TC-SA-2013-01: Reflected Cross-Site-Scripting (XSS) vulnerability 
in e107 CMS v1.0.2

Published: 2013/04/03
Version 1.0

Affected Products:
    e107 version 1.0.2 (others not tested)
    http://www.e107.org

References:
    TC-SA-2013-01 www.tele-consulting.com/advisories/TC-SA-2013-01.txt 
(used for updates)
    CVE-2013-2750 - Reflected Cross-Site-Scripting (XSS) vulnerability 
in e107 CMS v1.0.2

Summary:
    "e107 is a free (open-source) content management system allowing 
    you to easily manage and publish your content. Developers can 
    save time in building websites and powerful online applications.
    Users can avoid programming completely!" (www.e107.org) 
    The content_preset.php Script in e107 CMS is vulnerable to 
    reflected Cross-Site-Scripting (XSS) attacks. Malicious code is 
    not sanitized when using "%00" in conjuction with "%0d%0a" 
    within GET-Parameter.

Effect:
    Under certain circumstances it is possible that attackers may 
    inject arbitrary script code e. g. to steal authentication data. 

Vulnerable Scripts:
    /e107_plugins/content/handlers/content_preset.php

Examples:
    http://[host]/e107_plugins/content/handlers/content_preset.php?
%3c%00script%0d%0a>alert('reflexted%20XSS')</script>

Possible Solutions:
    Use e107 v1.0.3 (contains updated content_preset.php)

Affected products:
    e107 1.0.2 (older releases have not been tested)

Disclosure Timeline:
    2013/02/18 vendor contacted via email
    2013/02/18 initial response
    2013/03/04 proposed fix by vendor
    2013/03/08 second proposed fix by vendor
    2013/03/13 fix confirmed
    2013/03/14 vendor released update 1.0.3
    2013/04/03 Public disclosure

Credits
    Simon Bieber (sbieber@tele-consulting.com)
    Tele-Consulting security networking training GmbH
    www.tele-consulting.com
  
Disclaimer:
    All information is provided without warranty. The intent is to 
    provide information to secure infrastructure and/or systems, not
    to be able to attack or damage. Therefore Tele-Consulting shall 
    not be liable for any direct or indirect damages that might be 
    caused by using this information.