Public Vulnerability Reports

Cerulean Studios Trillian Multiple IRC Vulnerabilities



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 issue.


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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