CMS Papoo 6.0.0 Rev. 4701 - Persistent Cross-Site Scripting

Advisory: Persistent XSS Vulnerability in CMS Papoo Light v6
Advisory ID: SROEADV-2014-01
Author: Steffen Rösemann
Affected Software: CMS Papoo Version 6.0.0 Rev. 4701
Vendor URL: http://www.papoo.de/
Vendor Status: fixed
CVE-ID: -

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Vulnerability Description:
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The CMS Papoo Light Version has a persistent XSS vulnerability in its guestbook functionality and in its user-registration functionality.

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Technical Details:
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XSS-Vulnerability #1:

Papoo Light CMS v6 provides the functionality to post comments on a guestbook via the following url: http://{target-url}/guestbook.php?menuid=6.

The input fields with the id „author“ is vulnerable to XSS which gets stored in the database and makes that vulnerability persistent.

Payload-Examples:

<img src='n' onerror=“javascript:alert('XSS')“ >
<iframe src=“some_remote_source“></iframe>

XSS-Vulnerability #2:

People can register themselves on Papoo Light v6 CMS at http://{target-url}/account.php?menuid=2. Instead of using a proper username, an attacker can inject HTML and/or JavaScriptcode on the username input-field.

Code gets written to the database backend then. Attacker only has to confirm his/her e-mail address to be able to login and spread the code by posting to the forum or the guestbook where the username is displayed.

Payload-Examples:

see above (XSS #1)

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Solution:
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Update to the latest version

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Disclosure Timeline:
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13-Dec-2014 – found XSS #1
13-Dec-2014 - informed the developers (XSS #1)
14-Dec-2014 – found XSS #2
14-Dec-2014 – informed the developers (XSS #2)
15-Dec-2014 - release date of this security advisory
15-Dec-2014 - response and fix by vendor
15-Dec-2014 - post on BugTraq

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Credits:
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Vulnerability found and advisory written by Steffen Rösemann.

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References:
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http://www.papoo.de/
http://sroesemann.blogspot.de