Tlen.pl, remote script execution

[Jaroslaw Sajko <sloik () man poznan pl>]

Product:        Tlen.pl (<= 5.23.4.1)
Vendor:         o2.pl Sp. z o.o. (http://www.tlen.pl/)
Impact:         Remote script execution
Severity:       High
Authors:        Blazej Miga <bla () man poznan pl>,
                Jaroslaw Sajko <sloik () man poznan pl>
Date:           20/12/04


[ISSUE]

Tlen.pl is the instant messenger application used by more than 700 000
users.
There is a vulnerability in message parsing which allows remote execution
of arbitrary script.


[DETAILS]

There is a parsing error. We can send a malicious string which has an url
inside. This url can be a javascript code for example. Code will execute
when the window with the message pops up.


[POF]

Send such a string to any receipent:
www.tlen.pl"style=background-image:url(javascript:alert(%22You%20are%20owned!%22));.pl


[SOLUTION]

Please upgrade to the newest version (5.23.4.2)


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