[NT] Remote Script Execution in Tlen.pl

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To: list@securiteam.com
Date: 27 Dec 2004 10:13:34 +0200

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  Remote Script Execution in Tlen.pl
------------------------------------------------------------------------

SUMMARY

 <http://www.tlen.vel.pl/> Tlen.pl is the instant messenger application. A
vulnerability in Tlen.pl's message parsing allows remote execution of
arbitrary script.

DETAILS

Vulnerable Systems:
 * Tlen.pl Version 5.23.4.1 and prior

Immune Systems:
 * Tlen.pl Version 5.23.4.2

A parsing error allow a malicious user to send a string which has an URL
inside. If the can include JavaScript code for example, the script code
will execute when the window with the message pops up.

Example:
Sending the following link to any recipient:
www.tlen.pl"style=background-image:url(javascript:alert(%22You%20are%20owned!%22));.pl

Will cause him to open a JavaScript message box in the client's machine
when he/she open the message window.

Vendor Status:
The vendor has released version 5.23.4.2 that addresses this issue.

ADDITIONAL INFORMATION

The information has been provided by <mailto:sloik@man.poznan.pl>
Jaroslaw Sajko.

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