nospam>
Date: Tue May 01 2007 - 14:56:54 GMT
To: vulnwatch@vulnwatch.org, full-disclosure@lists.grok.org.uk, bugtraq@securityfocus.com

Cerulean Studios Trillian Multiple IRC Vulnerabilities

iDefense Security Advisory 04.30.07
http://labs.idefense.com/intelligence/vulnerabilities/ Apr 30, 2007

I. BACKGROUND Cerulean Studios 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.


II. DESCRIPTION Remote exploitation of multiple vulnerabilities in the Internet Relay Chat (IRC) module of Cerulean Studios' Trillian could allow for the interception of private conversations or execution of code as the currently logged on user.

When handling long CTCP PING messages containing UTF-8 characters, it is possible to cause the Trillian IRC client to return a malformed response to the server. This malformed response is truncated and is missing the terminating newline character. This could allow the next line sent to the server to be improperly sent to an attacker.

When a user highlights a URL in an IRC message window Trillian copies the data to an internal buffer. If the URL contains a long string of UTF-8 characters, it is possible to overflow a heap based buffer corrupting memory in a way that could allow for code execution.

A heap overflow can be triggered remotely when the Trillian IRC module receives a message that contains a font face HTML tag with the face attribute set to a long UTF-8 string.

III. ANALYSIS Exploitation of this vulnerability allows remote attackers to intercept private communications for Trillian IRC users or execute code with the credentials of the currently logged on user.

In order to exploit the highlighted URL vulnerability, users would have to highlight the malicious URL.

IV. DETECTION iDefense has confirmed the existence of this vulnerability in Cerulean Studios Trillian 3.1.

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

VI. VENDOR RESPONSE Cerulean Studios has addressed these vulnerabilities within version of Trillian. For more information, visit their blog at the following URL.


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

VIII. DISCLOSURE TIMELINE 01/24/2007 Initial vendor notification 01/30/2007 Initial vendor response 04/30/2007 Coordinated public disclosure

IX. CREDIT These vulnerabilities were reported to iDefense by enhalos.

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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@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.

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