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Category:   Application (Instant Messaging/IRC/Chat)  >   Trillian Vendors:   Cerulean Studios
Trillian Heap Overflow in Window Width Value Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018265
SecurityTracker URL:
CVE Reference:   CVE-2007-3305   (Links to External Site)
Updated:  May 11 2008
Original Entry Date:  Jun 18 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to
Description:   A vulnerability was reported in Trillian. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted UTF-8 encoded data that, when viewed by the target user, will trigger a heap overflow and execute arbitrary code on the target user's system. The code will run with the privileges of the target user.

A specially crafted window width value can trigger the overflow.

The vendor was notified on May 4, 2007. reported this vulnerability to iDefense.

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   The vendor has issued a fixed version (

The Cerulean advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 06.18.07: Cerulean Studios Trillian UTF-8

Cerulean Studios Trillian UTF-8 Word Wrap Heap Overflow Vulnerability

iDefense Security Advisory 06.18.07
Jun 18, 2007


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.


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.


Exploitation of this vulnerability could allow remote attackers to
execute arbitrary code with the credentials of the currently logged on

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


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


iDefense is currently unaware of any effective workaround for this


The Cerulean Studios team has addressed this vulnerability by releasing
version of Trillian. More information is available at the
Cerulean Studios Blog via the following URL.


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


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


This vulnerability was reported to iDefense by

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