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Category:   Application (Instant Messaging/IRC/Chat)  >   Trillian Vendors:   Cerulean Studios
Trillian IRC and Display Engine Heap Overflows Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017982
SecurityTracker URL:
CVE Reference:   CVE-2007-2478, CVE-2007-2479   (Links to External Site)
Updated:  May 12 2008
Original Entry Date:  Apr 30 2007
Impact:   Disclosure of user information, 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 cause arbitrary code to be executed on the target user's system.

A remote user can send a message containing an HTML font tag with a specially crafted 'face' attribute that 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 remote user can create a specially crafted URL that, when highlighted by the target user within Trillian, 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 remote system can send specially crafted CTCP PING messages containing UTF-8 characters to cause the target Trillian client to return some data to a remote user instead of the intended server.

The vendor was notified on January 24, 2007.

enhalos reported these vulnerabilities to iDefense.

Impact:   A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can obtain user information.

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

Date:  Mon, 30 Apr 2007 15:14:40 -0400
Subject:  iDefense Security Advisory 04.30.07: Cerulean Studios Trillian

Cerulean Studios Trillian Multiple IRC Vulnerabilities

iDefense Security Advisory 04.30.07
Apr 30, 2007


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.


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.


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.


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


iDefense is currently unaware of any effective workaround for this


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


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


01/24/2007  Initial vendor notification
01/30/2007  Initial vendor response
04/30/2007  Coordinated public disclosure


These vulnerabilities were reported to iDefense by enhalos.

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Copyright  2007 iDefense, Inc.

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